ISO/IEC 13962:1995

INTERNATIONAL ISOIIEC
STANDARD
First edition
1995-09-15
Information technology - Data
interchange on 12,7 mm, 112~track
magnetic tape cartridges - DLT 2 format
Technologies de I’informa tion - khange de donnees SW cartouches de
bande magn&ique de 12,7 mm, 112 pistes - Format DLT 2

ISOLIEC 13962: 1995 (E)
Contents
Page
1 Scope
2 Conformance
2.1 Magnetit tape cartridges
2.2 Generating Systems
2.3 Receiving Systems
3 Normative references
4 Definitions
4.1 Average Signal Amplitude
4.2 azimuth
4.3 back surface
4.4 Beginning-Of-Tape marker (BOT)
4.5 byte
4.6 cartridge
4.7 Cyclic Redundancy Check (CRC) Character
4.8 Early Wart-ring (EW)
4.9 Error-Detecting Code (EDC)
4.10 End-Of-Tape marker (EOT)
4.11 Entity
4.12 Error-Correcting Code (ECC)
4.13 flux transition Position
4.14 flux transition spacing
4.15 Logical Block
4.16 logical track
4.17 magnetic tape
4.18 Master Standard Reference Tape
4.19 Object
4.20 physical block
4.21 physical recording density
4.22 physical track
4.23 Record
4.24 Reference Edge
4.25 Reference Field
4.26 Secondary Standard Reference Tape
@ ISO/IEC 1995
All rights reserved. Unless otherwise specified no part of this publication may be
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ISO/IEC Copyright Office l Case Postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
ISO/IEC 13692:1995 (E)
OISO/IEC
4.27 Standard Reference Amplitude (SRA)
4.28 Standard Reference Current
4.29 Test Recording Current
4.30 Typical Field
5 Conventions and notations
5.1 Representation of numbers
5.2 Names
5.3 Acronyms
6 Environment and safety
6.1 Cartridge and tape testing environment
6.2 Cartridge operating environment
6.3 Cartridge storage environment
6.4 Safety
6.4.1 Safeness
6.4.2 Flammability
6.5 Transportation
Section 2 - Requirements for the unrecorded tape
7 Mechanical and electrical requirements
7.1 Material
7.2 Tape length
7.3 Width
7.4 Total thickness
7.5 Thickness of the base material
7.6 Thickness of the magnetic coating
7.7 Thickness of the back coating
7.8 Discontinuity
7.9 Longitudinal curvature
7.9.1 Requirement
7.9.2 Procedure
7.10 Out-of-Plane distortions
7.11 Cupping
7.12 Roughness of the coating surfaces
7.12.1 Roughness of the back coating surface
7.12.2 Roughness of the magnetic coating surface
7.13 Coating adhesion
7.14 Layer-to-layer adhesion
7.14.1 Requirements
7.14.2 Procedure
7.15 Modulus of elasticity
7.15.1 Requirement
7.15.2 Procedure
7.16 Flexural rigidity
. . .
OISOIIEC
ISO/IEC 13962: 1995 (E)
7.16.1 Requirement
7.16.2 Procedure
7.17 Tensile yield forte
7.17.1 Procedure
7.18 Electrical resistance
7.18.1 Requirement
7.18.2 Procedure
7.19 Inhibitor tape
7.20 Abrasivity
7.20.1 Requirement
7.20.2 Procedure
7.21 Light transmittance of the tape and the leader
7.22 Coefficient of dynamic friction
7.22.1 Requirements
7.22.2 Procedure for the measurement of the friction between the magnetic surface and the back surface
7.22.3 Procedure for the measurement of the friction between the magnetic surface or the back surface and Calcium
titanate ceramic
8 Magnetit recording characteristics
8.1 Typical Field
8.2 Signal amplitude
8.3 Resolution
8.4 Overwrite
8.4.1 Requirement
8.5 Peak shift
8.5.1 Requirement
8.5.2 Procedure
9 Tape quality
9.1 Missing pulses
9.1.1 Requirement
9.2 Missing pulse zone
9.2.1 Requirement
9.3 Tape durability
Section 3 - Mechanical specifications of the tape cartridge
10 General
10.1 Bottom side and right side
10.2 Back side and left side
10.3 Tape reel
10.4 Tape leader
10.5 Front side
10.6 Operation of the cartridge
10.7 Tape winding
1v
ISO/IEC 13692:1995 (E)
OISOIIEC
10.8 Moment of inertia
10.9 Material
Section 4 - Requirements for an interchanged tape
11 Method of recording
11.1 Physical recording density
11.2 Bit cell length
11.2.1 Average bit cell length
11.2.2 Long-term average bit cell length
11.2.3 Short-term average bit cell length
11.3 Flux transition spacing
11.4 Read Signal amplitude
11.5 Azimuth
11.6 Channel skew
12 Tape format
12.1 Reference Edge
12.2 Direction of recording
12.3 Tape layout
12.4 Calibration and Directory Area
12.4.1 Scratch Area
12.4.2 Guard Area Gl
12.4.3 Calibration Tracks Area
12.4.4 Guard Area G2
12.4.5 Directory Area
12.4.6 Guard Area G3
12.5 Data Area
12.5.1 Physical tracks
12.5.2 Width of the physical tracks
12.5.3 Logical tracks
12.5.4 Locations of the physical tracks
12.5.5 Layout of tracks in the Data Area
13 Data format
13.1 Data Bytes
13.2 Logical Blocks
13.3 Data Blocks
13.4 Types of Logical Blocks
13.5 Entities
13.6 Logical Block format
13.6.1 Preamble
13.6.2 Sync
13.6.3 Data Field
13.6.4 Control Field 1 (CF1 )
13.6.5 Control Field 2 (CF2)
13.6.6 CRC
13.6.7 Postamble
V
OISO/IEC
ISO/IEC 13962: 1995 (E)
14 Use of Logical Blocks
14.1 Data Blocks
14.2 Tape Mark Blocks
14.3 Filler Blocks
14.4 End of Track Blocks (EOTR)
14.5 End of Data Blocks (EOD)
14.6 ECC Blocks
15 Format of Entities
16 Error handling
Annexes
A - Measurement of light transmittance
B - CRC generation
C - ECC generation
D - Format of Control Field 1
E - Format of Control Field 2
F - Recommendations for transportation
G - Inhibitor tape
H - Recommendations on tape durability
J - Handling guidelines
OISO/IEC
ISO/IEC 13692:1995 (E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the
specialized System for worldwide standardization. National bodies that are members of ISO or IEC participate in the
development of International Standards through technical committees established by the respective organization to deal with
particular fields of technical activity. ISO and IEC technical committees collaborate in Felds of mutual interest. Other
international organizations, governmental and non-govemmental, in liaison with ISO and IEC, also take part in the work.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft
International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the national bodies casting a vote.
International Standard ISO/IEC 13962 was prepared by ECMA (as Standard ECMA-197) and was adopted, under a special
“fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology.
Annexes A to E form an integral part of this International Standard. Annexes F to J are for information only.
vii
ISO/IEC 13962: 1995 (E)
OISO/IEC
Introduction
ISO/IEC 13421 l) specifies a magnetic tape cartridge in which the 12,7 mm wide magnetic tape is recorded on 48 parallel
physical tracks, recorded and read in pairs, which constitute two groups, the first recorded and read in forward direction, the
second in reverse direction.
This International Standard constitutes a further development of the cartridge specified in ISO/IEC 13421 in that the number
of tracks has been raised from 48 to 112, thus raising the total capacity of the cartridge accordingly. Drives for cartridges
according to this International Standard may be able to read from, and write onto, cartridges according to ISO/IEC 13421.
l) ISOIIEC 13421.1993 . Information technology - Data interchange on 12,7 mm, 48-track magnetic tape cartridges - DLTI
format.
. . .
Vlll
INTERNATIONAL STANDARD @ISO/IEC
ISOIIEC 13962:1995 (E)
Information technology - Data interchange on 12,7 mm, 112~track magnetic tape
cartridges - DLT 2 format
Section 1 - General
Scope
This International Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, 112-track magnetic tape
cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded Signals, a format - called
Digital Linear Tape 2 (DLT 2) - and a recording method. Together with a labelling Standard, e.g. ISO 1001, it allows full data
interchange by means of such magnetic tape cartridges.
2 Conformance
21 0 Magnetit tape cartridges
A magnetic tape cartridge shall be in conformance with this International Standard if it satisfies all mandatory requirements of
this International Standard. The tape requirements shall be satisfied throughout the extent of the tape.
22 . Generating Systems
A System generating a magnetic tape cartridge for interchange shall be entitled to Claim conformance with this International
Standard if all the recordings that it makes on a tape according to 2.1 meet the mandatory requirements of this International
Standard.
23 . Receiving Systems
A System receiving a magnetic tape cartridge for interchange shall be entitled to Claim conformance with this International
Standard if it is able to handle any recording made on a tape according to 2.1.
3 Normative references
The following Standards contain provisions which, through reference in this text, constitute provisions of this International
Standard. At the time of publication, the editions indicated were valid. All Standards are subject to revision, and Parties to
agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent
editions of the Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 1001: 1986, Information processing - File structure and labelling of magnetic tapes for information interchange.
ISO 1302: 1992, Technical drawings - Method of indicating sur$ace texture.
4 Definitions
For the purpose of this International Standard, the following definitions apply.
41 0 Average Signal Amplitude: The average peak-to-peak value of the output Signal from the read head at the
physical recording density of 1 674 ftpmm measured over a minimum length of track of 25,4 mm, exclusive of missing pulses.
42 . azimuth: The angular deviation, in minutes of arc, of the mean flux transition line of the recording made on a track
from the line normal to the Reference Edge.
43 . back surface: The surface of the tape opposite the magnetic coating which is used to record data.
44 . Beginning-Of-Tape marker (BOT): A hole punched on the centreline of the tape towards the end nearest to the
leader.
45 . byte: An ordered set of bits acted upon as a unit.
Note 1 - In this International Standard, all bytes are 8-bit bytes.

ISO/IEC 13962: 1995 (E) OISO/IEC
46 . cartridge: A case containing a Single supply reel of 12,7 mm wide magnetic tape with a leader attached at the outer
end.
Character: A 64-bit Character, generated by a mathematical computation,
47 . Cvclic Redundancv Check (CRC)
d
used for error detection.
generated by the drive indicating the approaching end of the recording area.
48 . Early Warning (EW): A Signal
49 0 Error-Detecting Code (EDC): A mathematical computation yielding check bytes used for error detection.
A hole punched on the centreline of the tape towards the end farthest from the
4.10 End-Of-Tape marker (EOT):
leader.
4.11 Entity: A group of ten Logical Blocks treated as a logical unit and recorded on a logical track.
4.12 Error-Correcting Code (ECC): A mathematical computation yielding check bytes used for the correction of
errors detected by the CRC and the EDC.
4.13 flux transition Position: The Point which exhibits the maximum free-space flux density normal to the tape
surface.
4.14 flux transition spacing: The distance on the magnetic tape between successive flux transitions.
4.15 Logical Block: The two physical blocks simultaneously written on, or read from, the two physical tracks of a
logical track.
4.16 logical track: A pair of physical tracks that are written or read simultaneously.
4.17 magnetic tape: A tape that accepts and retains magnetic Signals intended for input, output, and storage purposes on
Computers and associated equipment.
4.18 Master Standard Reference Tape: A tape selected as the Standard for reference field, Signal amplitude,
resolution, peakshift, and overwrite characteristics.
Note 2 - The Master Standard Reference Tape is maintained by the Quantum Corporation.
4.19 Object: A Record or a Tape Mark Block.
4.20 physical block: A set of contiguous bytes recorded on a physical track and considered as a unit.
4.21 physical recording density: The number of recorded flux transitions per unit length of track, expressed in flux
transitions per millimetre (ftpmm).
4.22 physical track: A longitudinal area on the tape along which a series of magnetic Signals tan be recorded.
4.23 Record: A collection of User Bytes, the number of which is determined by the host.
4.24 Reference Edge: The bottom edge of the tape when viewing the magnetic coating of the tape with the BOT to the
left and the EOT to the right of the observer.
4.25 Reference Field: The Typical Field of the Master Standard Reference Tape.
4.26 Secondary Standard Reference Tape : A tape the characteristics of which are known and stated in relation to
those of the Master Standard Reference Tape.
334 South
Note 3 - Secondary Standard Reference Tapes tan be ordered under Reference “SSRT/DLTl” until the year 2003 from Quantum Corporation,
Street, Shrewsbury, Mass. 01545, USA.
It is intended that these be used for calibrating tertiary reference tapes for routine calibration.
4.27 Standard Reference Amplitude (SRA): The A verage Signal Amplitude from the Master Standard Reference
Tape when it is recorded with the Test Recording Current at 1 674 ftpmm.
4.28 Standard Reference Current: The current that produces the Reference Field.
OISO/IEC ISO/IEC 13962: 1995 (E)
4.29 Test Recording Current: The current that is 1 ,l times the Standard Reference Current.
4.30 Typical Field: In the plot of the Average Signal Amplitude against the recording field at the physical recording
density of 1674 ftpmm, the minimum field that Causes an Average Signal Amplitude equal to 95 % of the maximum Average
Signal Amplitude.
5 Conventions and notations
51 0 Representation of numbers
The following conventions and notations apply in this International Standard, unless otherwise stated.
- In each block and in each field the bytes shall be arranged with Byte 1, the least significant, first. Within each byte the bits
shall be arranged with Bit 1, the least significant, first and Bit 8, the most significant bit, last. This Order applies to the data,
and to the input and output of the error-detecting and error-correcting Codes, and to the cyclic redundancy characters.
- Letters and digits in parentheses represent numbers in hexadecimal notation.
- The setting of bits is denoted by ZERO or ONE.
- Numbers in binary notation and bit Patterns are represented by strings of ZEROS and ONEs shown with the most
significant bit to the left.
52 l Names
fields, are written with a capital initial letter.
The names of basic elements, e.g. specific
53 . Acronyms
BOT Beginning of Tape
CF1 Control Field 1
CF2 Control Field 2
CRC Cyclic Redundancy Check (Character)
ECC Error-Correcting Code
EDC Error-Detecting Code
End of Data
EOD
EOT End of Tape
EOTR End of Track
EW Early Warning
FCTl Forward Calibration Track 1
FCT2 Forward Calibration Track 2
LEOT Logical End of Track
MFM Modified Frequency Modulation
RCTl Reverse Calibration Track 1
RCT2 Reverse Calibration Track 2
SRA Standard Reference Amplitude
6 Environment and safety
Computer room and not to
Unless otherwise stated, the conditions specified below refer to the ambient conditions in the test or
those within the tape drive.
61 . Cartridge and tape testing environment
requirements of this International
stated, tests and measurements made on the cartridge and tape to check the
Unless otherwise
Standard shall be carried out under the following conditions:
23 “C + 2 “C
- temperature:
-
relative humidity: 40 % to 60 %
-
conditioning before testing: 24 h

ISO/IEC 13962: 1995 (E) OISOIIEC
62 . Cartridge operating environment
Cartridges used for data interchange shall be capable of operating under the following conditions:
- temperature: 10 “C to 40 “C
-
relative humidity: 20 % to 80 %
-
wet bulb temperature: 25 “C max.
Note 4 - Localized tape temperatures in excess of 49 “C may Cause tape darnage.
If during storage andlor transportation a cartridge has been exposed to conditions outside the above values, it shall be
conditioned before use by exposure to the operating environment for a time equal to, or greater than, the time away from the
operating environment up to a maximum of 2 h. There shall be no deposit of moisture on or in the cartridge.
63 . Cartridge storage environment
Cartridges shall be stored under the following conditions:
- temperature: 16 “C to 32 “C
-
relative humidity: 20 % to 80 %
-
wet bulb temperature: 26 “C max.
Tapes intended for archiving data for one year or more shall be stored under the following conditions:
- temperature:
18”Cto26”C
-
relative humidity: 20 % to 60 %
The stray magnetic field at any Point on the tape shall not exceed 4000 A/m. There shall be no deposit of moisture on or in the
cartridge.
. Safety
6.4.1 Safeness
The cartridge and its components shall not constitute any safety or health hazard when used in the intended manner, or through
foreseeable misuse in an information processing System.
anY
Flammability
6.4.2
The cartridge and its components shall be made from materials which, if ignited from a match flame, and when so ignited do
not continue to bum in a still carbon dioxide atmosphere.
6.5 Transportation
for the environment in which cartridges should be transported. Annex
This International Standard does not specify Parameters
F gives some recommendations for transportation.
OISO/IEC ISO/IEC 13962:1995 (E)
Section 2 - Requirements for the unrecorded tape
7 Mechanical and electrical requirements
71 l Material
The tape shall consist of a base material (oriented polyethylene terephthalate film or its equivalent) coated on one surface with
a strong yet flexible layer of ferromagnetic material dispersed in a suitable binder. The other surface of the cartridge shall be
coated with a non-ferromagnetic conductive coating.
72 . Tape length
The length of the tape shall be 355 m minimum and 365 m maximum.
73 . Width
The width of the tape shall be 12,649 mm t 0,010 mm.
The width shall be measured across the tape from edge to edge when the tape is under a tension of less than 0,28 N.
74 . Total thickness
The total thickness of the tape at any Point shall be between 12,0 Pm and 14,0 km.
75 . Thickness of the base material
The thickness of the base material shall be between 9,0 Pm and 11 ,O Fm.
76 . Thickness of the magnetic coating
The thickness of the magnetic coating shall be between 2,0 Pm and 3,0 Pm.
77 . Thickness of the back coating
The thickness of the back coating shall be between 0,4 Pm and 0,9 Pm.
78 l Discontinuity
There shall be no discontinuities in the tape between the BOT and EOT such as those produced by tape splicing or
perforations.
.
79 . Longitudinal curvature
The longitudinal curvature is measured as the departure of the Reference Edge of the tape from a straight line along the
longitudinal dimension of the tape in the plane of the tape surface.
7.9.1 Requirement
Any deviation of the Reference Edge from a straight line shall be continuous and shall not exceed 0,038 mm within any 229
mm length of tape.
Procedure
7.9.2
Measure at a tension of 1,39 N t 0,28 N in a test fixture equipped with two guides spaced at 229 mm. The two guides shall be
spring-loaded to Position the Reference Edge of the tape against two edge control surfaces. Measure the maximum deviation
of the Reference Edge of the tape from the line drawn between the two control surfaces.
7.10 Out-of-Plane distortions
All visual evidente of out-of-plane distortion shall be removed when the tape is subjected to a uniform tension of 0,6 N. Out-
of-plane distortions are local deformations which Cause portions of the tape to deviate from the plane of the surface of the tape.
Out-of-plane distortions are most readily observed when the tape is lying on a flat surface under no tension.
7.11 Cupping
The departure across the width of the tape from a flat surface shall not exceed 0,76 mm.

ISO/IEC 13962: 1995 (E) OISO/IEC
Cut a 1 ,O m t 0,l m length of tape. Condition it for a minimum of 3 hours in the test environment by hanging it so that both
surfaces are freely exposed to the test environment. From the centre Portion of the conditioned tape tut a test piece of
approximately 25 mm length. Stand the test piece on its end in a cylinder which is at least 25 mm high with an inside diameter
of 13,O mm t 0,2 mm. With the cylinder standing on an Optical comparator measure the cupping by aligning the edges of the
test piece to the reticle and determining the distance from the aligned edges to the corresponding surface of the test piece at its
centre.
7.12 Roughness of the coating surfaces
7.12.1 Roughness of the back coating surface
The back coating surface shall have an arithmetic average roughness Ra between 0,005 Pm and 0,025 Fm (ISO 1302:N 2).
This measurement shall be made using a contacting stylus of radius 12,5 Pm with a 20 mg load, and a 254 p cutoff range.
7.12.2 Roughness of the magnetic coating surface
The magnetic coating surface shall have an arithmetic average roughness Ra between 0,005 0 Pm and 0,012 5 Fm (ISO 1302:
N 3). For this measurement, the contacting stylus radius shall be 12,5 Fm with a 20 mg load, and a 254 Fm cutoff range.
7.13 Coating adhesion
The forte required to peel any part of the coating from the tape base material shall not be less than 0,2 N.
Procedure
i. Take a test piece of the tape approximately 380 mm long and scribe a line through the recording coating across the width
of the tape 125 mm from one end.
ii. Using a double-sided pressure sensitive tape, attach the full width of the test piece to a smooth metal plate, with the
magnetic coating (recording surface) facing the plate, as shown in figure 1.
iii. Fold the test piece over 180”, attach the metal plate and the free end of the test piece to the jaws of a universal testing
machine and set the Speed of the jaw Separation to 254 mm per min.
iv. Note the forte at which any part of the coating first separates from the base material. If this is less than 0,2 N, the test has
failed. If the test piece peels away from the double-sided pressure sensitive tape before the forte exceeds 0,2 N, an
alternative type of double-sided pressure sensitive tape shall be used.
v. Repeat i) to iv) for the back coating.
Recording surface Scribed line
Pressure-sensitive tape
------+
4------ 125 mm I
93-01204
Figure 1 - Measurement of the coating adhesion
ISOiIEC 13962:1995 (E)
OISO/IEC
7.14 Layer-to-layer adhesion
Layer-to-layer adhesion refers to the tendency of a layer, when held in close proximity to the adjacent layer, to bond itself to
an adjacent layer so that free and smooth Separation of the layers is difficult.
7.14.1 Requirements
There shall be no evidente of delamination or other darnage to the coatings.
7.14.2 Procedure
i. Fasten one end of a 914 mm length of tape, magnetic coating inwards, to a horizontally mounted stainless steel cylinder
with a low cold-flow adhesive material.
ii. The dimensions of the cylinder shall be:
- diameter: 12,7 mm
- length: 102 mm
iii. Attach a mass of 1 000 g to the opposite end of the tape.
iv. Attach, 254 mm above the mass, a narrow strip of double-sided adhesive tape to the magnetic coating.
v. Slowly rotate the cylinder, so that the tape Winds uniformly around it into a compact and even roll. The double-sided tape
secures the end and prevents unwinding when the mass is removed.
vi. The cylinder with the tape shall then be exposed to the following temperature and humidity cycle:
Time Temperature RH
85 %
16hto18h 54 “C
10 % or less
4h 54 “C
21 “C 45 %
1 hto2h
vii. Open the end of the roll and remove the double-sided adhesive tape.
viii.Release the free end of the tape.
ix. The outer one or two wraps shall spring loose without adhesion.
x. Hold the free end of the tape and allow the cylinder to fall, thereby unwinding the tape.
xi. The tape shall show no coating delamination, except for the 5 1 mm of tape nearest to the cylinder.

ISO/IEC 13962: 1995 (E) OISO/IEC
94-0085A
1000 g
Figure 2 - Measurement of layer-to-layer adhesion
7.15 Modulus of elasticity
The modulus of elasticity (Young’s modulus) is the ratio of stress to strain in the longitudinal direction.
7.151 Requirement
The modulus of elasticity shall be between 5 500 N/mm2 and 8 500 N/mm2.
7.152 Procedure
Clamp a test piece of tape at least 178 mm in length with an initial 102 mm Separation between the jaws of a universal testing
machine with a nominal crosshead Speed of 3 mm per minute. Calculate the modulus using the chord of the curve between the
forte at 0 % and 1 % elongation.
Flexural rigidity
7.16
Flexural rigidity is the ability of the tape to resist bending in the longitudinal direction.
7.16.1 Requirement
The flexural rigidity of the tape in the longitudinal direction shall be between 0,5 x 10W3 N - mm and 2,9 x 1 OV3 N - mm.
Procedure
7.16.2
Calculate the flexural rigidity D from the following
equation:
Ext3
--
-
D x (l-v2)
where:
E = modulus of elasticity obtained from 7.15
= measured thickness of the tape in mm
V = Poisson’s ratio, set to 0,33

OISOIIEC ISO/IEC 13962: 1995 (E)
Tensile yield forte
7.17
The tensile yield forte required to elongate the test piece by 3 % shall not be less than 14,7 N.
7.17.1 Procedure
Use a static-weighing-constant-rate-of-grip Separation tester capable of indicating the load with an accuracy of 2 %. Clamp a
test piece of tape at least 178 mm long with an initial 102 mm Separation between the jaws. Elongate the test piece at a rate of
5 1 mm per minute until a minimum elongation of 10 % is reached. The forte required to produce an elongation of 3 % is the
tensile yield forte.
7.18 Electrical resistance
7.18.1 Requirement
The electrical resistance of any Square area of the magnetic coating shall
- be greater than 50 x 106 $92
- notexceed50x 1012R
The electrical resistance of any Square area of the back coating shall
- not exceed 100 x 106 Q
7.18.2 Procedure
Condition a test piece of tape in the test environment for 24 h. Position the test piece over two 24-carat gold-plated, semi-
circular electrodes having a radius Y = 25,4 mm and a finish of at least N4, so that the recording surface is in contact with each
electrode. These electrodes shall be placed parallel to the ground and parallel to each other at a distance d = 12,7 mm between
their centres. Apply a forte F of 1,62 N to each end of the test piece. Apply a d.c. voltage of 100 V t 10 V across the
current flow. From this value, determine the electical resistance.
electrodes and measure the resulting
Repeat for a total of 5 positions along the test piece and average the 5 resistance readings. For the back coating repeat the
procedure with the back surface in contact with the electrodes.
F F
9%0122-A
Figure 3 - Measurement of electrical resistance
When mounting the test piece, make sure that no conducting paths exist between the electrodes except that through the coating
under test.
Note 5 - Particular attention should be given to keeping the surf’aces clean.

ISO/IEC 13962: 1995 (E) OISO/IEC
7.~9 Inhibitor tape
This International Standard does not specify Parameters for assessing whether or not a tape is an inhibitor tape. However,
annex G gives further information on inhibitor tapes.
7.20 Abrasivity
Tape abrasivity is the tendency of the magnetic coating to wear the magnetic heads.
7.20.1 Requirement
The depth of the wear Pattern in a ferrite wear bar shall be less than 1,27 um.
7.20.2 Procedure
A test piece 61 m in length shall be passed for 100 Passes (50 cycles) over a rectangular bar of manganese zinc ferrite. The bar
shall be 0,3 mm wide and its top surface shall be rounded off with a radius r. = 5 mm. The tape Speed shall be 2,54 m/s, the
tension shall be nominally 1,3 N and the wrap angle shall be 12”. The wear depth is measured with a profilometer across the
width of the tape path.
Note 6 - Manganese zinc ferrite should be available from Philips Ceramic Division in Saugerties (NY) under Order part number 3H7.
Figure 4 - Measurement of abrasivity (not to scale)
7.21 Light transmittance of the tape and the leader
The light transmittance of the tape and the leader shall be less than 5 % when measured according to the method specified in
annex A.
7.22 Coefficient of dynamic friction
The coefficient of dynamic friction is measured between the surfaces of the tape, and Calcium titanate ceramic.
Requirements
7.22.1
greater than 0,20
Between the magnetic surface and the back surface :
Between the magnetic surface and other surfaces: 0,lO to 0,40
OISO/IEC ISO/IEC 13962: 1995 (E)
Between the back surface and Calcium titanate: 0,lO to 0,25
7.22.2 Procedure for the measurement of the friction between the magnetic surface and the back surface
i. Wrap a first piece of tape around a Calcium titanate ceramic cylinder (Ra = 0,05 Pm) of diameter 25,4 mm and wrap it with
a total wrap angle of more than 90” with the back surface outwards.
ii. Wrap surface inwards, around the first test piece with a total wrap angle of 90”.
a second test piece, with the magnetic
. . .
111. Exert on one end of the outer test piece a forte of 0,54 N.
iv. Attach the other end to a forte gauge mounted on a linear slide.
V. Drive the slide at a Speed of 1 mm/s.
vi. Connect the forte gauge to a Plotter to record the results.
7.22.3 Procedure for the measurement of the friction between the magnetic surface or the back surface and
Calcium titanate ceramic
i. Wrap a piece of tape around a Calcium titanate ceramic cylinder (Ra = 0,05 Fm) of diameter 25,4 mm and wrap it with a
total wrap angle of 90” with the magnetic surface or the back surface, as appropriate, inwards.
ii. Exert on one end of the test piece a forte of 0,54 N.
iii. Attach the other end to a forte gauge mounted on a linear slide.
iv. Drive the slide at a Speed of 1 mm/s.
v. Connect the forte gauge to a Plotter to record the results.
Note 7 - Calcium titanate ceramic should be available from Philips Ceramic Division in Saugerties (NY) under Order part Ca Ti.
8 Magnetit recording characteristics
The magnetic recording characteristics shall be defined by testing the requirements given below.
When performing the tests, the output or resultant Signal shall be measured on the same relative pass for both a tape calibrated
to the Master Standard Reference Tape and the tape under test (read-while-write, or on equipment without read-while-write
capability, on the first forward-read-pass) on the same equipment.
The following conditions shall apply to the testing of all magnetic recording characteristics, unless otherwise noted.
- Tape condition: a.c. erased to 2 % or less of the Average Signal Amplitude
- Tape Speed: 2,54 mls
- Read track: within the written track
- Gap alignment: within 5’ between the mean write transitions and the read gap
- Write gap length: 2,0 pm * 0,3 Fm
- Write gap width: 0,216 mm t 0,010 mm
0,36 Pm & 0,lO Pm
- Read gap length:
- Read gap width: 0,051 mm t, 0,010 mm
- Tape tension: 1,14 N t 0,14 N
- Recording current: Test Recording Current
- Physical recording densities: 2f= 1674 ftpmm + 33 ftpmm, corresponding to 2,126 MHz & 2 %
lf= 837 ftpmm + 16 ftpmm, corresponding to 1,063 MHz tr 2 %
- Bandwidth of the read
amplifier: 3,2 MHz
81 . Typical Field
The Typical Field shall be between 75 % and 125 % of the Reference Field.
ISO/IEC 13962: 1995 (E) OISO/IEC
Traceability to the Reference Field is provided by the calibration factors supplied with each Secondary Standard Reference
Tape.
82 0 Signal amplitude
The Average Signal Amplitude shall be between 85 % and 115 % of the SRA.
Traceability to the SRA is provided by the calibration factors supplied with each Secondary Standard Reference Tape.
83 . Resolution
The ratio of the average Signal amplitude at the physical recording density of 1 674 ftpmm to that at the physical recording
density of 837 ftpmm shall be between 90 % and 120 % of the same ratio for the Master Standard Reference Tape.
Traceability to the resolution of the Master Standard Reference Tape is provided by the calibration factors supplied with each
Secondary Standard Reference Tape.
Overwrite
84 .
being
Overwrite is the ratio of the residual Signal of the average Signal amplitude recorded at 837 ftpmm after overwritten at 1
of the 837 ftpmm Signal.
674 ftpmm to the average Signal amplitude
8.4.1 Requirement
The overwrite for the tape shall be less than 110 % of the overwrite for the Master Standard Reference Tape.
Traceability to the overwrite of the Master Standard Reference Tape is provided by the calibration factors supplied with each
Secondary Standard Reference Tape.
. Peak shift
Peak shift is measured as the time displacement from nominal of the ONEs transitions in the MFM-recorded Pattern
1101101 lO.
8.5.1 Requirement
For a peak shift ratio of n % of the Master Standard Reference Tape, the measured peak shift ratio shall be between (n-2) %
and (n+2) %.
Traceability to the peak shift ratio of the Master Standard Reference Tape is provided by the calibration factors supplied with
each Secondary Standard Reference Tape.
8.5.2 Procedure
The time interval measurements shall be averaged over 250 ONE-ONE-ZERO Patterns taken at a sampling rate of 96 times 2J
The time between adjacent peaks in the ONE-ONE interval is denoted as tl. The time between the last ONE in the ONE-ONE
interval to the last ONE in the following ONE-ONE interval is denoted as to.
3t, -f,
Peak shift = 2t x 100%
ISODEC 13962: 1995 (E)
OISO/IEC
1 0
0 1 1 0 1
/
/
/ /
l / /
l l
/
--
t
t
94-00@7-A
Figure 5 - Measurement of peak shift
9 Tape quality
Missing pulses
91 0
A missing pulse is a loss of read Signal amplitude. A missing pulse exists when the base-to-peak read Signal amplitude is less
than 35 % half of the Average Signal Amplitude for the preceding 25,4 mm of tape.
9.1.1 Requirement
The average missing pulse rate shall be less than 20 missing pulses for any recorded length of track of 100 m.
92 . Missing pulse zone
A missing pulse zone is a sequence of missing pulses exceeding 100 mm.
9.2.1 Requirement
Missing pulse zones shall not occur.
93 0 Tape durability
This International Standard does not specify Parameters for assessing tape durability. However, a recommended procedure is
described in annex H.
ISO/IEC 13962: 1995 (E) OISO/IEC
Section 3 - Mechanical specif’ications of the tape cartridge
10 General
The tape cartridge shall consist of the following elements
- a case
-
a reel for the magnetic tape
-
a locking mechanism for the reel
-
a magnetic tape wound on the hub of the reel
-
a write-inhibit mechanism
-
a tape leader
Dimensional characteristics are specified for those Parameters deemed mandatory for interchange and compatible use of the
cartridge. Where there is freedom of design, only the fimctional characteristics of the elements described are indicated.
Where they are purely descriptive the dimensions are referred to three reference planes A, B, and C forming a geometrical
trihedral. Where the dimensions are related to the Position of the cartridge in the drive, they may be referenced to another
surface of the cartridge.
In the enclosed drawings a typical implementation is represented in third angle projection.
Figure 6 Shows a general view of the cartridge.
Figure 7 Shows the reference planes A, B, C.
Figure 8 Shows the bottom side of the cartridge.
Figure 9 Shows the right side of the cartridge.
Figure 10 Shows the back side of the cartridge.
Figure 11 Shows the left side of the cartridge.
Figure 12
Shows a partial Cross-section of the cartridge in locked Position.
Figure 13 Shows a partial Cross-section of the cartridge in operating Position.
Figure 14 Shows the leader-to-tape connection.
Figure 15 Shows the splice of the leader-to-tape connection.
Figure 16 Shows the leader.
Figure 17 Shows the front side of the cartridge.
Figure 18 Shows the back side of the cartridge with partial tut.
Figure 19 Shows the top side of the cartridge with partial tut and the door open.
Figure 6 Shows a general view of the cartridge. When it is not in the operating Position, the reel of magnetic tape is locked and
cannot rotate. When loaded into the drive, the back side is introduced first and the front side remains visible during Operation.
During the loading process the tape reel is unlocked and the Position of the cartridge within the drive is fixed by elements of
the drive engaging with corresponding elements of the case.
plane A,
The Position of the case relative to the reference planes A, B and C is shown in figure 7. The top side lies in reference
the right side lies in reference plane B and the back side lies in reference plane C.
10.1 Bottom side and right side (figures 8 and 9)
The Overall dimensions of the cartridge shall be
e, = 10579 mm & 0,20 mm
t2 = 105,41 mm + 0,20 mm
t3 = 2540 mm $r 0,25 mm
The bottom side shall have a window the dimensions and the Position of which shall be defined by
e4 = 6,25 mm + 0,lO mm
OISO/IEC ISO/IEC 13962: 1995 (E)
!, = 485 mm + 0,05 mm
JT6 = 84,07 mm + 0,20 mm
t7 = 3,81 mm Ifr 0,05 mm
This window allows one of the fingers of the drive to penetrate into the case for partially unlocking the reel of tape (see 10.6).
A positioning hole on the bottom side and a guiding notch, followed by a positioning notch in the right side determine the
Position of the cartridge in the drive.
The dimensions and the Position of the positioning hole shall be defined by
= 21,59 mm + 0,lO mm
e,
+ 0,13 mm
l9 = 4,45 mm
- 0,OO mm
Cl0 = 2,79 mm Zl 0,05 mm
t, 1 = 44,58 mm + 0,20 mm
The dimensions and the Position of the positioning notch shall be defined by
112 = 5,56 mm + 0,lO mm
kj3 = 33,30 mm + 0,20 mm
114 = 5,08 mm & 0,lO mm
h, = 9,02 mm & 0,lO mm
A, = 14OIf:30’
The dimensions and the Position of the guiding notch shall be defined by
e,, = 8,59 mm + 0,lO mm
t16 = 24,64 mm + 0,lO mm
t17 = 1,50 mm + 0,05 mm
A,=45"+30'
A, = 14O + 30’
The right side shall have an indicator connected to the manually operable write-inhibit switch described in 10.5. The
dimensions and the Position of this indicator shall be defined by
118 = 8,64 mm rt 0,lO mm
Q9 = 5,08 mm + 0,lO mm
tzo = 86,ll mm + 0,20 mm
Q1 = 10,16 mm + 0,lO mm
Writing is enabled when the surface of the indicator is substantially flush with the cartridge Wall. When this surface is recessed
by at least 5,l mm writing is inhibited. When a forte of up to 1,O N is exerted perpendicularly on the centre of the surface of
the indicator, it shall not recede by more than 0,5 mm from reference plane B.
10.2 Back side and left side (figures 10 and 11)
The back side shall have a window the dimensions and Position of which shall be
Q2 = 8,76 mm + 0,lO mm
tz3 = 4,25 mm + 0,lO mm
ISO/IEC 13962: 1995 (E)
OISO/IEC
Q4 = 4,45 mm + 0,lO mm
Q5 = 8,89 mm & 0,lO mm
This window allows a further finger of the drive to penetrate into the case to finally unleck the reel of tape (see also 10.6).
A door shall be rotatably mounted at the comer of the back side and the left side. It is described in 10.6.
The left side shall have an edge the Position and length of which shall be
k& = 61,47 mm + 0,20 mm
+ 0,13 mm
Q7 = 9,65 mm
- 0,OO mm
10.3 Tape reel (figures 8,12 and 13)
The bottom side of the case shall have a circular window through which the drive spindle contacts the hub of the reel and
transmits torque. The diameter of this window shall be
d, = 35,05 mm + 0,08 mm
The Position of its centre shall be defined by
C,, = 50,42 mm + 0,31 mm
lTo = 52,83 mm + 0,lO mm
The interface between the spindle and the hub is provided by 48 evenly spaced teeth in the hub. In the non-operating Position,
the surface of the hub shall be recessed from the outside surface of the case by
Q8 = 0,38 mm + 0,05 mm
The tooth Profile consists of straight flanks. The envelope dimensions of the teeth shall be
d, = 23,88 mm + 0,13 mm
d, = 29,21 mm + 0,13 mm
d4 = 34,29 mm + 0,13 mm
A,=22"+30'
A, = 15” 3130
where d, is the pitch diameter of the teeth.
In the operating Position the surface of the hub shall be at a distance
tz9= 23,55 mm ZL 0,lO mm
from reference plane A.
10.4 Tape leader (figures 14,15 and 16)
The positions of the BOT and EOT relative to the leader/tape connection and to the physical end of the tape shall be as
follows.
The BOT shall be at a distance
k'30= 8 690 mm * 150 mm
from the leader/tape connection.
The EOT shall be at a distance
k'31= 2 540 mm & 127 mm
from the physical end of the tape, which is fixed to the hub of the reel. Both the BOT hole and EOT hole shall have a diameter
OISO/IEC
ISO/IEC 13962: 1995 (E)
d, = 4,78 mm ztz 0,lO mm
Figure 15 Shows the relative positions of the tape, the leader and the splice tape. They shall be defined by
11,81 mm min.
‘32=
20,32 mm max.
C,,= 0,25 mm max.
t34= 0,41 mm max.
t35= 0,OO mm min.
!36= 0,20 mm max.
Dimensions l 34, t35 and !36 are related to, and depend on, each other. Dimension 135 expresses the requirement that the splice
tape shall in no case extend beyond the edges of either the tape or the leader.
There shall be no yield of the splice when a forte of 22,2 N max. is applied in longitudinal direction across the splice.
Figure 16 Shows the dimensions of the leader which shall be
+ 0,OO mm
137 = 12,65 mm
- 0,lO mm
13*= 309,63 mm + 0,30 mm
J!~~= 130,81 mm + 0,30 mm
!40= 22,35 mm + 0,lO mm
k’41= 8,13 mm + 0,lO mm
!42= 3,05 mm + 0,05 mm
!43= 2,95 mm + 0,05 mm
+ 0,13 mm
144 = 2,79 mm
- 0,OO mm
!45= 18,54 mm k OJO mm
!46= 8,69 mm + 0,lO mm
t47= 5,89 mm Z!I 0,lO mm
t4*= 6,33 mm + 0,lO mm
!49= 3,40 mm -t 0,05 mm
lso= 3,73 mm + 0,05 mm
Ql= 5,00 mm + 0,05 mm
tS2= 7,47 mm + 0,lO mm
eS3= 6,86 mm + 0,lO mm
eS4= 8,15 mm st 0,lO mm
&= 2,24 mm + 0,lO mm
&= 3,40 mm + 0,05 mm
Q7= 5,89 mm + 0,lO mm
= 4,98 mm If- 0,05 mm
= 15,Ol mm Zl OJO mm
r2
ISO/IEC 13962: 1995 (E)
OISOIIEC
= 10,21 mm + 0,lO mm
y3
= 3,40 mm + 0,05 mm
r4
= 10,21 mm + OJO mm
r6 = 3,40 mm t 0,05 mm
A,=5"k30'
A, = 15” + 30’
A,=60"&30'
The design of the leade
...