EN 62345:2005

SLOVENSKI SIST EN 62345:2006
STANDARD
januar 2006
Format ID za 50-milimetrski magnetno-optični diskovni sistem (IEC
62345:2005)
(istoveten EN 62345:2005)
ID format for 50 mm magneto-optical disc system (IEC 62345:2005)
ICS 33.160.40 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 62345
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2005
ICS 33.160.40
English version
ID format for 50 mm magneto-optical disc system
(IEC 62345:2005)
Format de I’identifiant pour un système  ID-Format für das magneto-optische
à disque magnéto-optique de 50 mm System mit 50 mm Platte
(CEI 62345:2005) (IEC 62345:2005)

This European Standard was approved by CENELEC on 2005-02-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62345:2005 E
Foreword
The text of document 100/870/FDIS, future edition 1 of IEC 62345, prepared by IEC TC 100, Audio,
video and multimedia systems and equipment, was submitted to the IEC-CENELEC parallel vote and
was approved by CENELEC as EN 62345 on 2005-02-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2005-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-02-01
The International Electrotechnical Commission (IEC) and CENELEC draw attention to the fact that it is
claimed that compliance with this document may involve the use of a patent.
The IEC and CENELEC take no position concerning the evidence, validity and scope of this patent
right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences under
reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this
respect, the statement of the holder of this patent right is registered with the IEC.
Information may be obtained from:
Sanyo Electric Co., Ltd.
5-5, Keihan-hondori 2-chome,
Moriguchi City, Osaka, 570-8677, Japan
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights other than those identified above. IEC and CENELEC shall not be held responsible for
identifying any or all such patent rights.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62345:2005 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 62345:2005
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60950-1 2001 Information technology equipment - EN 60950-1 2001
(mod) Safety + A11 2004
Part 1: General requirements + corr. April 2004

ISO/IEC 13346-1 1995 Information technology - Volume and file - -
structure of write-once and rewritable
media using non-sequential recording for
information interchange
Part 1: General
INTERNATIONAL IEC
STANDARD 62345
First edition
2005-03
ID format for 50 mm magneto-optical
disc system
 IEC 2005  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
PRICE CODE
Commission Electrotechnique Internationale
XA
International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – 62345  IEC:2005(E)
CONTENTS
FOREWORD.7

1 Scope .9
2 Normative references .9
3 Terms and definitions .9
4 Conventions and notations.12
4.1 Representation of numbers .12
4.2 Names .12
5 List of acronyms .13
6 General description of the optical disc cartridge .13
7 General requirements .14
7.1 Environments .14
7.2 Temperature shock.14
7.3 Safety requirements.15
8 Reference drive .15
8.1 Optical system.15
8.2 Optical beam .16
8.3 Read channels .16
8.4 Tracking .17
8.5 Rotation of the disc.17
9 Mechanical and physical characteristics.17
9.1 Dimensional and physical characteristics of the cartridge .17
9.2 Dimensional, mechanical and physical characteristics of the disc.27
9.3 Interface between cartridge and drive .32
10 Format of information .33
10.1 Track geometry .33
10.2 Track format .34
10.3 Frame format.35
10.4 ECC Block format .42
10.5 Recording code .43
10.6 Format of the Information Zone .45
10.7 Format of the Data Zone .46
10.8 Defect Management.51
11 Characteristics of embossed information .55
11.1 Method of testing.55
11.2 Signals from grooves (see Figure 26).56
11.3 Signals from wobble groove (see Figure 27).57
11.4 Signal from fine clock marks (see Figure 28) .58
12 Characteristics of the recording layer .59
12.1 Method of testing.59
12.2 Magneto-optical characteristics.60
13 File system.63
13.1 Volume.63
13.2 File .73

62345  IEC:2005(E) – 3 –
14 File format of Sound and Images .78
14.1 General .78
14.2 Directory Structure .78
14.3 File Format.79

Annex A (normative) Air cleanliness class 100000 .82
Annex B (normative) Measurement method of reference plane flatness.83
Annex C (normative) Measurement method of cartridge flatness .84
Annex D (normative) Measurement method of cartridge curvature.85
Annex E (normative) Test method for measuring the friction force.86
Annex F (normative) Format of the Data Field .88
Annex G (normative) Contents of Control Tracks .95
Annex H (normative) Relaxation by zones of the requirement for signals.99
Annex I (informative) Transportation.100
Annex J (informative) Track deviation measurement .101
Annex K (informative) Digital still camera image file format standard – Exif .105
Annex L (informative) Design Rule for Camera File System – DCF.106
Annex M (informative) Movie file format – QuickTime.107

Figure 1 – Optical system of the reference drive .15
Figure 2 – Outline of cartridge.18
Figure 3 – Cartridge reference line and reference plane.19
Figure 4 – Cartridge Top and Side View .23
Figure 5 – Cartridge Bottom View.24
Figure 6 – Shutter.25
Figure 7 – Shutter lock.25
Figure 8 – Holding area .26
Figure 9 – Screw location.26
Figure 10 – Disc dimensions .28
Figure 11 – Thickness of the protective coating .32
Figure 12 – Gap between the disc and the internal wall of the cartridge .33
Figure 13 – Track layout .34
Figure 14 – Layout of the Address Segment .35
Figure 15 – Wolbble Pattern of the Address Segment………………………………………. .35
Figure 16 – Layout of the Data Segment .39
Figure 17 – The patterns of the Pre-write field and the Post-write field .40
Figure 18 – ECC Block layout .42
Figure 19 – Header.43
Figure 20 – NRZI Plus convolution method .44
Figure 21 – NRZI Plus convolution method .44
Figure 22 – Layout of the Data Zone and Test Zones.47
Figure 23 – Structure of Logical Zone.51

– 4 – 62345  IEC:2005(E)
Figure 24 – Structure of PDL entry .54
Figure 25 – Structure of SDL entry .55
Figure 26 – Signals from grooves.57
Figure 27 – Signals from wobbled groove .57
Figure 28 – Signals from fine clock marks .58
Figure 29 – Radial push-pull signal and envelope of fine clock mark .58
Figure 30 – Recording magnetic field shape and Write pulse .60
Figure 31 – Resolution.61
Figure 32 – Spectrum analyser display .61
Figure 33 – Crosstalk test pattern .62
Figure 34 – Directory structure including motion picture.79
Figure A.1 – Particle size distribution curve .82
Figure B.1 – Measurement method of reference plane flatness .83
Figure C.1 – Measurement method of cartridge flatness .84
Figure D.1 – Measurement method of cartridge curvature .85
Figure E.1 – Arrangement of testing chip and disc for the measurement of friction force.86
Figure E.2 – Shape of testing chip.87
Figure E.3 – Test cycle .87
Figure F.1 – Processing flow to generate Data unit 1 .88
Figure F.2 – Processing flow to generate Data unit 2 and Data unit 3.88
Figure F.3 – Data unit 1 configuration.89
Figure F.4 – Data ID information .89
Figure F.5 – Feedback shift register for generation scramble data.92
Figure F.6 – ECC block configuration .93
Figure F.7 – ECC block after row interleave.94
Figure G.1 – Track layout of the Control Zone .96
Figure G.2 – Layout of the Control Segment .96
Figure G.3 – Unit of the Control Segment .97
Figure J.1 – Maximum allowed amplitude of a sinusoidal track deviation .101
Figure J.2 – Implementation of a Reference Servo by filtering the track position signal
with the reduction characteristics of the Reference Servo .103
Figure J.3 – Implementation of a Reference Servo by changing the transfer function of
the actual servo .103
Figure J.4 – Implementation of a Reference Servo by changing the tracking error of
the actual servo .104

Table 1 – Write protection .21
Table 2 – User hole .22
Table 3 – Index hole .22
Table 4 – Nominal Address Data clock frequencies when the disc rotates at 50 Hz .41
Table 5 – Layout of the Information Zone .45
Table 6 – Locations of the DMAs.47
Table 7 – Byte assignment of the Disc Definition Structure (DDS) .48
Table 8 – Assign of Logical Zone .49

62345  IEC:2005(E) – 5 –
Table 9 – Content of the PDL .53
Table 10 – Content of the SDL .54
Table 11 – OSTA CS0 Charspec .63
Table 12 – Time stamp .64
Table 13 – Domain Entity Identifier.64
Table 14 – Domain Identifier Suffix.64
Table 15 – UDF Entity Identifier .65
Table 16 – UDF Identifier Suffix .65
Table 17 – Implementation Entity Identifier .65
Table 18 – Implementation Identifier Suffix.65
Table 19 – Beginning Extended Area Descriptor .66
Table 20 – NSR Descriptor .66
Table 21 – Terminating Extended Area Descriptor .66
Table 22 – Descriptor Tag.67
Table 23 – Anchor Volume Descriptor Pointer.67
Table 24 – Primary Volume Descriptor .67
Table 25 – Implementation Use Volume Descriptor.68
Table 26 – Implementation Use of Implementation Use Volume Descriptor.68
Table 27 – Partition Descriptor.69
Table 28 – Partition Contents.69
Table 29 – Partition Header Descriptor.69
Table 30 – Logical Volume Descriptor .70
Table 31 – File Set Descriptor Extent Information .70
Table 32 – Integrity Sequence Extent Information.71
Table 33 – Partition Maps .71
Table 34 – Unallocated Space Descriptor .71
Table 35 – Terminating Descriptor.71
Table 36 – Logical Volume Integrity Descriptor .72
Table 37 – Logical Volume Contents Use .72
Table 38 – Implementation.72
Table 39 – lb_addr (Logical Block Address).73
Table 40 – short_ad (Short Allocation Descriptor) .73
Table 41 – long_ad (Long Allocation Descriptor).73
Table 42 – File Set Descriptor.73
Table 43 – File Identifier Descriptor.74
Table 44 – d-characters .74
Table 45 – File Entry.75
Table 46 – ICB Tag.76
Table 47 – Extended Attributes .76
Table 48 – Extended Attributes Header Descriptor.76
Table 49 – File Times Extended Attribute .77
Table 50 – Flags in ICB Tag.77
Table 51 – Space Bitmap Descriptor .77

– 6 – 62345  IEC:2005(E)
Table 52 – Allocation Extent Descriptor .78
Table F.1 – Initial value of shift register.91
Table G.1 – Layout of the Control Zones .95
Table H.1 – Requirements for signals in each zone .99

62345  IEC:2005(E) – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ID FORMAT FOR 50 mm MAGNETO-OPTICAL
DISC SYSTEM
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
The IEC draws attention to the fact that it is claimed that compliance with this document may
involve the use of a patent.
The IEC takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the IEC that he/she is willing to negotiate licences
under reasonable and non-discriminatory terms and conditions with applicants throughout the
world. In this respect, the statement of the holder of this patent right is registered with IEC.
Information may be obtained from:
Sanyo Electric Co., Ltd.
5-5, Keihan-hondori 2-chome,
Moriguchi City, Osaka, 570-8677, Japan
Attention is drawn to the possibility that some of the elements of this document may be the
subject of patent rights other than those identified above. The IEC shall not be held
responsible for identifying any or all such patent rights.

– 8 – 62345  IEC:2005(E)
International Standard IEC 62345 has been prepared by IEC technical committee 100: Audio,
video, and multimedia systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
100/870/FDIS 100/912/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in
the data related to the specific publication. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

62345  IEC:2005(E) – 9 –
ID FORMAT FOR 50 mm MAGNETO-OPTICAL
DISC SYSTEM
1 Scope
This International Standard specifies the characteristics of 50 mm Optical Disc Cartridges
(ODC) with a capacity of 730 Mbytes per Cartridge. This regulation covers the logical format
of removable 50 mm magneto-optical discs used on digital still cameras, digital movie
cameras, electronic albums and similar devices and combinations of these devices that record,
play or process the digital data of still pictures, motion pictures and audio. This standard
specifies the recording and reproducing format and processing method of files of still pictures,
motion pictures and audio on 50 mm magneto-optical discs so that the users can use these
discs on various compatible devices.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60950-1:2001, Information technology equipment – Safety – Part 1: General requirements
ISO/IEC 13346-1:1995, Information technology – Volume and file structure of write-once and
rewritable media using non-sequential recording for information interchange – Part 1: General
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
band
part of the Data Zone comprising a fixed number of consecutive physical tracks
3.2
base band wobble address
address information formed by wobbling with bi-phase modulation
3.3
case
housing for an optical disc, that protects the disc and facilitates disc interchange
3.4
channel bit
smallest element for the representation of data on a disc. It is recorded as either a space or a
mark
3.5
clamping zone
annular part of the disc within which the clamping force is applied by the clamping device

– 10 – 62345  IEC:2005(E)
3.6
control zone
zone containing the information on media parameters and format necessary for writing and
reading the remaining tracks of the optical disc
3.7
Cyclic Redundancy Check
CRC
method for detecting errors in data
3.8
data clock
clock for data detection and data recording, generated by a PLL synchronized to fine clock
marks
3.9
defect management
method for handling the defective areas on the disc
3.10
disc reference plane
plane defined by the perfectly flat annular surface of an ideal spindle onto which the clamping
zone of the disc is clamped, and which is normal to the axis of rotation
3.11
ECC Block
group of frames to perform ECC 32 kB ECC Block execute Error Correction with a set of 16
frames
3.12
embossed information
information so formed as to be unalterable by magneto-optical means
3.13
entrance surface
surface of the disc onto which the optical beam first impinges
3.14
Error Correction Code
ECC
error-detecting code designed to correct certain kinds of errors in data
3.15
Fine Clock Mark
embossed mark on disc for generating a clock
3.16
format
arrangement of information on the disc
3.17
frame
least physical addressable unit, which holds 2 048 data bytes and ECC bytes, and is
comprised numbers of segments
62345  IEC:2005(E) – 11 –
3.18
interleaving
process of allocating the physical sequence of units of data so as to render the data more
immune to burst errors
3.19
land and groove
trench-like feature of the disc, applied before the recording of any information, and used to
define the track location. The groove is located nearer to the entrance surface than the land
with which it is paired to form a track
3.20
Logical Zone
user data area including spare sector for Defect Management
3.21
magnetic field modulation
technique for recording encoded information on the disc by switching a recording magnetic
field between two opposite directions
3.22
optical disc
disc that will accept and retain information in the form of marks in a recording layer that can
be read with an optical beam
3.23
optical disc cartridge
ODC
device consisting of a case containing an optical disc
3.24
polarization
direction of polarization of an optical beam is the direction of the electric vector of the beam
3.25
protective coating
layer coated on top of the recording layer to protect from environmental influences and
emergency landing of magnetic head
3.26
read power
optical power, incident at the entrance surface of the disc, used when reading
3.27
recording magnetic field
magnetic field that switches between two opposite directions (both perpendicular to the disc
surface) according to the encoded information. When the focus spot of a laser beam heats the
disc sufficiently, this magnetic field causes a permanent magnetic domain in the magneto-
optical layer on the disc
3.28
recording layer
layer of the disc on or in which data is written during manufacture and/or use
3.29
Reed-Solomon code
error detection and/or correction code which is particularly suited for the correction of errors
which occur in bursts or are strongly correlated

– 12 – 62345  IEC:2005(E)
3.30
sector
least logical addressable unit from host interface, which holds 2 048 user bytes with Defect
Management process adopted
3.31
segment
subdivision of a Frame bounded by an interval of Fine Clock Mark. The first segment of a
frame is used as an address segment
3.32
spindle
part of the disc drive which is in contact with the disc
3.33
substrate
transparent layer of the disc, provided for mechanical support of the recording layer, through
which the optical beam accesses the recording layer
3.34
track
path which is followed by the focus of the optical beam during one revolution of the disc. A
track consists of a groove or a land
3.35
track pitch
distance between adjacent track (a groove and a land) centre lines, measured in a radial
direction
3.36
zone
annular area of the disc
4 Conventions and notations
4.1 Representation of numbers
A measured value is rounded off to the least significant digit of the corresponding specified
value. It implies that a specified value of 1,26 with a positive tolerance of +0,01, and a
negative tolerance of –0,02 allows a range of measured values from 1,235 to 1,275.
– Letters and digits in parentheses represent numbers in hexadecimal notation.
– The setting of a bit is denoted by ZERO or ONE.
– Numbers in binary notation and bit combinations are represented by strings of 0 and 1.
– Numbers in binary notation and bit combinations are shown with the most significant bit to
the left.
– Negative values of numbers in binary notation are given in TWO's complement.
– In each field the data is recorded so that the most significant byte (byte 0) is recorded first.
Within each byte the least significant bit is numbered 0 and is recorded first, the most
significant bit (numbered 7 in an 8-bit byte) is recorded last. This order of recording applies
also to the data input of the Error Detection and Correction circuits and to their output.
4.2 Names
The names of entities, for example, specific tracks, fields etc., are given with a capital initial.

62345  IEC:2005(E) – 13 –
5 List of acronyms
ALPC Auto Laser Power Control
ADB Address Data Bit
CDS Codeword Digital Sum
CRC Cyclic Redundancy Check
DCB Data Channel Bit
DDS Disc Definition Structure
DMA Defect Management Area
DSV Digital Sum Value
ECC Error Correction Code
EDC Error Detection Code
FA1 Functional Area 1
FA2 Functional Area 2
FCM Fine Clock Mark
ID Identifier
IED ID Error Detection code
LSB Least Significant Byte
LZ Logical Zone
MO Magneto-Optical
MSB Most Significant Byte
NRZI Non Return to Zero Inverted
ODC Optical Disc Cartridge
PDL Primary Defect List
PI Parity of Inner-code
PO Parity of Outer-code
R/W Rewritable
RS Reed-Solomon
SDL Secondary Defect List
ZCAV Zoned Constant Angular Velocity
ZCLV Zoned Constant Linear Velocity
6 General description of the optical disc cartridge
The optical disc cartridge which is the subject of this standard consists of a case containing
an optical disc.
The case is a protective enclosure for the disc. It has access windows covered by a shutter.
The windows are automatically uncovered by the drive when the cartridge is inserted into it.
The optical disc is recordable on one side. Data can be written onto the disc as marks in the
form of magnetic domains in the recording layer and can be overwritten with new data with a
focused optical beam, using the thermo-magnetic effect. The data can be read with a focused
optical beam, using the magneto-optical effect. The beam accesses the recording layer
through the transparent substrate of the disc.

– 14 – 62345  IEC:2005(E)
7 General requirements
7.1 Environments
7.1.1 Testing environment
Temperature: 23 °C ± 2 °C
Relative humidity: 45 % to 55 %
Atmospheric pressure: 60 kPa to 106 kPa
Air cleanliness: Class 100 000

7.1.2 Operating environment
Temperature: 0 °C to 60 °C
Relative humidity: 3 % to 85 %
3 3
Absolute humidity: 1 g/m to 30 g/m
Atmospheric pressure: 60 kPa to 106 kPa
Temperature gradient: 10 °C/h maximum
Relative humidity gradient: 10 %/h maximum
Air cleanliness: office environment
Magnetic field strength at the recording layer
for any condition under which a beam is in 2 000 A/m maximum
focus:
Magnetic field strength at the recording layer
48 000 A/m maximum
during any other condition:
7.1.3 Storage environment
Temperature: –20 °C to 70 °C
Relative humidity: 3 % to 90 %
3 3
Absolute humidity: 1 g/m to 30 g/m
Atmospheric pressure: 60 kPa to 106 kPa
Temperature gradient: 15 °C/h maximum
Relative humidity gradient: 10 %/h maximum
Air cleanliness: office environment
Magnetic field strength at the recording layer: 48 000 A/m maximum

7.1.4 Transportation
This standard does not specify requirements for transportation; guidance is given in Annex I.
7.2 Temperature shock
The optical cartridge shall withstand a temperature shock of up to 20 °C when inserted into, or
removed from, the drive.
62345  IEC:2005(E) – 15 –
7.3 Safety requirements
The cartridge shall satisfy the safety requirements of IEC 60950, when used in the intended
manner or in any foreseeable use in an information processing system.
8 Reference drive
8.1 Optical system
The basic set-up of the optical system of the reference drive used for measuring the write and
read parameters is shown in Figure 1. Different components and locations of components are
permitted, provided that the performance remains the same as that of the set-up in Figure 1.
The optical system shall be such that the detected light reflected from the entrance surface of
the disc is minimized so as not to influence the accuracy of the measurements.
O N
I =I +I , I =I +I
1 a c 2 b d
L
4 L
I =I +I , I =I +I
3 a b 4 c d
_ _
+ +
I I I
I
4 1 2
+
Ch. 2
_
K
K L
2 2
Tangential
K
I I
a b
+
Radial
Ch. 1
J
I
I +
c d
L
M
H
FG
E
IEC  266/05
A B C D
A Laser diode I , I Push-pull channels
1 2
B Collimator lens I , I Tangential push-pull channels
3 4
C Optional shaping prism J Polarizing beam splitter
Ch.1 Channel 1 K , K Photodiodes for Channels 1 and 2
1 2
Ch.2 Channel 2 K Split photodiode
D Beam splitter L , L , L , L DC-coupled amplifiers
1 2 3 4
E Polarizing beam splitter M Phase retarder
F Objective lens N Track- centre detection signal
G Optical disc O Clock-mark detection signal
H Optional half-wave plate
Figure 1 – Optical system of the reference drive
In the absence of polarization changes in the disc, the polarizing beam splitter J shall be
aligned to make the signal of detector K equal to that of detector K . The direction of
1 2
polarization in this case is called the neutral direction. The phase retarder M shall be adjusted
in such a way that the optical system does not have more than 2,5° phase retardation
between the neutral polarization and the polarization perpendicular to it. This position of the
retarder is called the neutral position.

– 16 – 62345  IEC:2005(E)
The beam splitter J shall have a p-s intensity reflectance ratio of at least 100.
The beam splitter E shall have an intensity reflectance R from F to H of nominally 0,30 for the
p
neutral polarization direction. The reflectance R for the polarization perpendicular to the
s
neutral direction shall be nominally 0,95. The actual value
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