ISO/IEC 20563:2001

INTERNATIONAL ISO/IEC
STANDARD 20563
First edition
2001-06-01
Information technology — 80 mm
(1,23 Gbytes per side) and 120 mm
(3,95 Gbytes per side) DVD-recordable disk
(DVD-R)
Technologies de l'information — Disque enregistrable DVD (DVD-R) de
80 mm (1,23 Gbytes par face) et 120 mm (3,95 Gbytes par face) de
diamètre
Reference number
ISO/IEC 20563:2001(E)
©
ISO/IEC 2001

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ISO/IEC 20563:2001(E)
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ISO/IEC 20563:2001(E)
Contents Page
Section 1 — General 1
1 Scope 1
2 Conformance 1
2.1 Optical Disk 1
2.2 Generating system 1
2.3 Receiving system 1
3 Normative reference 1
4 Terms and definitions 2
4.1 Adhesive layer 2
4.2 Channel bit 2
4.3 Clamping Zone 2
4.4 Digital Sum Value (DSV) 2
4.5 Disk Reference Plane 2
4.6 Dummy substrate 2
4.7 Entrance surface 2
4.8 Groove 2
4.9 Land 2
4.10 Optical disk 2
4.11 Physical sector number 2
4.12 Read-only disk 2
4.13 Recording layer 2
4.14 Reed-Solomon code 2
4.15 Reserved field 2
4.16 Sector 2
4.17 Space 2
4.18 Substrate 2
4.19 Track 2
4.20 Track pitch 2
4.21 Zone 2
5 Conventions and notations 2
5.1 Representation of numbers 2
5.2 Names 3
6 List of acronyms 3
6.1 General 3
7 General description 3
8 General requirements 4
8.1 Environments 4
8.1.1 Test environment 4
8.1.2 Operating environment 4
8.1.3 Storage environment 5
8.1.4 Transportation 5
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ISO/IEC 20563:2001(E)
8.2 Safety requirements 5
8.3 Flammability 5
9 Reference measurement devices 5
9.1 Pick Up Head (PUH) 5
9.1.1 PUH for measuring recorded disks 5
9.1.2 PUH for measuring unrecorded disks 6
9.2 Measurement conditions 7
9.2.1 Recorded and unrecorded disk 7
9.2.2 Recorded disk 8
9.2.3 Unrecorded disk 8
9.3 Normalized servo transfer function 8
9.4 Reference servo for axial tracking 8
9.5 Reference servo for radial tracking 9
Section 2 — Dimensional, mechanical and physical characteristics of the disk 10
10 Dimensional characteristics 10
10.1 Overall dimensions 12
10.2 First transition area 12
10.3 Second transition area 12
10.4 Clamping Zone 12
10.5 Third transition area 13
10.6 R-Information Zone 13
10.6.1 Sub-divisions of the R-Information Zone 13
10.7 Information Zone 13
10.7.1 Sub-divisions of the Information zone 13
10.8 Track geometry 14
10.9 Channel bit length 14
10.10 Rim area 14
10.11 Remark on tolerances 15
10.12 Label 15
11 Mechanical parameters 15
11.1 Mass 15
11.2 Moment of inertia 15
11.3 Dynamic imbalance 15
11.4 Sense of rotation 15
11.5 Runout 15
11.5.1 Axial runout 15
11.5.2 Radial runout 15
12 Optical parameters 15
12.1 Recorded and unrecorded disk parameters 15
12.1.1 Index of refraction 15
12.1.2 Thickness of the transparent substrate 16
12.1.3 Angular deviation 16
12.1.4 Birefringence of the transparent substrate 16
12.2 Recorded disk reflectivity 16
12.3 Unrecorded disk parameters 16
12.3.1 Polarity of reflectivity modulation 16
12.3.2 Recording power sensitivity variation 16
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ISO/IEC 20563:2001(E)
Section 3 — Operational signals 17
13 Operational signals for recorded disk 17
13.1 Measurement conditions 17
13.2 Read conditions 17
13.3 Recorded disk high frequency (HF) signals 17
13.3.1 Modulated amplitude 17
13.3.2 Signal asymmetry 17
13.3.3 Cross-track signal 17
13.4 Quality of signals 18
13.4.1 Jitter 18
13.4.2 Random errors 18
13.4.3 Defects 18
13.5 Servo signals 18
13.5.1 Differential phase tracking error signal 18
14 Operational signals for the unrecorded disk 20
14.1 Measurement conditions 20
14.2 Recording conditions 20
14.3 Basic write strategy for media testing 20
14.4 Servo signals 21
14.4.1 Radial push-pull tracking error signal 21
14.4.2 Cross-track signal before recording (Radial Contrast = RC) 21
14.4.3 Defects 23
14.5 Addressing signals 23
14.5.1 Land Pre-pit signal 23
14.5.2 Groove wobble signal 24
14.5.3 Relation in phase between wobble and Land Pre-pit 24
Section 4 — Data format 25
15 General 25
16 Data Frames 25
16.1 Identification Data (ID) 26
16.2 ID Error Detection Code 27
16.3 Copyright Management Information (CPR_MAI) 27
16.4 Error Detection Code 27
17 Scrambled Frames 27
18 ECC Block configuration 28
19 Recording Frames 30
20 Modulation 30
21 Physical Sectors 31
22 Suppress control of the d.c. component 32
23 Linking scheme 33
23.1 Linking sector 33
23.2 Linking loss area 33
23.2.1 Padding sectors 33
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ISO/IEC 20563:2001(E)
Section 5 — Format of the Information Zone 35
24 General description of the Information Zone 35
24.1 Layout of the Information Zone 35
24.2 Physical sector numbering 35
25 Lead-in Zone and Lead-out Zone 36
25.1 Lead-in Zone 36
25.1.1 Initial Zone 37
25.1.2 Reference Code Zone 37
25.1.3 Buffer Zone 1 38
25.1.4 Buffer Zone 2 38
25.2 Control Data Zone 38
25.2.1 Physical format information 38
25.2.2 Disk manufacturing information 40
25.2.3 Reserved 40
25.3 Lead-out Zone 40
Section 6 — Format of the Unrecorded Zone 40
26 General description of the Unrecorded Zone 40
26.1 Layout of the Unrecorded Zone 41
26.2 ECC block address 41
26.3 ECC block numbering 41
27 Pre-pit Data format 41
27.1 General description 41
27.2 Pre-pit block structure 44
27.3 Pre-pit data block configuration 46
27.3.1 Relative address 46
27.3.2 ECC block address data configuration 47
27.3.3 Parity A and Parity B 47
27.3.4 Field ID0 47
27.3.5 Field ID1 48
27.3.7 Field ID3 to Field ID5 53
28 Data structure of R-Information Zone 55
28.1 Layout of Power Calibration Area and Recording Management Area 55
28.2 Structure of the Power Calibration Area 55
28.3 Data configuration of the Recording Management Area (RMA) 56
28.3.1 Sector format of the Recording Management Area 56
28.3.2 Recording Management Data (RMD) 57
Annexes
A - Measurement of the angular deviation� 63
B - Measurement of birefringence 65
C - Measurement of the differential phase tracking error 67
D - Measurement of light reflectance 71
E - Tapered cone for disk clamping 73
F - Measurement of jitter 74
G - 8-to-16 Modulation with RLL (2,10) requirements 77
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ISO/IEC 20563:2001(E)
H - Border Zone 87
J - Optimum Power Control 91
K - Wavelength dependency 92
L - Light fastness of the disk 93
M - Measurement of the groove wobble amplitude 94
N - Measurement methods for the operational signals for an unrecorded disk 96
P - Variation of the Write Strategy 97
Q - Measurement method of the Land Pre-Pit signal 98
R - Note on the Reference Code 99
S - Running OPC 100
T - Transportation 101
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ISO/IEC 20563:2001(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 fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
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.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights.
ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 20563 was prepared by JISC (as Standard JIS X.6245:1999) with document support and
contribution from ECMA and was adopted under a special "fast-track procedure", by Joint Technical Committee JTC 1,
Information technology, in parallel with its approval by national bodies of ISO and IEC.
Annexes A to N form a normative part of this International Standard. Annexes P to T are for information only.
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INTERNATIONAL STANDARD ISO/IEC 20563:2001(E)
Information technology — 80 mm (1,23 Gbytes per side) and 120 mm
(3,95 Gbytes per side) DVD-recordable disk (DVD-R)
Section 1 — General
1Scope
This International Standard specifies the mechanical, physical and optical characteristics of an 80 mm and a 120 mm DVD -
Recordable disk to enable the interchange of such disks. It specifies the quality of the pre-recorded, unrecorded and the
recorded signals, the format of the data, the format of the information zone, the format of the unrecorded zone, and the
recording method, thereby allowing for information interchange by means of such disks. This disk is identified as a DVD -
Recordable (DVD-R) disk. Once data has been recorded on a DVD-R disk it cannot be modified. It can be read many times.
Further data may be appended.
This International Standard specifies
• 80 mm and 120 mm nominal diameter disks that may be either single or double sided,
the conditions for conformance,
the environments in which the disk is to be operated and stored,
the mechanical and physical characteristics of the disk, so as to provide mechanical interchange between data processing
systems,
the format of the pre-recorded information on an unrecorded disk, including the physical disposition of the tracks and
sectors, the error correcting codes and the coding method used,
the format of the data and the recorded information on the disk, including the physical disposition of the tracks and sectors,
the error correcting codes and the coding method used,
the characteristics of the signals from pre-recorded and unrecorded areas on the disk, enabling data processing systems to
read the pre-recorded information and to write to the disks,
the characteristics of the signals recorded on the disk, enabling data processing systems to read the data from the disk.
This International Standard provides for interchange of disks between disk drives. Together with a standard for volume and file
structure, it provides for full data interchange between data processing systems.
2 Conformance
2.1 Optical Disk
A claim of conformance shall specify the type of the disk, i.e. its size and whether it is single-sided or double sided. An optical
disk shall be in conformance with this International Standard if it meets the mandatory requirements specified for this type.
2.2 Generating system
A generating system shall be in conformance with this International Standard if the optical disk it generates is in accordance
with 2.1.
2.3 Receiving system
A receiving system shall be in conformance with this International Standard if it is able to handle an optical disk according to
2.1.
3 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this
International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not
apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the
normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
IEC 60950 Safety of information technology equipment
ISO 105-B02 Textiles - Tests for colour fastness - Part B02: Colour fastness to artificial light: Xenon arc fading lamp test
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ISO/IEC 20563:2001(E)
4 Terms and definitions
For the purpose of this International Standard, the following terms and definitions apply.
4.1 Adhesive layer: A layer of adhesive material bonding together the two parts of the disk.
4.2 Channel bit: The elements by which, after modulation, the binary values ZERO and ONE are represented on the disk
by marks.
4.3 Clamping Zone: The annular part of the disk within which a clamping force is applied by a clamping device.
4.4 Digital Sum Value (DSV): The arithmetic sum obtained from a bit stream by allocating the decimal value 1 to bits set
to ONE and the decimal value –1 to bits set to ZERO.
4.5 Disk Reference Plane: A plane defined by the perfectly flat annular surface of an ideal spindle onto which the
Clamping Zone of the disk is clamped, and which is normal to the axis of rotation.
4.6 Dummy substrate: A layer which may be transparent or not, that is provided for the mechanical support of the disk
and/or of a recorded layer.
4.7 Entrance surface: The surface of the disk onto which the optical beam first impinges.
4.8 Groove: A trench-like feature of the disk, 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. The recording is made on the centre of the
groove.
4.9 Land: The area between the grooves.
4.10 Optical disk: A disk that accepts and retains information in the form of recorded marks in a recording layer and that
can be read by an optical beam.
4.11 Physical sector number: A serial number allocated to the physical sectors on the disk.
4.12 Read-only disk: An optical disk in which the information has been recorded during manufacture of the disk. The
information cannot be modified and can only be read from the disk.
4.13 Recording layer: A layer of the disk on, or in, which data is recorded.
4.14 Reed-Solomon code: An error detection and/or correction code for the correction of errors.
4.15 Reserved field: A field set to all ZEROs unless otherwise stated, and reserved for future standardization.
4.16 Sector: The smallest addressable part of a track in the information zone of a disk that can be accessed independently
of other addressable parts.
4.17 Space: The area in a track between successive marks
4.18 Substrate: A transparent layer of the disk, provided for mechanical support of the recording or recorded layer,
through which the optical beam accesses the recording or recorded layer.
4.19 Track: A 360� turn of a continuous spiral.
4.20 Track pitch: The distance between adjacent average physical track centrelines of the wobbled grooves for the
unrecorded disk, or between adjacent physical track centrelines of the train of recorded marks for the recorded disk,
measured in the radial direction.
4.21 Zone: An annular area of the disk.
5 Conventions and notations
5.1 Representation of numbers
A measured value is rounded off to the least significant digit of the corresponding specified value. For instance, 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.
Numbers in decimal notations are represented by the digits 0 to 9.
Numbers in hexadecimal notation are represented by the hexadecimal digits 0 to 9 and A to F in parentheses.
The setting of bits is denoted by ZERO and ONE.
Numbers in binary notations and bit patterns are represented by strings of digits 0 and 1, with the most significant bit shown to
the left.
Negative values of numbers in binary notation are given as Two’s complement.
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ISO/IEC 20563:2001(E)
In each field the data is recorded so that the most significant byte (MSB), identified as Byte 0, is recorded first and the least
significant byte (LSB) last. In a field of 8n bits, bit b shall be the most significant bit (msb) and bit b the least significant
(8n-1) 0
bit (lsb). Bit b is recorded first.
(8n-1)
5.2 Names
The names of entities, e.g. specific tracks, fields, areas, zones, etc. are given a capital initial.
6 List of acronyms
6.1 General
BP Byte Position
BPF Band Pass Filter
CLV Constant Linear Velocity
CPR_MAI Copyright Management Information
DSV Digital Sum Value
ECC Error Correction Code
EDC Error Detection Code
HF High Frequency
ID Identification Data
IED ID Error Detection (code)
LPF Low-Pass Filter
LSB Least Significant Byte
MSB Most Significant Byte
NRZI Non Return to Zero Inverted
OPC Optimum Power Control
PBS Polarizing Beam Splitter
PCA Power Calibration Area
PI Parity (of the) Inner (code)
PO Parity (of the) Outer (code)
PUH Pick-Up Head
RMA Recording Management Area
RMD Recording Management Data
RS Reed-Solomon (code)
SYNC Code Synchronization Code
lsb least significant bit
msb most significant bit
7 General description
The 80 mm and 120 mm optical disks that are the subject of this International Standard consist of two substrates bonded
together by an adhesive layer, so that the recording layer (single-sided disk) or recording layers (double-sided disk) are on the
inside. The centring of the disk is performed on the edge of the centre hole of the assembled disk on the side currently read.
Clamping is performed in the Clamping Zone. The DVD-Recordable Disk (DVD-R) may be either double-sided or single-
sided with respect to the number of recording layers. A double-sided disk has a recording layer on the inside of each substrate.
A single-sided disk has one substrate with the recording layer on the inside and a dummy substrate without a recording layer.
An unrecorded DVD-R disk provides for the data to be irreversibly written by a drive. A recorded disk provides for the data to
be read many times by an optical beam of a drive. A recorded DVD-R disk is equivalent to a DVD-Read-Only Disk. Figure 1
shows schematically a double-sided and a single-sided disk.
Type 1S consists of a substrate, a single recording layer, an adhesive layer, and a dummy substrate. The recording layer can be
accessed from one side only. The nominal capacity is 1,23 Gbytes for an 80 mm disk and 3,95 Gbytes for a 120 mm disk.
Type 2S consists of two substrates, two recording layers, and an adhesive layer. From one side of the disk only one recording
layer can be accessed. The nominal capacity is 2,26 Gbytes for an 80 mm disk and 7,9 Gbytes for a 120 mm disk.
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ISO/IEC 20563:2001(E)
Entrance surface
Substrate
Recording layer
Type 1S
Adhesive layer
Dummy substrate
Entrance surface
Substrate
Recording layer
Type 2S
Adhesive layer
Recording layer
Substrate
Entrance surface
97-0122-A
Figure 1 — Disk outline
8 General requirements
8.1 Environments
8.1.1 Test environment
The test environment is the environment where the air immediately surrounding the disk has the following properties.
a) For dimensional measurements b) For other measurements
temperature : 23 �C��2 �C15 �Cto 35 �C
relative humidity: 45 % to 55 % 45 % to 75 %
atmospheric pressure: 86 kPa to 106 kPa 86 kPa to 106 kPa
Unless otherwise stated, all tests and measurements shall be made in this test environment.
8.1.2 Operating environment
8.1.2.1 Recorded and unrecorded disk
This International Standard requires that an optical disk which meets all mandatory requirements of this International Standard
in the specified test environment provides data interchange over the specified ranges of environmental parameters in the
operating environment.
Disks used for data interchange shall be operated under the following conditions, when mounted in the drive supplied with
voltage and measured on the outside surface of the disk.
The disk exposed to storage conditions shall be conditioned in the operating environment for at least two hours before
operating.
temperature: -25 �Cto 70 �C
relative humidity: 3 % to 95 %
3 3
absolute humidity: 0,5 g/m to 60 g/m
temperature gradient: 15 �C/h max.
relative humidity gradient: 10 %/h max.
There shall be no condensation of moisture on the disk.
8.1.2.2 Unrecorded disk environmental conditions during recording
The disk exposed to storage conditions shall be conditioned in the recording environment for at least two hours before
operating.
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ISO/IEC 20563:2001(E)
temperature: -5 �Cto 55 �C
relative humidity: 10 % to 95 %
3 3
absolute humidity: 0,5 g/m to 30 g/m
There shall be no condensation of moisture on the disk.
8.1.3 Storage environment
The storage environment is the environment where the air immediately surrounding the optical disk shall have the following
properties.
temperature: -20 �Cto 50 �C
relative humidity: 5 % to 90 %
3 3
absolute humidity: 1 g/m to 30 g/m
atmospheric pressure: 75 kPa to 106 kPa
temperature variation: 15 �C/h max.
relative humidity variation: 10 %/h max.
Recorded and unrecorded disks shall be in conformance to clauses 12 and 14 after being subjected to the light fastness test. See
annex L.
8.1.4 Transportation
This International Standard does not specify requirements for transportation; guidance is given in annex T.
8.2 Safety requirements
The disk shall satisfy the requirements of Standard IEC 60950, when used in the intended manner or in any foreseeable use in
an information system.
8.3 Flammability
The disk shall be made from materials that comply with the flammability class for HB materials, or better, as specified in
Standard IEC 60950.
9 Reference measurement devices
The reference measurement devices for recorded disks and for unrecorded disks shall be used for the measurements of optical
parameters for conformance with this International Standard. The critical components of these devices have specific properties
defined in this clause.
9.1 PickUpHead(PUH)
9.1.1 PUH for measuring recorded disks
The optical system for measuring the optical parameters is shown in figure 2. It shall be such that the detected light reflected
from the entrance surface of the disk is minimized so as not to influence the accuracy of measurement. The combination of the
polarizing beam splitter C with the quarter-wave plate D separates the incident optical beam and the beam reflected by the
optical disk F. The beam splitter C shall have a p-s intensity/reflectance ratio of at least 100. Optics G generates an astigmatic
difference and collimates the light reflected by the recorded layer of the optical disk F for astigmatic focusing and read-out.
The position of the quadrant photo detector H shall be adjusted so that the light spot becomes a circle the centre of which
coincides with the centre of the quadrant photo detector H when the objective lens is focused on the recorded layer. An
example of such a photo detector H is shown in figure 2.
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ISO/IEC 20563:2001(E)
J
II,,II,
abcd
Read Channel
+
a
H
b
G
Quadrant photo detector H
C D F
A B E
97-0019-A
A Laser diode F Optical disk
B Collimator lens G Optics for the astigmatic focusing method
C Polarizing beam splitter H Quadrant photo detector
D Quarter-wave plate I , I , I , I Output currents from the quadrant photo detector
a b c d
E Objective lens J d.c. coupled amplifier
Figure 2 — Optical system of PUH for measuring Recorded disk
The characteristics of the PUH shall be as follows.
Wavelength (�) 650 nm ± 5 nm
Polarization circularly polarized light
Polarizing beam splitter shall be used unless otherwise stated
Numerical aperture 0,60 ± 0,01
Light intensity at the rim of the pupil of the objective lens 60 % to 70 % of the maximum intensity
level in radial direction, and over 90 % of the
maximum intensity level in the tangential
direction
Wave front aberration 0,033� rms max.
Relative intensity noise (RIN)
10 log [(a.c. light power density / Hz) / d.c. light power ] -134 dB/Hz max.
9.1.2 PUH for measuring unrecorded disks
The optical system for measuring the parameters is shown in figure 3. The optical system shall be used to measure the
unrecorded disk specifications and for the recordings that are necessary for disk measurements. Different components and
locations of the components are permitted, provided that the performance remains the same as the set-up in figure 3. The
optical system shall be such that the detected light reflected from the entrance surface of the disk is minimized so as not to
influence the accuracy of the measurements.
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ISO/IEC 20563:2001(E)
H
1 H
3
I
Radial direction
+ 1
Read Channel 1
+
+
+
I I
b
a
Read Channel 2
+
+
Tracking Channel
+
I I
d c I
H
2
H 4
Quadrant photo
2
I I I
I
detector G a b c d
G
B
A C D E F
97-0123-A
A Laser diode F Optical disk
B Collimator lens G Quadrant photo detector
C Polarizing beam splitter H ,H ,H ,H d.c.-coupled amplifier
1 2 3 4
D Quarter-wave plate I , I , I , I Output currents from the quadrant photo
a b c d
detector
E Objective lens
Figure 3 — Optical system of PUH for measuring unrecorded disks
The combination of polarizing beam splitter C and a quarter-wave plate D shall separate the entrance optical beam from a laser
diode A and the reflected optical beam from an optical disk F. The beam splitter C shall have a p-s intensity reflectance ratio of
at least 100.
The focused optical beam used for writing and reading data shall have the following properties:
Wavelength (�) 635 nm ± 5 nm
Polarization circularly polarized light
Numerical aperture 0,60 ± 0,01
Light intensity at the rim of the pupil of the objective lens Over 35 % of the maximum intensity level in
the radial direction and over 50 % of the
maximum intensity level in the tangential
direction
Wave front aberration 0,033� rms max.
Relative intensity noise (RIN) of the laser diode - 130 dB/Hz max.
10 log [(a.c. light power density /Hz) / d.c. light power ]
9.2 Measurement conditions
9.2.1 Recorded and unrecorded disk
Scanning velocity at a Channel bit rate of 26,15625 Mbit/s 3,84 m/s� 0,03 m/s
Clamping force 2,0 N� 0,5 N
Clamping Zone See 10.5 and annex A.
Tapered cone angle 40,0�±0,5° see annex E
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ISO/IEC 20563:2001(E)
9.2.2 Recorded disk
The measuring conditions for the recorded disk operational signals shall be as specified in annex F.
9.2.3 Unrecorded disk
The measuring conditions for the unrecorded disk operational signals shall be as specified in annex N
9.3 Normalized servo transfer function
In order to specify the servo system for axial and radial tracking, a function H is used (equation I). It specifies the nominal
s
values of the open-loop transfer function H of the Reference Servo(s) in the frequency range 23,1 Hz to 10 kHz.
3i�
1�
2
��
1 ��
oo
H()i��� � (I)
s
��
3 ��i� i�
1�
3�
o
where
� =2��
� =2��
o o
i= �1
� is the 0 dB crossover frequency of the open loop transfer function. The crossover frequencies of the lead-lag network of the
o
servo are given by
lead break frequency: � =� � 1/3
1 o
lag break frequency � =� � 3
2 o
9.4 Reference servo for axial tracking
For an open loop transfer function H of the Reference Servo for axial tracking, �1+H� is limited as schematically shown by
the shaded surface of figure 4.
Gain (dB)
86,0
66,0
62,3
44,1
40,6
2
8,0 m/s
0
9,6 23,1 100 10 000
Frequency (Hz)
96-0297-A
Figure 4 — Reference servo for axial tracking
Bandwidth 100 Hz to 10 kHz
�1+H� shall be within 20 % of�1+H �.
s
The crossover frequency � = � /2� shall be specified by equation (II), where � shall be 1,5 times larger than the
o o max
2
expected maximum axial acceleration of 8 m/s . The tracking error e shall not exceed 0,23 �m. Thus, the crossover
max
frequency � shall be
o
8 © ISO/IEC 2001 – All rights reserved

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ISO/IEC 20563:2001(E)
113� 81��,5 3
max
f = �� 2,0 kHz (II)
0
�6
22��
e
0,23�10
max
The axial tracking error e is the peak deviation measured axially above or below the 0 level.
max
Bandwidth23,1Hzto100 Hz
�1+H� shall be within the limits defined by the following four points.
40,6 dB at 100 Hz (�1+H
...