ISO/IEC 16448:1999
(Main)Information technology — 120 mm DVD — Read-only disk
Information technology — 120 mm DVD — Read-only disk
Technologies de l'information — Disque DVD de diamètre 120 mm — Disque DVD à lecture seule
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 16448
First edition
1999-05-15
Information technology — 120 mm DVD —
Read-only disk
Technologies de l'information — Disque DVD de diamètre 120 mm —
Disque DVD à lecture seule
Reference number
B C
ISO/IEC 16448:1999(E)
---------------------- Page: 1 ----------------------
ISO/IEC 16448:1999 (E)
Contents
Section 1 - General
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 Definitions 1
4.1 Adhesive layer 1
4.2 Channel bit 1
4.3 Clamping Zone 2
4.4 Digital Sum Value (DSV) 2
4.5 Disk Reference Plane 2
4.6 Dual Layer disk 2
4.7 Dummy substrate 2
4.8 Entrance surface 2
4.9 Optical disk 2
4.10 Physical sector number 2
4.11 Read-only disk 2
4.12 Recorded layer 2
4.13 Reed-Solomon code 2
4.14 Reserved field 2
4.15 Sector 2
4.16 Single Layer disk 2
4.17 Spacer 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
7 General description of the disk 3
8 General requirements 4
8.1 Environments 4
8.1.1 Test environment 4
© ISO/IEC 1999
All rights reserved. Unless otherwise specified, 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.
ISO/IEC Copyright Office · Case postale 56 · CH-1211 Genève 20 · Switzerland
Printed in Switzerland
ii
---------------------- Page: 2 ----------------------
ISO/IEC ISO/IEC 16448:1999 (E)
8.1.2 Operating environment 5
8.1.3 Storage environment 5
8.1.4 Transportation 5
8.2 Safety requirements 5
8.3 Flammability 5
9 Reference measurement devices 5
9.1 Pick Up Head (PUH) 6
9.2 Measurement conditions 7
9.3 Normalized servo transfer function 7
9.4 Reference Servo for axial tracking 7
9.5 Reference Servo for radial tracking 8
Section 2 - Dimensional, mechanical and physical characteristics of the disk 9
10 Dimensional characteristics 9
10.1 Overall dimensions 10
10.2 First transition area 10
10.3 Second transition area 10
10.4 Clamping Zone 10
10.5 Third transition area 10
10.6 Information Zone 11
10.6.1 Sub-divisions of the Information Zone 11
10.6.2 Track geometry 11
10.6.3 Track modes 12
10.6.4 Channel bit length 12
10.7 Rim area 12
10.8 Remark on tolerances 12
10.9 Runout 12
10.9.1 Axial runout 12
10.9.2 Radial runout 12
10.10 Label 13
11 Mechanical parameters 13
11.1 Mass 13
11.2 Moment of inertia 13
11.3 Dynamic imbalance 13
11.4 Sense of rotation 13
12 Optical parameters 13
12.1 Index of refraction 13
12.2 Thickness of the transparent substrate 13
12.3 Thickness of the spacer of Types C and D 13
12.4 Angular deviation 13
12.5 Birefringence of the transparent substrate 13
12.6 Reflectivity 13
Section 3 - Operational Signals 17
13 High frequency signals (HF) 17
13.1 Modulated amplitude 17
13.2 Signal asymmetry 18
13.3 Cross-track signal 18
13.4 Quality of signals 18
13.4.1 Jitter 18
13.4.2 Random errors 18
iii
---------------------- Page: 3 ----------------------
ISO/IEC 16448:1999 (E) ISO/IEC
13.4.3 Defects 18
14 Servo signals 18
14.1 Differential phase tracking error signal 18
14.2 Tangential push-pull signal 19
Section 4 - Data Format 21
15 General 21
16 Data Frames 21
16.1 Identification Data (ID) 22
16.2 ID Error Detection Code (IED) 23
16.3 Copyright Management Information (CPR_MAI) 23
16.4 Error Detection Code (EDC) 23
17 Scrambled Frames 24
18 ECC Blocks 24
19 Recording Frames 26
20 Modulation 27
21 Physical Sectors 28
22 Suppress control of the d.c. component 29
Section 5 - Format of the Information Zone(s) 30
23 General description of an Information Zone 30
24 Layout of the Information Zone 30
25 Physical Sector numbering 30
26 Lead-in Zone 32
26.1 Initial Zone 33
26.2 Reference Code Zone 33
26.3 Buffer Zone 1 33
26.4 Buffer Zone 2 33
26.5 Control Data Zone 33
27 Middle Zone 36
28 Lead-out Zone 36
Annexes
A - Measurement of the angular deviation a37
B - Measurement of birefringence 39
C - Measurement of the differential phase tracking error 42
D - Measurement of light reflectance 46
E - Tapered cone for disk clamping 48
F - Measurement of jitter 49
G - 8-to-16 Modulation with RLL (2,10) requirements 52
H - Burst Cutting Area (BCA) 62
J - Transportation 67
K - Measurement of the thickness of the spacer of Dual Layer disks 68
L - Note on the Reference Code 70
iv
---------------------- Page: 4 ----------------------
ISO/IEC ISO/IEC 16448:1999 (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.
This International Standard was prepared by JISC (as Standard JIS X 6241-1997) with document support and contribution
from ECMA and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1,
Information technology, in parallel with its approval by national bodies of ISO and IEC.
Annexes A to H form a normative part of this International Standard. Annexes J to L are for information only.
v
---------------------- Page: 5 ----------------------
©
INTERNATIONAL STANDARD ISO/IEC ISO/IEC 16448:1999 (E)
Information technology — 120 mm DVD — Read-only disk
Section 1 - General
1 Scope
This International Standard specifies the mechanical, physical and optical characteristics of a 120 mm, read-only optical disk
to enable the interchange of such disks. It specifies the quality of the recorded signals, the format of the data and the recording
method, thereby allowing for information interchange by means of such disks. This disk is identified as DVD - Read-Only
Disk.
This International Standard specifies
- four related but different Types of this disk (see clause 7),
- 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 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 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. An optical disk shall be in conformance with this International
Standard if it meets the mandatory requirements specified for its 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 all four Types of optical disk
according to 2.1.
3 Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this International
Standard. At the time of publication, the edition indicated was 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
edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards.
IEC 950 (1991) Safety of information technology equipment.
4 Definitions
For the purposes of this International Standard, the following 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 pits.
1
---------------------- Page: 6 ----------------------
ISO/IEC 16448:1999 (E) ISO/IEC
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 Dual Layer disk: A optical disk with one or two entrance surface(s), in which each entrance surface gives access
to a different pair of recorded layers.
4.7 Dummy substrate: A layer which may be transparent or not, provided for the mechanical support of the disk
and/or of a recorded layer.
4.8 Entrance surface: The surface of the disk onto which the optical beam first impinges.
4.9 Optical disk: A disk that accepts and retains information in the form of pits in a recorded layer that can be read
by an optical beam.
4.10 Physical sector number: A serial number allocated to physical sectors on the disk.
4.11 Read-only disk: An optical disk in which the information has been recorded when manufacturing the disk. The
information cannot be modified and can only be read from the disk.
4.12 Recorded layer: A layer of the disk on, or in, which data is recorded.
4.13 Reed-Solomon code: An error detection and/or correction code for the correction of errors.
4.14 Reserved field: A field set to all ZEROs unless otherwise stated, and reserved for future standardization.
4.15 Sector: The smallest part of a track in the Information Zone that can be accessed independently of other
addressable parts.
4.16 Single Layer disk: An optical disk with one or two entrance surface(s), in which each entrance surface gives
access to a different recorded layer.
4.17 Spacer: In the case of Dual Layer disks, the transparent layer placed between the two recorded layers accessible
through the same entrance surface.
4.18 Substrate: A transparent layer of the disk, provided for mechanical support of the recorded layer(s), through
which the optical beam can access the recorded layer(s).
4.19 Track: A 360° turn of a continuous spiral.
4.20 Track pitch: The distance between the centrelines of a pair of adjacent physical tracks, measured in 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.
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 bit (lsb).
(8n-1) 0
Bit b is recorded first.
(8n-1)
2
---------------------- Page: 7 ----------------------
ISO/IEC ISO/IEC 16448:1999 (E)
5.2 Names
The names of entities, e.g. specific tracks, fields, zones, etc. are given a capital initial.
6 List of acronyms
BCA Burst-Cutting Area
BP Byte Position
BPF Band Pass Filter
CLV Constant Linear Velocity
CPR_MAI Copyright Management Information
DCC DC Component (suppress control)
DL Dual Layer
DPD Differential Phase Detection
DSV Digital Sum Value
ECC Error Correction Code
EDC Error Detection Code
EQ Equalizer
FWHM Full Width at Half Maximum
HF High Frequency
ID Identification Data
IED ID Error Detection (code)
IR Index of Refraction
LPF Low-Pass Filter
LSB Least Significant Byte
MSB Most Significant Byte
NRZ Non Return to Zero
NRZI Non Return to Zero Inverted
OTP Opposite Track Path
PBS Polarizing Beam Splitter
PE Phase Encoding
PI Parity (of the) Inner (code)
PLL Phase-Locked Loop
PO Parity (of the) Outer (code)
PTP Parallel Track Path
PUH Pick-Up Head
RIN Relative Intensity Noise
RS Reed-Solomon (code)
RZ Return to Zero
SL Single Layer
SYNC Code Synchronisation Code
lsb least significant bit
msb most significant bit
7 General description of the disk
The optical disk that is the subject of this International Standard consists of two substrates bonded together by an adhesive
layer, so that the recorded layers 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. This International Standard specifies
the following Types.
Type A consists of a substrate, a single recorded layer and a dummy substrate. The recorded layer can be accessed
from one side only. The nominal capacity is 4,7 Gbytes.
Type B consist of two substrates, and two recorded layers. From one side of the disk, only one of these recorded
layers can be accessed. The nominal capacity is 9,4 Gbytes.
Type C consists of a substrate, a dummy substrate and two recorded layers with a spacer between them. Both
recorded layers can be accessed from one side only. The nominal capacity is 8,5 Gbytes.
3
---------------------- Page: 8 ----------------------
ISO/IEC 16448:1999 (E) ISO/IEC
Type D consists of two substrates, each having two recorded layers with a spacer between these two recorded layers.
From one side of the disk, only one pair of recorded layers can be accessed. The nominal capacity is 17,0 Gbytes.
Figure 1 shows schematically these four Types. Types A and B are Single Layer (SL) disks and Types C and D are Dual Layer
(DL) disks. The two layers of DL disks are identified as Layer 0 and Layer 1. Layer 0 is the layer nearer to the entrance
surface. Types A and C are 1-sided disks, Types B and D are 2-sided disks.
In Type C the function of the adhesive layer can be provided by the spacer between the two recorded layers where Layer 1 is
placed, for instance embossed, on the dummy substrate.
Figure 1 - Types of 120 mm DVD - Read-Only disks
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.
4
---------------------- Page: 9 ----------------------
ISO/IEC ISO/IEC 16448:1999 (E)
a) For dimensional measurements b) For other measurements
temperature : 23 °C – 2 °C 15 °C to 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
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 °C to 70 °C
relative humidity : 3 % to 95 %
3 3
absolute humidity : 0,5 g/m to 60 g/m
sudden change of temperature : 50 °C max.
sudden change of relative humidity : 30 % max.
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 °C to 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.
8.1.4 Transportation
This International Standard does not specify requirements for transportation; guidance is given in annex J.
8.2 Safety requirements
The disk shall satisfy the requirements of IEC 950, 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
IEC 950.
9 Reference measurement devices
The reference measurement devices 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.
5
---------------------- Page: 10 ----------------------
ISO/IEC 16448:1999 (E) ISO/IEC
9.1 Pick Up Head (PUH)
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 influencing 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. The dimensions a and b equal M times 10 mm to 12 mm, where M is
the transversal magnification factor from the disk to its conjugate plane near the quadrant photo detector H.
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 from the quadrant photo detector
a b c d
E Objective lens J d.c. coupled amplifier
Figure 2 - Optical system for PUH
The characteristics of the PUH shall be as follows.
Wavelength (l) 650 nm – 5 nm
Polarization circularly polarized light
Polarizing beam splitter shall be used unless otherwise stated
Numerical aperture 0,60 – 0,01
6
---------------------- Page: 11 ----------------------
ISO/IEC ISO/IEC 16448:1999 (E)
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
tangential direction
Wave front aberration 0,033 l rms max.
2 2 2
Normalized detector size on a disk 100 mm ‹ S / M ‹ 144 mm
where S is the total surface of the photo detector of the PUH
Relative intensity noise (RIN) - 134 dB/Hz max.
10 log [(a.c. light power density /Hz) / d.c. light power ]
9.2 Measurement conditions
The measuring conditions for operational signals shall be as follows.
Scanning velocity at a Channel bit rate
of 26,15625 Mbits/s for Single Layer disks: 3,49 m/s – 0,03 m/s
for Dual Layer disks: 3,84 m/s – 0,03 m/s
Clamping force 2,0 N – 0,5 N
Taper cone angle 40,0° ± 0,5°, see annex E
CLV servo characteristic ƒ (-3 dB), closed loop bandwidth : 5 Hz
Focusing method astigmatic method
Tracking method differential phase detection
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.
3iw
1+
2
1ww
oo
H()wi =··(I)
s
iwŁł3 iw
1+
w3
o
where
w = 2pƒ
w=2pƒ
o o
i = -1
ƒ 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: ƒ = ƒ · 1/3
1 o
lag break frequency ƒ = ƒ· 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 3.
7
---------------------- Page: 12 ----------------------
ISO/IEC 16448:1999 (E) ISO/IEC
Figure 3 - Reference Servo for axial tracking
Bandwidth 100 Hz to 10 kHz
‰ 1 + H ‰ shall be within 20 % of ‰1+H‰.
s
The crossover frequency ƒ = w / 2p shall be specified by equation (II), where a 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 mm. Thus the crossover
max
frequency ƒ shall be
o
1 3a1 81··,5 3
max
f = = = 2,0 kHz (II)
0-6
e
2p2p0,23·10
max
The axial tracking error e is the peak deviation measured axially above or below the 0 level.
max
Bandwidth 23,1 Hz to 100 Hz
‰ 1 + H ‰ shall be within the limits defined by the following four points.
40,6 dB at 100 Hz (‰ 1 + Hs ‰ - 20% at 100 Hz )
66,0 dB at 23,1 Hz (‰ 1 + Hs ‰ - 20% at 23,1 Hz )
86,0 dB at 23,1 Hz (‰ 1 + Hs ‰ - 20% at 23,1 Hz add 20 dB)
44,1 dB at 100 Hz (‰ 1 + Hs ‰ + 20% at 100 Hz )
Bandwidth 9,6 Hz to 23,1 Hz
‰ 1 + H ‰ shall be between 66,0 dB and 86,0 dB.
9.5 Reference Servo for radial tracking
For an open-loop transfer function H of the Reference Servo for radial tracking, ‰1+H‰ is limited as schematically shown by
the shaded surface of figure 4.
8
---------------------- Page: 13 ----------------------
ISO/IEC ISO/IEC 16448:1999 (E)
.
Figure 4 - Reference Servo for Radial Tracking
Bandwidth from 100 Hz to 10 kHz
‰ 1 + H ‰ shall be within 20 % of‰1 + H‰.
s
The crossover frequency ƒ = w / 2p shall be specified by equation (III), where a shall be 1,5 times larger than the
o o max
2
expected maximum radial acceleration of 1,1 m/s . The tracking error e shall not exceed 0,022 mm. Thus the crossover
max
frequency ƒ shall be
o
1 3a1 11,,··15 3
max
f = = = 2,4 kHz (III)
0-6
2pe 2p0,022·10
max
The radial tracking error is the peak deviation measured radially inwards or outwards the 0 level.
Bandwidth from 23,1 Hz to 100 Hz
‰ 1 + H ‰ shall be within the limits defined by the following four points.
43,7 dB at 100 Hz (‰ 1 + Hs ‰ - 20% at 100 Hz )
69,2 dB at 23,1 Hz (‰ 1 + Hs ‰ - 20% at 23,1 Hz )
89,2 dB at 23,1 Hz (‰ 1 + Hs ‰ - 20% at 23,1 Hz add 20 dB)
47,3 dB at 100 Hz (‰ 1 + Hs ‰ + 20% at 100 Hz )
Bandwidth from 9,6 Hz to 23,1 Hz
‰ 1 + H ‰ shall be between 69,2 dB and 89,2 dB.
Section 2 - Dimensional, mechanical and physical characteristics of the disk
10 Dimensional characteristics (figures 5 to 8)
Dimensional characteristics are specified for those parameters deemed mandatory for interchange and compatible use of the
disk. Where there is freedom of design, only the functional characteristics of the elements described are indicated. The
enclosed drawings show the dimensional requirements in summarized form. The different parts of the disk are described from
the centre hole to the outside rim.
The dimensions are referred to two Reference Planes P and Q.
Reference Plane P is the primary Reference Plane. It is the plane on which the bottom surface of the Clamping Zone (see 10.4)
rests.
9
---------------------- Page: 14 ----------------------
ISO/IEC 16448:1999 (E) ISO/IEC
Reference Plane Q is the plane parallel to Reference Plane P at the height of the top surface of the Clamping Zone.
10.1 Overall dimensions
The disk shall have an overall diameter
d = 120,00 mm – 0,30 mm
1
The centre hole of a substrate or a dummy substrate shall have a diameter
+ 0,15 mm
d = 15,00 mm
2
- 0,00 mm
The diameter of the hole of an assembled disk, i.e. with both parts bonded together, shall be 15,00 mm min., see figure 6.
There shall be no burr on both edges of the centre hole.
The edge of the centre hole shall be rounded off or chamfered. The rounding radius shall be 0,1 mm max. The chamfer shall
extend over a height of 0,1 mm max.
The thickness of the disk, including adhesive layer, spacer(s) and label(s), shall be
+ 0,30 mm
e = 1,20 mm
1
- 0,06 mm
10.2 First transition area
In the area defined by d and
2
d = 16,0 mm min.
3
the surface of the disk is permitted to be above Reference Plane P and/or below Reference Plane Q by 0,10 mm max.
10.3 Second transition area
This area shall extend between diameter d and diameter
3
d = 22,0 mm max.
4
In this area the disk may have an uneven surface or burrs up to 0,05 mm max. beyond Reference Planes P and/or Q.
10.4 Clamping Zone
This zone shall extend between diameter d and diameter
4
d = 33,0 mm min.
5
Each side of the Clamping Zone shall be flat within 0,1 mm. The top side of the Clamping Zone, i.e. that of Reference Plane Q
shall be parallel to the bottom side, i.e. that of Reference Plane P within 0,1 mm.
In the Clamping Zone the thickness e of the disk shall be
2
+ 0,20 mm
e = 1,20 mm
2
- 0,10 mm
10.5 Third transition area
This area shall extend between diameter d and diameter
5
d = 44,0 mm max.
6
In this area the top surface is permitted to be above Reference Plane Q by
h = 0,25 mm max.
1
or below Reference Plane Q by
h = 0,10 mm max.
2
The bottom surface is permitted to be above Reference Plane P by
h = 0,10 mm max
3
10
---------------------- Page: 15 ----------------------
ISO/IEC ISO/IEC 16448:1999 (E)
or below Reference Plane P by
h = 0,25 mm max.
4
10.6 Information Zone
The Information Zone shall extend from the beginning of the Lead-in Zone to diameter d the value of which is specified in
10
table 1.
In the Information Zone the thickness of the disk shall be equal to e specified in 10.1.
1
10.6.1 Sub-divisions of the Information Zone
The main parts of the Information Zone are
-
the Lead-in Zone
- the Data Zone
- the Lead-out Zone
The area extending from d to diameter
6
d = 45,2 mm max.
7
shall be used as follows
- it is the beginning of the Lead-in Zone for Types A and B, and each pair of layers for Type C and D in PTP mode and on
Layer 0 in OTP mode,
- it is the end of the Lead-out Zone on Layer 1 for Types C and D in OTP mode.
In the first case, the Lead-in Zone shall end at diameter
+ 0,0 mm
d = 48,0 mm
8
- 0,4 mm
which is the beginning of the Data Zone.
In the second case the Data Zone shall not extend toward the centre of the disk beyond d . The Lead-out Zone shall start after
8
the Data Zone and end between diameters d and d .
6 7
The Data Zone shall start after the Lead-in Zone at diameter d , it shall extend up to diameter
8
d = 116,0 mm max.
9
The zone between diameters d and d constitutes the Lead-out Zone in the cases Types A and B, and Types C and D in PTP
9 10
mode and the Middle Zone in the case of Types C and D in OTP mode.
The Lead-out Zone in PTP mode and the Middle Zone shall start after the Data Zone and end at diameter d the value of
10
which depends on the length of the Data Zone as shown in table 1.
Table 1 - End of the Information Zone
Length of the Data Zone Value of diameter d
10
Less than 68,0 mm 70,0 mm min.
68,0 mm to 115,0 mm Data Zone diameter + 2,0 mm min.
115,0 mm to 116,0 mm 117,0 mm min.
The zone extending from d to d shall be used for the Burst Cutting Area, if implemented (see annex H).
11 12
10.6.2 Track geometry
In the Information Zone tracks are constituted by a 360° turn of a spiral.
The track pitch shall be 0,74 mm – 0,03 mm.
The track pitch averaged over the Data Zone shall be 0,74 mm – 0,01 mm.
11
---------------------- Page: 16 ----------------------
ISO/IEC 16448:1999 (E) ISO/IEC
10.6.3 Track modes
Tracks can be recorded in two different modes called Parallel Track Path (PTP) and Opposite Track Path (OTP). Figure 5
shows examples of the PTP and OTP modes. In practice, the lengths of the Data Zones of both layers are independent from
each other.
Types A and B shall be recorded in PTP mode only.
Types C and D may be recorded in either modes.
In PTP mode, tracks are read from the inside diameter of the Information Zone to its outside diameter, this applies to both
Layer 0 and Layer 1 for Types C and D, see figure 5a. On both layers, the track spiral is turning from the inside to the outside.
In OTP mode, tracks are read starting on Layer 0 at the inner diameter of the Information Zone, continuing on Layer 1 from
the outer diameter to the inner diameter. Thus, there is a Middle Zone at the outer diameter on both layers, see figure 5b. Th
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.