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STANDARD 11560
First edition
1992-12-15
Information technology - Information
interchange on 130 mm Optical disk cartridges
using the magneto-Optical effect, for write
once, read muttiple functionatity
- khange d’information sut- cartouches de
Technologies de I’information
disques optiques 730 mm, utilisant I’effet magnkto-optique, pour une
fonctionnalite non r&nscriptible, In lecture multiple
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Reference number
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ISO/IEC 11560:1992 (E)
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ISOIIEC 11560: 1992 (E)
Page
Contents
1
1
scope
1
2 Conformance
1
3 Normative references
1
4 Definitions
1
41 case
1
4:2 chmping zone
1
43 control track
1
cyclic redundancy check (CRC)
4:4
1
45 defect management
1
4:6 disk reference plane
1
4.7 entrance surface
1
error correction code (ECC)
48 .
2
49 format
2
4’10 hub
2
4’11 interleaving
2
4:12 Kerr rotation
2
land and groove
4.13
2
4.14 mark
2
4.15 Optical disk
2
4.16 Optical disk cartridge (ODC)
2
polarization
4.17
2
4.18 pre-recorded mark
2
4.19 read power
2
recording layer
4.20
2
4.21 Reed-Solomon code
2
4.22 spindle
2
Substrate
4.23
2
4.24 track
0 ISO/lEC 1992
All rights reserved. No part of this publication may bt: reproduced or utilized in any ferm or by nny
mxms, electronie or mechanicrd, including photocopying and microfilrn, without permission in writing
frorn the publisher.
International Organization for Stmdmlization
CH-121 1 Gentive 20 . Switzerland
Gase postule 56 l
Printed in Switzerland
ii
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ISO/IEC 11560: 1992 (E)
2
4.25 track pitch
2
4.26 write-inhibit hole
2
write once Optical disk
4.27
2
Conventions and notations
5
2
51 . Representation of numbers
3
52 . Names
3
6 List of acronyms
3
7 General description of the Optical disk cartridge
8 General requirements
Environments
81 .
8.1.1 Testing environment
Operating environment
8.1.2
8.1.3 Storage environment
Transportation
8.1.4
9 Safety requirements
5
10 Dimensional and mechanical characteristics of the case
5
10.1 General description of the case
5
10.2 Case drawings
6
10.3 Sides, references axes and reference planes
6
Relationship of Sides A and B
10.3.1
6
10.3.2 Reference axes and case reference planes
6
10.4 Materials
6
10.5 Mass
6
10.6 Overall dimensions
7
10.7 Location hole
7
10.8 Alignment hole
8
Surfaces on reference planes P
10.9
9
10.10 Insertion Slots and detent features
9
10.11 Gripper slots
9
10.12 Write-inhibit holes
10
10.13 Media Sensor holes
10
Head and motor window
10.14
11
10.15 Shutter
11
10.16 Slot for shutter opener
11
10.17 Shutter Sensor notch
12
10.18 User label areas
12
11 Dimensional and physical characteristics of the disk
12
11.1 Dimensions of the disk
12
11.1.1 Outer diameter
12
11.1.2 Thickness
12
11.1.3 Clamping zone
12
11.1.4 Clearance zone
. . .
111
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ISOIIEC 11560: 1992 (E)
13
Mass
11.2
13
11.3 Moment of inertia
13
Imbalance
11.4
13
11.5 Axial deflection
13
11.6 Axial acceleration
13
11.7 Dynamit radial runout
13
Radial Acceleration
11.8
.
13
11.9 Tilt
13
12 Drop test
13
13 Interface between disk and drive
13
13.1 Clamping technique
14
13.2 Dimensions of the hub
14
13.2.1 Outer diameter of the hub
14
13.2.2 Height of the hub
14
13.2.3 Diameter of the centre hole
14
13.2.4 Height of the top of the centre hole at diameter D,
14
13.2.5 Centring length at diameter D,
14
13.2.6 Chamfer at diameter D,
14
13.2.7 Chamfer at diameter D,
14
13.2.8 Outer diameter of the magnetizable ring
14
13.2.9 Inner diameter of the magnetizable ring
15
13.2.10 Thickness of the magnetizable material
15
13.2.11 Position of the top of the magnetizable ring relative to the disk reference plane
15
Magnetizable material
13.3
15
13.4 Clamping forte
15
13.5 Capture cylinder for the hub
15
13.6 Disk position in the operating condition
30
14 Characteristics of the Substrate
30
14.1 Index of refraction
30
14.2 Thickness
30
15 Characteristics of the recording layer
30
15.1 Test condi t ions
30
15.1.1 General
30
Read conditions
15.1.2
31
15.1.3 Write conditions
31
15.1.4 Erase conditions
32
Baseline reflectance
15.2
32
15.2.1 General
32
15.2.2 Actual value
32
Requirement
15.2.3
32
15.3 Magneto-Optical recording in the User Zone
32
Resolution
15.3.1
33
Imbalance of magneto-Optical Signal
15.3.2
iv
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ISOIIEC 11560: 1992 (E)
33
15.3.3 Figure of merit for magneto-Optical Signal
33
i5.3.4 Narrow-band signal-to-noise ratio
34
15.3.5 Cross-talk ratio
34
15.3.6 Esse of erasure
35
16 Disk format
35
16.1 Track geometry
35
16.1.1 Track shape
35
16.1.2 Direction of rotation
35
16.1.3 Track pitch
35
16.1.4 Track number
35
16.2 Formatted Zone
36
16.3 Control Tracks
36
16.4 Control track PEP Zone
36
16.4.1 Recording in the PEP Zone
37
16.4.2 Cross-track loss
37
16.4.3 Format of the tracks of the PEP Zone
41
16.5 Control Track SFP Zones
41
Duplicate of the PEP information
16.5.1
42
16.5.2 Media information
49
16.5.3 System information
49
Unspecified content
16.5.4
49
16.6 Requirements for interchange of a User-Recorded cartridge
49
16.6.1 Requirements for reading
49
16.6.2 Requirements for writing and erasing
49
17 Track format
- 49
17.1 Track layout
49
17.1.1 Tracking
50
17.1.2 Characteristics of pre-recorded information
52
17.2 Seetor format
54
17.2.1 Seetor Mark (SM)
54
17.2.2 VFO areas
54
17.2.3 Address Mark (AM)
54
17.2.4 ID and CRC
55
17.2.5 Postamble (PA)
55
17.2.6 Offset Detection Field (ODF)
55
17.2.7
Cap
55
17.2.8
FM!
55
17.2.9 Auto Laser Power Control (ALPC)
55
17.2.10 Sync
55
17.2.11 Data field
56
17.2.12 Buffer
56
17.3 Recording code
57
Defect management
17.4
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ISOIIEC 11560:1992 (E)
57
17.4.1 Media initialization
58
17.4.2 Write and read procedure
58
Layout of the User Zone
17.4.3
62
17.4.4 Summary of the location of the zones on the disk
Annexes
64
A - Optical System for measuring write, read and erase characteristics
66
B - Definition of write and erase pulse width
67
C - Measurement of figure of merit
68
D - Values to be implemented in existing and future Standards
69
E - Guidelines for the use of ODCs
70
F - CRC for ID fields
71
G - Interleave, CRC, ECC, Resync for the Data field
78
H - Seetor retirement guidelines
J - Office environment 78
79
K - Transportation
80
L - Requirements for interchange
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ISO/IEC 11560:1992 (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 tields of technical activity. ISO and
IEC technical comrnittees collaborate in tields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also
take part in the work.
In the flield 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 11560 was prepared by the European Computer
Manufacturers Association (as Standard ECMA-153) and was adopted, under a special
“fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, I@brmution
tehdugy, in parallel with its approval by national bodies ofIS0 and IEC.
Annexes A, B, C, F, G and L forrn an integral part of this International Standard.
Annexes D, E, H, J and K are for information only.
Patents
During the preparation of the ECMA Standard, information was gathered on Patents
upon which application of the Standard might depend. Relevant Patterns were
identified as belonging to Hewlett-Packard Company. However, neither ECMA nor
ISO/IEC tan give authoritative or comprehensive information about evidente, validity
or scope of patent and like rights. The patent holder has stated that licences will be
uranted under reasonable and non-discriminatory terms. Communications on this
b
subject should be addressed to
Hewlett-Packard Company
Greeley Division
700 7 1st Avenue
Greeley Colorado 80634
303 350 4ooo
USA
vii
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ISO/IEC 11560: 1992 (E)
Introduction
This International Standard specifies the characteristics of 130 mm Optical disk cartridges (ODC) which provide for the disk
to be initialized once, and the information to be written once only and read many times, using the magneto-Optical effect.
This International Standard
together with a Standard for volume and file structure provides for full data interchange between
data processing Systems.
. . .
Vlll
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INTERNATIONAL STANDARD ISO/IEC 11560:1992 (E)
Information technology - Information interchange on 130 mm Optical disk cartridges
using the magneto-Optical effect, for write once, read multiple functionality
1
Scope
This International Standard specifies
- definitions of the essential concepts;
- the environment in which the characteristics are to be tested;
- the environments in which the cartridge are to be operated and stored;
- the mechanical, physical and dimensional characteristics of the case and of the Optical disk;
- the magneto-Optical characteristics and the recording characteristics for initializing the disk once, for recording the
information once, for reading it many times, so as to provide physical interchangeability between data processing Systems;
- the format for the physical disposition of the tracks and sectors, the error correction Codes, the modulation method used
for recording and the quality of the recorded Signals.
2
Conformance
A 130 mm Optical disk cartridge is in conformance with this International Standard if it meets all the mandatory
requirements specified herein.
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 edition indicated was valid. All Standards are subject to revision, and Parties to
agreements based on this International Standard arc encouraged to investigate the possibility of applying the most recent
edition of the Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards.
ISO 683-13: 1986, Heat treatable steels, alloy steels andfree-cutting steels - Wrought stainless steels
ISO/IEC 9171.1:1990, Information technology - 130 mm Optical disk cartridge, write once, for information interchange -
Part 1: Unrecorded Optical disk cartridge
Safety of information technology equipment including electrical business equipment
IEC 950: 1986,
4 Definitions
For the purposes of this International Standard, the following definitions apply.
4.1 case : The housing for an Optical disk, that protects the disk and facilitates disk interchange.
42 . clamping zone : The annular part of the disk within which the clamping forte is applied by the clamping device.
43 . control track : A track containing the information on media Parameters and formst necessary for writing, reading
and erasing the remaining tracks on the Optical disk.
4.4 cyclic redundancy check (CRC) : A method for detecting errors in data.
45 . defect management : A method for handling the defective areas on the disk.
A plane defined by the perfectly flat annular surface of an ideal spindle onto which the
46 . disk reference plane :
clamping zone of the disk is clamped, and which is normal to the axis of rotation.
47 . entrance surface : The surface of the disk on to which the Optical beam first impinges.
48 . error correction code (ECC) : An error-detecting code designed to correct certain kinds of errors in data.
1
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ISO/IEC 11560: 1992 (E)
49 . format : The arrangement or layout of the data on the disk.
4.10 hub : The central feature on the disk which interacts with the spindle of the disk drive to provide radial centring and
the clamping forte.
4.11 interleaving : The process of allocating the physical sequence of units of data so as to render the data more immune
to burst errors.
4.12
Kerr rotation : The rotation of the plane of polarization of an Optical beam upon reflection from the recording layer
as caused by the magneto-Optical Kerr effect.
4.13 : A trench-like feature of the disk, applied before the recording of any information, and used to
land and groove
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.
4.14 mark : A feature of the recording layer which may take the form of a magnetic domain, a pit, or any other type or
form that tan be sensed by the Optical System. The Pattern of marks represents the data on the disk.
Note 1 - Subdivisions of a sector which are named ‘mark’ am not marks in the sense of this defiiition.
4.15 Optical disk : A disk that will accept and rettiin information in the form of marks in a recording layer, that tan be
read with an Optical beam.
4.16 Optical disk cartridge (ODC) : A device consisting of a case containing an Optical disk.
4.17 polarization : The direction of polarization of an Optical beam is the direction of the electric vector of the beam.
Note 2 - The plane of polarization is the plane containing the electric vector and the direction of propagation of the beam. The polarization is right-handed whentoan
observer looking in the direction of propagation of the beam the end-point of the electric vector would appear to describe an ellipse in the clockwise sense.
4.18 pre-recorded mark : A mark so formed as to be unalterable by magneto-Optical means.
6.19 read power : The read power is the Optical power, incident at the entrance surface of the disk, used when reading.
data. Iower power may be used providing that the signal-to-noise ratio
Note 3 - It is specified as a maximum power that may be used without damage to the wriuen
and other requirements of this International Standard are met.
4.20 recording layer : A layer of the disk on, or in, which data is written during manufacture a.nd/or use.
4.21 Reed-Solomon code : An error detection and/or correction Code which is particularly suited to the correction of
are strongly correlated.
errors which occur in bursts or
4.22 spindle : The part of the disk drive which contacts the disk and/or hub.
4.23 Substrate : A transparent layer of the disk, provided for mechanical support of the recording layer, through which
the optical beam accesses the recording layer.
4.24 track : The path which is followed by the focus of the Optical beam during one revolution of the disk.
4.25 track pitch : The distance between adjacent track centrelines, measured in a radial direction.
write-inhibit hole : A hole in the case which, when detected by the drive to be open, inhibits both write and erase
4.26
operations.
write once Optical disk : An Optical disk in which the data in specified areas tan be written only once and read
4.27
many times by an optical beam.
Conventions and notations
5
. Representation of numbers
51
In each field the information is recorded so that the most significant byte (byte 0) is recorded first. Within each
a)
byte the least significant bit is numbered bit 0, the most significant bit (i.e. bit 7 in an 8-bit byte) is recorded first.
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ISO/IEC 11560:1992 (E)
error-correcting cyclic redundancy Code,
This Order of recording applies also to the data input of the Codes, to the
and to their code output.
Unless otherwise stated, numbers arc expressed in binar-y notation. Where hexadecimal notation is used, the
b)
hexadecimal digits are shown between parentheses.
Bit combinations arc shown with the most signficant bit to the left.
Negative values arc expressed in TWO’s complement notation.
The setting of bits is denoted by ZERO and ONE.
52 . lbnes
The name of entities, e.g. specific tracks, Felds, etc., is shown with a capital initial.
6 List of acronyms
Auto Laser Power Control
Address Mark
CAV Constant Angular Velocity
CRC Cyclic Redundancy Check
DDS Disk Definition Seetor
DMA Defect Management Area
DMP Defect Management Pointer
DMT Defect Management Track
ECC Error Correction Code
EDAC Error Detection and Correction Code
ID Identifier
LBA Logical Block Address
Optical Disk Cartridge
ODC
ODF Offset Detection Field
PA
Postamble
PDL Prirnary Defect List
PEP Phase-Encoded Part of the Control Tracks
Run Length Limited (Code)
RLL(297)
R-S Reed-Solomon (Code)
Reed-Solomon Long Distance Code
R-S/LDC
SDL Secondary Defect List
SFP Standard Formatted Part of the Control Tracks
SM Seetor Mark
Variable Frequency Oscillator
General description of the Optical disk cartridge
The Optical disk cartridge which is the subject of this International Standard consists of a case containing an Optical disk. An
Optical beam is used to write data to, or to read data from, or to erase data from, the disk using the magneto-Optical Kerr
effect.
The disk tan be recorded either only on one side or on both sides.
The disk is intended for use in a drive with Optical access from one side only. To gain access to the second side of a disk
the cartridge must be reversed before insertion into the drive.
recordable on both sides,
Typically a disk recordable on one side consists of a transparent layer acting as a Substrate with a recording layer on one side
and a hub on the other. The recording layer is accessed by an Optical beam through the Substrate. A disk recordable on both
sides consists of two disks recordable on one side assembled together with the recording layers on the inside.
---------------------- Page: 11 ----------------------
ISO/IEC 11560: 1992 (E)
Other constructions arc permitted but must have the same characteristics.
.
8 General requirements
81 . Environments
8.1.1 Testing environment
Unless otherwise specified, tests and measurements made on the ODC to check the requirements of this International
Standard shall be carried out in an environment where the air immediately surrounding the ODC is within the following
conditions.
: 23 T i: 2 OC
Temperature
Relative humidity : 45 % to 55 %
Atmospheric pressure : 75 kPa to 105 kPa
Before testing, the ODC shall be conditioned in this environment for 48 h minimum. No condensation on or in the ODC shall
occllr.
8.1.2 Operating environment
Optical disk cartridges used for data interchange shall be operated in an environment where the air immediately surrounding
the ODC is within the following conditions.
: 10 OC to 50 OC
Temperatur-e
: lO%to80%
Relative humidity
: 29 OC max.
Wet bulb temperature
: 75 kPa to 105 kPa
Atmospheric pressure
: lO”C/hmax.
Temperature gradient
Relative humidity gradient : 10 % /h max.
: During loading and unloading of the cartridge the magnetic Geld strength at the
Magnetit field
recording layer shall not exceed 48 000 A/m.
No condensation on or in the ODC shall be allowed to occur.
If an ODC has been exposed during storage and/or transportation to conditions outside those specified in this clause, it shall
be acclimatized in the operating environment for at least 2 h before use. In the operating environment an ODC shall be
capable of withstanding a thermal shock of up to 20 OC when inserted into, or removed from, the drive.
See also annex J.
8.1.3 Storage environment
S torage environment is the ambient condition to which the ODC without any additional protective enclosure is exposed when
stored.
8.1.3.1 Short-term storage
-
ror a maximum period of 14 consecutive days the ODC shall not be exposed to environmental conditions outside mose given
below.
: -20 OC to 55 OC
Temperature
: 5 % to 90 %
Relative humidity
Wet bulb temperature : 29 OC max.
4
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ISO/IEC 11560: 1992 (E)
: 75 kPa to 105 kPa
Atmospheric pressure
Temperatur-e gradient :20”C/hmax.
: 20 % /h max.
Relative humidity gradient
: The magnetic field strength in the volume of the cartridge shall nowhere exceed
Magnetit field
48OOOA/m
No condensation on or in the ODC shaI1 be allowed to occur.
8.1.3.2 Long-term storage
For a storage period longer than 14 days the Optical disk cartridge shall not be exposed to environmental conditions outside
those given below.
Temperature :-10”Ct050”C
Relative humidity : 10% to90%
: 29 OC max.
Wet bulb temperature
Atmospheric pressure : 75 kPa to 105 kPa
Temperature gradien t : 15 OC /h max.
Relative humidity gradient : 10 % /h max.
: The magnetic field strength in the volume of the cartridge shall nowhere exceed
Magnetit field
48OOOA/m
No condensation on or in the ODC shall be allowed to occur.
* 8.1.4 Transportation
This International Strurdard does not specify requirements for transportation; guidance is given in annex K.
9 Safety requirements
The cartridge and its components shall satisfy the safety requirements of IEC 950, when used in its intended manner or in
any foreseeable use in an information processing System.
10 Dimensional and mechanical characteristics of the case
10.1 General description of the case (see figure 2)
The case shall be a rigid, protective enclosure of rectangular shape and include a shutter which uncovers access windows
upon insertion into the drive, and automatically covers them upon removal from the drive. The case shall have means for
positioning and identifying the cartridge, and write-inhibit holes.
The dimensions of the inside of the case are not specified in this International Standard, but are determined by the movement
of the disk inside the case allowed by 13.5 and 13.6.
10.2 Case drawings
The case is represented schematically by the following drawings.
- Figure 1 Shows the hub dimensions.
- Figure 2 Shows a composite drawing of Side A of the case in isometric form, with the major features identified from Side
A .
- Figure 3 Shows the envelope of the case with respect to a location hole at the intersection of the X and Y axes and
reference plane P.
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ISO/IEC 11560:1992 (E)
- Figure 4 Shows the surfaces S 1, S2, S3 and S4 which establish the reference plane P.
- Figure 4a Shows the details of surface S3.
- Figure 5 Shows the details of the insertion slot and detent.
- Figure 6 Shows the gripper Slots, used for automatic handling.
- Figure 7 Shows the write-inhibit holes.
Figure 8 Shows the media Sensor holes.
Figure 9 Shows the shutter Sensor notch.
Figure 10 Shows the head and motor window.
Figure 11 Shows the shutter opening features.
Figure 12 Shows the Capture cylinder.
Figure 13 Shows the user label areas.
10.3 Sides, reference axes and reference planes
10.3.1 Relationship of Sides A and B
The features essential for physical interchangeability are represented in figure 2. When Side A of the cartridge faces upwards,
Side A of the disk faces downwards. Sides A and B of the case at-e identical as far as the features given here are concemed.
The description is given for one side only. References to Sides A and B tan be changed to B or A respectively.
Only the shutter and the slot for the shutter opener, described in 10.14 and 10.15 are not identical for both sides of the case.
10.3.2 Reference axes and case reference planes
There is a reference plane P for each side of the case. Esch reference plane P contains two orthogonal axes X and Y to which
the dimensions of the case are referred. The intersection of the X and Y axes defines the centre of the location hole. The X
axis extends through the centre of the alignment hole.
10.4 Materials
The case shall be constructed from any suitable materials such that it meets the requirements of this International Standard.
10.5 Mass
The mass of the case without the Optical disk shall not exceed 150 g.
10.6 Overall dimensions (see figure 3)
The total length of the case shall be
L, = 153,0 mm * 0,4 mm
The distance from the top of the case to the reference axis X shall be
4 = 127,O mm * 0,3 mm
The distance from the bottom of the case to the reference axis X shall be
4 = 26,0 mm f: 0,3 mm
The total width of the case shall be
+ 0,o
Ld = 135,0 mm mm
- 0,6
The distance from the left-hand side of the cartridge to the reference axis Y shall be
---------------------- Page: 14 ----------------------
ISO/IEC 11560: 1992 (E)
+ 0,o
L, = 1285 mm mm
- 0,5
The distance from the right-hand side of the cartridge to the reference axis Y shall be
L6 = 6,5 mm i: 0,2 mm
The width shall be reduced on the top by the radius
R,=L,
originating from a point defined by Ls and
4 = 101,O mm * 0,3 mm
The two comers of the top shall be rounded with a radius
R,= 15 mm &0,5 mm
and the two comers at the bottom with a radius
R, = 3,0 mm k 1,0 mm
The thickness of the case shall be
L,= 11,00mm*0,30mm
The eight long edges of the case shall be rounded with a radius
= 1,0 mm max.
R4
Location hole (see figure 3)
10.7
The centre of the location hole shall coincide with the intersection of the reference axes X and Y. It shall have a Square ferm
with a side length of
+ 0,oo
mm
L, = 4,lO mm
- 0,06
held to a depth of
L 1. = 1,5 mm (i.e. typical wall thickness)
after which a cavity extends through to the alignment hole on the opposite side of the case.
The lead-in edges shall be rounded with a radius
R, = 0,5 mm max.
10.8 Alignment hole (see figure 3)
The centre of the alignment hole shall lie on reference axis X at a distance of
L,, = 122,0 mm i 0,2 mm
from the reference axis Y.
The dimensions of the hole shall be
+ 0,oo
L,, = 4,lO mm mm
- 0,06
+OT2 mm
L,, = 5,0 mm
- 0,o
held to a depth of L,,, after which a cavity extends through to the location hole on the opposite side of the case.
The lead-in edges shall be rounded with radius R,.
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ISO/IEC 11560: 1992 (E)
10.9 Surfaces on reference planes P (see figures 4 and 4a)
The reference plane P for a side of the case shall contain four surfaces (S 1, S,, S, and S,) on that side of the case, specified as
follows:
Two circular S, and S,.
surfaces
Surface S, shall be a circular area centred around the Square location hole and have a diameter of
D, = 9,0 mm min.
Surface S, shall be a circular area centred around the rectangular alignmcn! hole and have a diameter of
D, = 9,O mm min.
Two elongated surfaces S, and S,, that follow the contour of the cxtridge and shutter edges.
Surfaces S, and S, are shaped symmetrically.
Surface S, shaI1 be defined by two circular sections with radii
R, = 1,5 mm i: 0,l mm
with an origin given by
L 14 = 4,0 mm * 0,l mm
L,, = 86,0 mm * 0,3 mm
and
R, = 1,5 mm & 0,l mm
with an origin given by
L 16 = 1,9 mm i: o,l mm
17 = 124,5 mm & 0,3 mm
L
The arc with radius R7 shall continue on the right band side with radius
+ 0,2
R, = 134,0 mm mm
- 0.7
which is a dimension resulting from L, + L,, + R, with an origin given by L, and &. A straight, vertical line shall smoothly
join the arc of R, to the arc of R,.
The left-hand side of S, shall be bounded by radius
R, = 4,5 mm i 0,3 mm
which is a dimension resulting from L,, + L,, - R, with an origin given by
L 18 = 2,0 mm * 0,l mm
L,, = 115,5 mm * 0,3 mm
The left-hand side of the boundary shall be closed by two straight lines. The first one shall smoothly join the arc of R, to the
arc of R,. The second one shall run from the left hand tangent of R, to its intersection with R,. Along the left band side of
surface S, there shall be a zone to protect S, from being damaged by the shutter. In Order to keep this zone at a minimum
practical width
R 1. = 4,l mm max.
This radius originates from the same point as R,.
10.10 Insertion slots and detent features (see figure 5)
The case shall have two symmetrical insertion Slots with embedded detent fe3tcr-cs. The Slots shaI1 have a length of
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ISO/IEC 11560: 1992 (E)
b. = 26,0 mm & 0,3 mm
a width of
kl = 6,0 mm Ti’: mm
>
and a depth of
b2 = 3,0 mm * 0,l mm
k3 = 2,5 mm * 0,2 mm
from reference plane P.
The Slots shall have a lead-in chamfer given by
b4 = 0,5 mm max.
k5 = 5,0 mm max.
The detent notch shall be a semi-circle of radius
R,, = 3,0 mm i: 0,2 mm
with the origin given by
46 = 13,0 mm k 0,3 mm
b7 = 2,0 mm * 0,l mm
10.11 Gripper slots (see figure 6)
The case shall have two symmetrical gripper Slots with a depth of
b8 = 5,0 mm * 0,3 mm
from the edge of the case and a width of
b9 = 6,0 mm * 0,3 mm
The upper edge of a slot shall be
k. = 12,0 mm * 0,3 mm
above the bottom of the case.
10.12 Write-inhibit holes (see f’igure 7)
Sides A and B shall each have a write-inhibit hole. The case shall include a device for opening and closing each hole. The
hole at the left-hand side of Side A of the case, is the write-inhibit hole for Side A of the disk. The protected side of the disk
shall be made clear by inscriptions on the case or by the fact
...