ISO/IEC 12247:1993
(Main)Information technology — 3,81 mm wide magnetic tape cartridge for information interchange — Helical scan recording — DDS format using 60 m and 90 m length tapes
Information technology — 3,81 mm wide magnetic tape cartridge for information interchange — Helical scan recording — DDS format using 60 m and 90 m length tapes
Specifies the physical and magnetic characteristics. Also specifies the quality of the recorded signals, the recorded format and the recording method, thereby allowing data interchange between drives by means of such magnetic tape cartridges. Specifies two types of cartridges referred to as type A (magnetic tape of nominal thickness of 13 µm and a nominal length of up to 60,5 m) and type B (magnetic tape of a nominal thickness of 9 µm and a nominal length of up to 92,0 m).
Technologies de l'information — Cartouche de bande magnétique de 3,81 mm de large pour l'échange d'information — Enregistrement par balayage en spirale — Format DDS utilisant des bandes de 60 m et 90 m de long
General Information
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Standards Content (Sample)
INTERNATIONAL ISO/IEC
STANDARD 12247
First edition
1993-12-15
Information technology - 3,81 mm wide
magnetic tape cartridge for information
interchange - Helical scan recording -
DDS format using 60 m and 90 m length
tapes
Technologies de l’information - Cartouche de bande magne’tique de
3,81 mm de large pour Mchange d’information - Enregistrement par
balayage en spirale - Format DDS utilisant des bandes de 60 m et
90 m de long
Reference number
ISO/IEC 12247: 1993(E)
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ISO/IEC 12247: 1993 (E)
contents
Page
1
Section 1 - General
1
1 Scope
1
2 Conformance
1
Magnetic tape cartridge
21 .
1
22 . Generating system
2
23 . Receiving system
2
3 Normative references
2
4 Definitions
2
41 . Absolute Frame Number (AFN)
2
Area ID
42 .
2
Automatic Track Finding (ATF)
43 .
2
44 . Average Signal Amplitude
2
. azimuth
45
2
46 . back surface
2
47 . byte
2
. cartridge
48
2
49 Channel Bit
2
4’10 Data Format ID
3
4’11 Early Warning Point (EWP)
3
4’12 End of Data (EOD)
3
4’13
Error Correcting Code @CC)
3
4’14 flux transition position
3
4’15 flux transition spacing
3
4’16 frame
3
4’17 Housekeeping Frame
3
4’18 . Logical Beginning of Tape (LBOT)
0 ISO/IEC 1993
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 l Case postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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ISO/IEC 12247: 1993 (E)
3
4.19 magnetic tape
3
4.20 Master Standard Amplitude Calibration Tape
Master Standard Reference Tape 3
4.21
3
4.22 Optimum Recording Field
3
4.23 partition boundary
3
4.24 Physical Beginning of Tape (PBOT)
3
Physical End of Tape (PEOT)
4.25
3
4.26 physical recording density
3
4.27 pre-recording condition
3
4.28 record
3
Reference Recording Field
4.29
3
4.30 Secondary Standard Amplitude Calibration Tape
4
4.31 Secondary Standard Reference Tape
4
4.32 Separator Mark
4
4.33 Standard Reference Amplitude
4
4.34 Tape Reference Edge
4
4.35 Test Recording Current
4
4.36 track
4
437 Virtual End of Tape (VEOT)
4
5 Environment and safety
51 . Testing environment
52 . Operating environment
53 . Storage environment
54 l Transportation
55 . Safety
56 . Flammability
5
Section 2 - Requirements for the case
5
6 Dimensional and mechanical characteristics of the case
‘1 1’
61 . General
62 . Overall dimensions
63 . Loading grip
64 Holding areas
0
Notches of the lid
65 l
Lid dimensions
66 .
67 l Optical detection of the beginning and end of tape
68 . Bottom side
8
6.8.1 Locking mechanism of the slider
9
6.8.2 Access Holes
9
6.8.3 Recognition, Subdatums, and Write-inhibit Holes
10
6.8.4 Datum Holes
11
6.8.5 Access room for tape guides
11
6.8.6 Holes for accessing the hubs
11
6.8.7 Internal structure of the lower half
12
6.8.8 Light path
13
6.8.9 Support Areas
13
6.8.10 Datum Areas
. . .
111
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ISOIIEC 12247:1993 (E)
13
6.8.11 Relationship between Support and Datum Areas and Reference Plane Z
13
69 Hubs
14
Leader and trailer attachment
6110
14
6.11 Interface between the hubs and the drive spindles
14
6.12 Opening of the lid
14
6.13 Release of the hub locking mechanism
15
6.14 Label areas
26
Section 3 - Requirements for the unrecorded tape
26
7 Mechanical, physical and dimensional characteristics of the tape
26
71 Materials
26
7:2 Tape length
26
7.2.1 Length of magnetic tape
26
Length of leader and trailer tapes
7.2.2
26
7.2.3 Length of splicing tapes
26
73 . Tape width
26
7.3.1 Width of magnetic, leader and trailer tapes
26
Width and position of splicing tape
7.3.2
.
26
Discontinuities
74 .
26
75 . Total thickness
27
76 . Longitudinal curvature
27
77 . Cupping
27
78 . Coating adhesion
27
79 Layer-to-layer adhesion
28
Tensile strength
7’10 .
28
7.10.1 Breaking strength
28
7.10.2 Yield strength
28
7.11 Residual elongation
28
7.12 Electrical resistance of coated surfaces
29
7.13 Light transmittance of the tape
29
8 Magnetic recording characteristics
30
81 . Optimum Recording Field
30
82 . Signal amplitude
30
Resolution
83 .
30
84 . Overwrite
3 002 ftpmm 30
of 750,6 ftpmm and
8.4.1 Physical recording densities
31
of 83,4 ftpmm and 1 001 ftpmm
8.4.2 Physical recording densities
31
85 . Ease of erasure
31
86 . Tape quality
iv
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lSO/IEC 12247: 1993 (E)
8.6.1 Missing pulses
31
8.6.2 Missing pulse zone
31
87 . Signal-to-noise ratio (S/N) characteristic
31
Section 4 - Requirements for an interchanged tape
31
9 Format
31
91 . General
31
92 . Basic Groups
32
9.2.1 Group Information Table
33
9.2.2 Block Access Table 34
93 . Sub-Groups
37
9.3.1 G 1 Sub-Group
37
9.3.2 G2 Sub-Group - randomizing
38
9.3.3 G3 Sub-Group
38
9.3.4 G4 Sub-Group 40
9.3.5 Main Data Block 44
94 . Sub Data Area
45
9.4.1 Pack Item No. 1
46
9.4.2 Pack Item No. 2
47
9.4.3 Pack Item No. 3 48
9.4.4 Pack Item No. 4 49
9.4.5 Pack Item No. 5 50
9.4.6 Pack Item No. 6 51
9.4.7 Pack Item No. 7 52
9.4.8 Pack Item No. 8 53
9.4.9 Sub Data Block 53
57
10 Method of recording
10.1 Physical recording density 57
10.2 Long-term average bit cell length 57
10.3 Short-term average bit cell length 57
57
10.4 Rate of change
57
10.5 Bit shift
10.6 Read signal amplitude 57
57
10.7 Maximum recorded levels
57
11 Track geometry
57
11.1 Track configuration
11.2 Average track pitch 58
11.3 Variations of the track pitch 58
11.4 Track width 58
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lSO/IEC 12247: 1993 (E)
58
11.5 Track angle
59
11.6 Track edge linearity
59
11.7 Track length
59
11.8 Ideal tape centreline
59
11.9 Azimuth angles
59
Recording of blocks on the tape
12
59
12.1 Recorded Main Data Block
59
12,2 Recorded Sub Data Block
59
12.3 Margin Blocks, Preamble Blocks and Postamble Blocks
59
12.4 Spacer Blocks
59
13 Format of a track
59
13.1 Track capacity
60
13.2 Positioning accuracy
60
13.3 Tracking scheme
63
14 Layout of a Single Data Space tape
63
14.1 Device Area
64
14.2 Reference Area
64
14.3 Position Tolerance Band No. 1
64
System Area
14.4
64
14.4.1 System Preamble
64
14.4.2 System Log
64
System Postamble
14.43
64
Position Tolerance Band No. 2
14.4.4
64
14.4.5 Vendor Group Preamble
64
14.5 Data Area
64
14.5.1 Vendor Group
65
14.5.2 Recorded Data Group
65
14.53 ECC3
66
14.5.4 Multiple recorded instances
66
Repeated frames
14.5.5
66
14.5.6 Appending and overwriting
68
14.6 EOD Area
68
14.7 Post-EOD Area
69
14.8 Early Warning Point - EWP
69
14.9 Initialization
69
15 Layout of a partitioned tape
70
Overall magnetic tape layout
15.1
70
15.1.1 Device Area
70
15.1.2 Partition 1
vi
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IsOlIEC 12247:1993 (E)
151.3 Partition 0 71
15.2 Area ID 71
15.3 System Area Pack Items No. 3 and No. 4 71
15.4 Empty partitions 71
Initialization of partitioned tapes 72
15.5
16 Housekeeping Frames 72
16.1 Amble Frames 72
16.2 System Log Frames 72
16.3 Tape Management Frames 72
Annexes
A - Measurement of the light transmittance of the prisms 74
B - Recognition Holes 76
C - Means to open the lid 77
D - Measurement of light transmittance of tape and leaders
78
E - Measurement of Signal-to-Noise Ratio 81
F - Method for determining the nominal and the maximum allowable recorded levels 82
G - Representation of $-bit bytes by lo-bit patterns 83
M - Measurement of bit shift 89
J - Recommendations for transportation 92
K - Method of measuring track edge linearity
93
L - Read-After-Write 94
M - Example of the content of a Basic Group No. 0 95
N - Media Recognition System (MRS) 96
Vii
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ISO/IEC 12247: 1993 (E)
Foreword
IS0 (the International Organization for Standardization) and IEC (the Inter-
national Electrotechnical Commission) form the specialized system for worldwide
standardization. National bodies that are members of IS0 or IEC participate in
the development of International Standards through technical committees estab-
lished by the respective organization to deal with particular fields of technical
activity. IS0 and IEC technical committees collaborate in fields of mutual inter-
est. Other international organizations, governmental and non-governmental, in
liaison with IS0 and IEC, also take part in the work.
In the field of information technology, IS0 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. Publi-
cation as an International Standard requires approval by at least 75 % of the na-
tional bodies casting a vote.
International Standard ISO/IEC 12247 was prepared by the European Computer
Manufacturers Association (ECMA) (as Standard ECMA-170) 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 IS0 and IEC.
Annexes A, D, E, F, G, H and K form an integral part of this International
Standard. Annexes B, C, J, I,, M and N are for information only.
. . .
Vlll
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ISO/IEC 12247:1993 (E)
Introduction
ISO/IEC have produced a series of International Standards for cassettes and cartridges
containing magnetic tapes of different
width and characteristics. Of these, the following relate to helical scan recording.
ISO/IEC 10777: 199 1, Information technology - 3,81 mm wide magnetic tape cartridge for information interchange - Helical
scan recording - DDS format.
ISO/IEC 11319: 1993, Information technology - 8 mm wide magnetic tape cartridge for information interchange - Helical
scan recording.
ISO/IEC 11321:1992, Information technology - 3,81 wide magnetic tape cartridge for information interchange - Helical
scan recording - DATAIDATformut.
ISO/IEC 11557:1992, Information technology - 3,81 wide magnetic tape cartridge for information interchange - Helical
scan recording - DDS-DC format using 60 m and 90 m length tapes.
ISO/IEC 12246:1993, Information technology - 8 mm wide magnetic tape cartridge dual azimuth format for information
interchange - Helical scan recording.
ISO/IEC 12248:1993, Information technology - 3,81 wide magnetic tape cartridge for information interchange - Helical
scan recording - DATA/DAT-DC format using 60 m and 90 length tapes.
This International Standard is a further International Standard for the same recorded format as given in ISO/IEC 10777, but
which supports two types of cartridges. For Type A, the magnetic tape has a nominal thickness of 13 pm. For Type B, the
magnetic tape has a nominal thickness of 9 pm. This International Standard also includes the specifications of the Media
Recognition System, namely a striped splicing tape.
A companion International Standard ISO/IEC 11557 defines another data interchange specification for the same cartridges,
but with a recorded format, namely DDS-DC, which enables data to be compressed by the drive before being recorded.
ix
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INTERNATIONAL STANDARD ISO/IEC 1224731993 (E)
Information technology - 3,Sl mm wide magnetic tape cartridge for information
interchange - Helical scan resordi g - DDS format using 60 m and 90 m length tapes
Section 1 - General
1 Scope
This International Standard specifies the physical and magnetic characteristics of a 3,81 mm wide magnetic tape cartridge to
enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, the recorded format and the
recording method, thereby allowing data interchange between drives by means of such magnetic tape cartridges. The format
used is known as Digital Data Storage (DDS).
This International Standard specifies two types of cartridge which, for the purpose of this International Standard, are referred
toasTypeAandTypeB.
For Type A, the magnetic tape has a nominal thickness of 13 pm and a nominal length of up to 605 m.
For Type B, the magnetic tape has a nominal thickness of 9 urn and a nominal length of up to 92,0 m.
Information interchange between systems by means of this International Standard also requires the use, at a minimum, of a
labelling and fde structure and an interchange code which are agreed upon by the interchange parties. It is not within the
scope of this International Standard to specify the labelling and file structure, or the interchange code.
2 Confosmance
21 Magnetic tape cartridge
.
A tape cartridge shaIl be in conformance with this International Standard if it meets all mandatory requirements specified
herein for either Type A or Type B. The tape requirements shall be satisfied throughout the extent of the tape. A recorded
tape shall be either a Single Data Space Tape or a partitioned tape.
A claim of conformance shall state whether the optional feature for the Media Recognition System (MRS) is incorporated
(see annex N).
22 . Generating system
A system generating a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International
Standard if all recordings on the tape meet the mandatory requirements of this International Standard, and if either or both
methods of appending and overwriting are implemented.
A claim of conformance shall state whether cartridges of Type A or Type B or both are supported. In addition a cl& of
conformance shall also state which of the following optional features are implemented and which are not:
- the performing of a Read-After-Write check and the recording of any necessary repeated frames,
- the recording of multiple representations of the same Basic Group,
- the generation of ECC3 Frames.
A claim of conformance shall also state the differences in its operation, if any, which depend upon the presence, or absence,
of the MRS feature in the cartridge.
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ISO/IEC 12247: 1993 (E)
Receiving system
2.3
A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International
Standard if it is able to handle any recording made on the tape according to this International Standard. In particular it shall
be able:
-
to recognize repeated frames and to make available to the user data and Separator Marks from only one of these frames,
-
Basic
to recognize multiple representations of the same Group and to make available to the user data and Separator
Marks from only one of these representations,
-
to update the System Log(s) if the Write-inhibit Hole state so permits,
-
to recognize an ECC3 frame, and ignore it if the system is not capable of using ECC3 check bytes in a process of error
correction.
A claim of conformance shall state whether or not the system is capable of using ECC3 cheek bytes in a process of error
correction.
In addition a claim of conformance shall also state whether cartridges of Type A or Type B or both are supported.
A claim of conformance shall also state the differences in its operation, if any, which depend upon the presence, or absence,
of the MRS feature in the cartridge.
3 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this International
Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to
agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent
editions of the standards listed below. Members of XIX and IS0 maintain registers of currently valid International Standards.
ISO/R 527: 1966, Plastics - Determination of tensile properties.
IS0 1302:1992, Technical Drawings - Method of indicating surface texture.
EC 950: 1991, Safety of information technology equipment, including electrical business equipment.
4 Definitions
For the purposes of this International Standard, the following definitions apply.
4.1 Absolute Frame Number (AFN): A sequence number, encoded in the frame.
4.2 Area ID: An identifier defming the area of the tape and specifying the types of frame written.
4.3 Automatic Track Finding (ATF): The method by which tracking is achieved.
4.4 Average Signal Amplitude: The average peak-to-peak value of the output signal from the read head at the
fundamental frequency of the specified physical recording density over a minimum of 7,8 mm of track, exclusive ofm&ing
pulses.
azimuth: The angular deviation, in degrees, minutes and seconds of arc, made by the mean flux transition line with the
4.5
line normal to the centreline of the recorded track.
4.6 back surface: The surface of the tape opposite to the magnetic coating which is used to record data
4.7 byte: Ah ordered set of bits acted upon as a unit.
4.8 cartridge: A case containing magnetic tape stored on twin hubs.
4.9 Channel Bit: A bit after 8-10 transformation.
4.10 Data Format ID: An identifier specifying which data format is being used on the tape.
2
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ISO/IEC 12247:1993 (E)
4.11 Early Warning Point (EWP): A point along the length of the tape at which warning is given of the approach, in the
forward direction of tape motion, of the partition boundary or of the Physical End of Tape.
4.12 End of Data (EOD): The point on the tape at the end of the group which contains the last user data.
4.13 Error Correcting Code (ECC): A mathematical algorithm yielding check bytes used for the detection and correction
of errors.
4.14 flux transition position: That point which exhibits maximum free-space flux density normal to the tape surface.
4.15 flux transition spacing: The distance along a track between successive flux transitions.
4.16 frame: A pair of adjacent tracks with azimuths of opposite polarity, in which the track with the positive azimuth
precedes that with the negative azimuth.
4.17 Housekeeping Frame: A frame which contains no user data and which is identified as such by the values in the data
fields therein.
4.18 Logical Beginning of Tape (LBOT): The point along the length of the tape where a recording of data for interchange
commences.
4.19 magnetic tape: A tape which will accept and the magnetic signals in tended for input, output storage
purposes on computers and associated equipment.
4.20 Master Standard Amplitude Calibration Tape: A pre-recorded tape on which the standard signal amplitudes have
been recorded in the tracks of positive azimuth, 23,0 urn wide, at nominal track pitch, on an a.c.-erased tape.
NOTE 1 - The tape includes recordings made at 83,4 !Qnnm, 333,6 ftpmm, 500,4 ftpnm, 1081 ftpm and 1 SO1 ftpmm.
NOTE 2 - The Master Standad Amplitude CaWration Tape has been established by Sony Corporation.
4.21 Master Standard Reference Tape: A tape selected as the standard for Reference Recording Field, Signal Amplitude,
Resolution, Overwrite and Signal-to-Noise Ratio.
NOTE - The Master Standard Reference Tape has been established by Sony Corporation.
4.22 Optimum Recording Field: In the plot of Average Signal Amplitude against the recording field at the physical
recording density of 3 002 ftpmm, the field that causes the maximum Average Signal Amplitude.
along the length of a magnetic tape at which partition 1 ends and partition 0
4.23 partition bounda ry: The point
commences.
4.24 Physical Beginning of Tape (PBOT): The point where the leader tape is joined to the magnetic tape.
4.25 Physical End of Tape (PEOT): The point where the trailer tape is joined to the magnetic tape.
4.26 physical recording density: The number of recorded flux transitions per unit length of track, expressed in flux
transitions per millimetre (ftpmm).
4.27 pre-recording condition: The recording levels above which a tape intended for interchange shall not previously have
been recorded.
4.28 record: Related data treated as a unit of information.
Reference Recording Field: The Optimum Recording Field of the Master Standard Reference Tape.
4.29
430 Secondary Standard Amplitude Calibration Tape: A tape prerecorded as defined for the Master Standard
Amplitude Calibration Tape; the outputs are known and stated in relation to those of the Master Standard Amplitude
Calibration Tape.
NOTE - Secondary Standard Amplitude Calibration Tapes can be ordered from Sony Corporation, Audio Device Business Department, Component Marketing
Group, 4-10-18, Takanawa, Minato-ku, Tokyo 108, Japan, under Part Number TY-7000G until the year 2ooO. It is intended that these be used for calibrating
tertiary refenxxx taps for use in routine calibration.
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ISO/IEC 12247:1993 (E)
4.31 Secondary Standard Reference Tape: A tape the performance of which is known and stated in relation to that of the
Master Standard Reference Tape.
NOTE - Secondaxy Standard Reference Tapes can be or&md from Sony bpomtion, Ma&r Customer Division, Magnetic Products Group, 6-7-35, Kitashinagawa,
Shinagawa-ku, Tokyo 141, Japan, under Part Number RSD 1079 until the yw 2OOC). It is intended that these be used for calibrating tertiary refemce tapes for use
in routine calibration.
4.32 Separator Mark: A Record containing no user data, which is used to separate data.
4.33 Standard Reference Amplitude: The Average Signal Amplitude from the tracks of positive azimuth of the Master
Standard Amplitude Calibration Tape at a specified physical recording density.
4.34 Tape Reference Edge: The bottom edge of the tape when viewing the recording side of the tape, with the PEOT to
the observer’s right.
4.35 Test Recording Current: The current that produces the Reference Recording Field.
4.36 track: A diagonally positioned area on the tape along which a series of magnetic signals may be recorded.
437 Virtual End of Tape (VEOT): The point along the length of the magnetic tape within partition 1 which defines the
end of the part of partition 1 which is usable for recording dab for interchange.
5 Environment ancl safety
Unless otherwise stated, the conditions specified below sefer to the ambient conditions of the air immediately surrounding the
cartridge.
5.1 Testing environment
Unless otherwise stated tests and measurements made on the tape cartridge to check the requirements of this International
Standard shall be carried out under the following conditions:
: 23 “C k 2 T
temperature
: 40 % to 60 %
relative kmidity
: 24 h
conditioning period before testing
52 . Operating environment
Cartridges used for data interchange shall be capable of operating under the following conditions:
:5”Cto45”C
temperature
relative humidity : 20 % to 80 %
: 26 OC max.
wet bulb temperature
There shall be no deposit of moisture on or in the cartridge.
Conditioning before operating:
If a cartridge has been exposed during storage and/or transportation to a condition outside the above values, before use the
cartridge shall be conditioned in the operating environment for a time at least equal to the period during which it has been
out of the operating environment, up to a maximum of 24 h.
NOTE - Rapid variations of temperature should be avoided.
53 . Storage environment
For long-term or archival storage of cartridges the following conditions shall be observed:
temperature : 5 T to 32 T
relative humidity
: 20 % to 60 %
4
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ISOIIEC 12247: 1993 (E)
: 26 T max.
wet bulb temperature
The stray magnetic field at any point on the tape shall not exceed 4 000 A/m. There shall be no deposit of moisture on or in
the cartridge.
. Transportation
54
Recommended limits for the environment to which a cartridge may be subjected during transportation, and the precautions to
be taken to minimize the possibility of damage, are provided in annex J.
55 . Safety
The cartridge and its components shall satisfy the requirements of IEC 950.
Flammability
56 .
The cartridge and its components shall be made from materials, which if ignited from a match flame, do not continue to burn
in a still carbon dioxide atmosphere.
Section 2 - Requirements for the case
6 Dimensional and mechanical characteristics of the case
61 . General
The case of the cartridge shall comprise:
an upper half,
- a lower half,
- a slider movably mounted on the lower half,
- a lid pivotally mounted on the upper half.
In the drawings, using third angle projection, an embodiment of the cartridge is shown as an example.
Figure 1 is a perspective view of the cartridge seen from top,
Figure 2 is a perspective view of the cartridge seen from bottom.
is a partial view of the rear side.
Figure 3
Figure 4 is a schematic view showing the Reference Planes X, Y and Z.
Figure 5 shows the front side.
shows the top side with the lid in closed position.
Figure 6
Figure 7 shows the left side.
Figure 8 shows the top side with the lid in open position.
shows the left side with the lid in open position.
Figure 9
Figure 10 shows the bottom side with the lid and the slider in closed position.
Figure 11 shows the bottom side with the lid and the slider in open position.
Figure 12 is a view from the top of the inside of the lower half with the upper half removed.
is a view of the bottom half with the lid and the slider in open position.
Figure 13
is a view of the left side with the lid and the slider in open position.
Figure 14
Figure 15 is a top view of a hub.
Figure 16 is a side view of a hub with partial cross-section.
Figure 17 is a partial cross-section through a hub and both halves of the case showing the interface with the drive
spindle.
Figure 18 shows at a larger scale the lid in the open position.
Figure 19,20 show at a larger scale the functional relationship between the lid and the locking mechanism of the
hubs.
Figure 21,22 show the label areas on the top and the rear side.
The dimensions are referred to three orthogonal Reference Planes X, Y and Z (figure 4).
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lSO/IEC 12247: 1993 (E)
Overall dimensions
62 .
See figures 6 and 7.
The overall dimensions of the case with the lid in the closed position shall be:
L, = 73,0 mm * 0,3 mm
mm
4 = 54,0 mm * 0,3
4 = lo,5 mm * 0,2 mm
The edges formed by the rear side and the left and right sides shall be rounded off with a radius
R, = 1,5 mm max.
The two edges of the lid shall be rounded off with a radius
R, = 0,5 mm max.
Loading grip
63 .
See figure 6.
The top side shall have a loading grip for loading and positioning the cartridge into the drive. The position and dimensions of
the loading grip shall be
La = 25,5 mm i 0,3 mm
L, = 10 mm min.
Ls = 5,0 mm * 0,2 mm
4 = 2,0 mm min.
The depth of the loading grip below the surface of the top side shall be
0,5 mm +02~
- 0,o
64 . Holding areas
See figure 6.
The two areas shown shaded in figure 6 shall be the areas along which the cartridge shall be held down when inserted in the
drive. Their positions and dimensions shall be
L, = 6,0 mm k 0,l mm
4 = 5,0 mm * 0,l mm
65 . Notches of the lid
See figures 5 and 8.
The lid shall have two pairs of notches.
The first pair of notches, the slider lock release notches, allows elements of the drive to release the locking mechanism of the
slider. The positions and dimensions of these notches shall be
L,, = 0,4 mm max.
L,, = 3,0 mm min.
L 12=1~mmf0,1mm
L 13 = 49,8 mm & 0,2 mm
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ISO/IEC 12247: 1993 (E)
The second pair of notches, the slider movement notches, allows elements of the drive to move the slider from the closed to
the open position (see also 6.8.1). The positions and dimensions of these notches shall be
L,, = 3,0 mm min.
L 14 = 0,9 mm min.
L15 = 73 mm * 0,l mm
L 16 = 36,OO mm k O,I5 mm
66 . Lid dimensions
See figures 6 to 8.
The lid is shown in the closed position in figure 6 and 7. Its dimensions shall be
L,, = 12 mm * 0,l mm
L,, = 6,8 mm * 0,4 mm
L,, = I,1 mm * 0,l mm
ho = 2,0 mm * 0,l mm
b1 = 6,4 mm f: 0,2 mm
~2=l~mmf0,1mm
R, = 6,8 mm * 0,4 mm
The lid shall have a chamfer of 45’ by
There shall be a dimensional relationship between the height b4 shown in figure 7, which includes the slider and the upper
half, and the height hs of the lid. When a vertical force of 1 N is exerted on the upper half the following condition shall be
met.
b4 = 10,5 mm * 0,2 mm
When no force is exerted
h4 = 10,9 mm max.
In figure 8 the lid is shown in the open position. The distance from the front edge of the lid to the rear side shall be
& = 55,s mm f: 0,3 mm.
67 l Optical detection of the beginning and end of tape
See figures 9 and 12.
Means for the optical detection of the beginning and end of tape shaI1 be provided. These shall consist of a pair of windows
on the left and right sides of the case (see also figure 18). The design of these windows allows this detection for two different
drive designs:
-
either a light source and a detector are provided in the drive on each side of the cartridge, in which case the light enters
the case through the upper windows, falls on a prism (see section A-A) mounted inside the case, which reflects this light
so that it goes
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