ISO/IEC 11321:1992
(Main)Information technology — 3,81 mm wide magnetic tape cartridge for information interchange — Helical scan recording — DATA/DAT format
Information technology — 3,81 mm wide magnetic tape cartridge for information interchange — Helical scan recording — DATA/DAT format
Specifies the physical and magnetic characteristics and also the quality of the recorded signal, the recorded format (DATA/DAT) and the recording method, thereby allowing data interchange between drives by means of such magnetic tape cartridges.
Technologies de l'information — Cartouche de bande magnétique de 3,81 mm de large pour l'échange d'information — Enregistrement hélicoïdal — Format DATA/DAT
General Information
Standards Content (Sample)
INTERNATIONAL IISO/IEC
11321
STANDARD
First edition
1992-12-15
Information technology - 3,81 mm wide
magnetic tape cartridge for information
- Helical scan recording -
interchange
DATA/DAT format
Cartouche de bande magnetique de
Technologies de I ’informa tion -
3,81 mm de /arge pour Mchange d ’information - Enregistrement
h6licoidal - Format DATA/DAT
--
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E g
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Reference number
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-GE- -
ISO/IEC 11321 :1992(E)
- --
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ISO/IEC 11321:1992 (E)
Contents
Section 1 : General
1 Scope
2 Conformance
2.1 Magnetit tape cartridge
2.2 Generating System
2.3 Receiving System
3 Normative references
4 Definitions
Absolute Frame Number (AFN)
4.1
4.2 AC erase
Area ID
4.3
Automatic Track Finding (ATF)
4.4
Average Signal Amplitude
4.5
azimuth
4.6
back surface
4.7
4.8 byte
4.9 cartridge
4.10 Channel bit
4.11 Data Format ID
4.12 End of Data (EOD)
End of Information (EOI)
4.13
4.14 End of Partition (EOP)
4.15 Error Correcting Code (ECC)
flux transition Position
4.16
o ISO/IEC 1992
All rights reserved. No part of this publication may be reproduced or utilized in any form or
by any means, electronie or mechanical, including photocopying and microfilm, without per-
mission in writing from the publisher.
I SO/I EC Copyright Office l Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland
ii
---------------------- Page: 2 ----------------------
ISO/IEC 11321:1992 (E)
2
l 4.17 flux transition spacing
2
4.18 frame
2
4.19 gro u p
2
4.20 Logical Reginning of Tape (IBOT)
2
4.21 Logical End of Tape (LEOT)
2
4.22 magnetic tape
2
4.23 Master r-eference
2
4.24 Master Standard Amplitude Calibration Tape
2
4.25 Master Standard Reference Tape
2
4.26 Optimum recording field
2
4.27 partition
3
4.28 partition reference
3
4.29 Physical ßeginning of Tape (PRO ’T ’)
3
4.30 Phvsic;ll End of Tape (PEOT)
M
3
4.31 physical recording density
3
pre-recording condition (maximum recorded levels)
4.32
3
4.33 r-em rd
3
4.34 Reference Recording Field
3
4.35 Secondary Standard Amplitude (Xibration Tape
3
4.36 Secondary Standard Reference Tape
3
sepa i-3 tor
4.37
3
Standard Reference Amplitude
4.38
3
4.39 tape nclise amplitude
3
4.40 Tape Reference Edge
3
4.41 track
3
Environment and safety
5
3
5.1 Testing environment
3
5.2 Operating environment
4
5.3 Storage environment
4
5.4 Transportation
4
5.5 Safety
4
5.6 Flammability
Section 2 : Requirements for the case
Dimensional and mechanical characteristics of the case
6
General
6.1
Overall dimensions (figures 6 ;rnd 7)
6.2
l.,oading grip (figure 6)
6.3
Holding areas (figure 6)
6.4
Notches of the lid (figures 5 and 8)
6.5
6.6 Lid dimensions (figures 6 to 8)
6.7 0ptic;tl detection of the beginning ;tncl end of tape (figure 9 and 12)
6.8 Bottom side (figures IO ;~nd 1 1)
7
6.8.1 Locking mech;rnism of the sliclcr
8
6.8.2 Access holes
8
6.8.3 Recognition. subd:ltum mtl write-inhibit holes
10
Dr1 t 11 m hob
6.8.4
. . .
Ill
---------------------- Page: 3 ----------------------
ISO/IEC 11321:1992 (E)
10
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 (figure 12)
12
Light path (figure 12)
6.8.8
12
6.8.9 Support areas (figure 13)
12
6.8.10 Datum areas (figure 13)
13
6.8.11 Relationship between support and Datum Areas and Reference Plane 2 (figure 14)
13
6.9 Hubs (figures 15, 16)
13
6.10 Leader and trailer attachment
13
6.11 Interface between the hubs and the drive spindles (figure 17)
14
6.12 Opening of the lid (figure 18)
14
6.13 Release of the hub locking mechanism (figures 19, 20)
14
6.14 Label area (figures 21, 22)
25
Section 3 : Requirements for the unrecorded tape
25
7 Mechanical, physical and dimensional characteristics of the tape
25
7.1 Materials
25
Tape iength
7.2
25
Length of mngnetic tnpe
7.2.1
25
Length of leader and trailer tnpes
7.2.2
25
7.3 Tape width
25
7.4 Discontinuities
25
7.5 Total thickness
25
7.6 l L,ongitudinni curvature
25
7.7 Cupping
26
7.8 Co;\ ti ng ad hesion
26
7.9 Layer-to-layer adhesion
26
7.10 Tensile strength
26
7.10.1 Breaking strength
26
7.10.2 Y ield strength
27
7.11 Residual elongation
27
7.12 Electrical resistance of coated surfaces
28
Light transmittance of tape
7.13
28
8 Magnetit recording characteristics
28
Optimum recording field
8.1
28
8.2 Signal Amplitude
29
Resolution
8.3
29
Overwrite
8.4
29
3 002 ftpmm
Physical Recording Densities of 750,h and
8.4.1
29
and 1 001 ftpmm
densities of 83,4 ftpmm
8.4.2 Physical recording
30
Ease of erasure
8.5
30
8.6 Tape quality
30
8.6.1 Missing pulses
30
8.6.2 Missing pulse Zone
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ISO/IEC 11321:1992 (E)
30
8.7 Signal-to-noise ratio (S/N) charncteristic
30
Section 4 : Format
30
9 DATA/DAT formst
30
9.1 Genera 1
31
9.2 Basic G rou ps
31
9.2.1 Basic Groups for Group Format 0
32
9.2.2 Basic Groups for Group Format 1
33
9.3 Sub-Groups
33
9.3.1 G 1 Sub-group
34
9.3.2 G2 Sub-group
34
9.3.3 G3 Sub-group
35
9.3.4 G4 Sub-gmup
40
9.3.5 Main Data Block
42
9.4 Sub-Data area
42
9.4.1 Pack Item No. I
43
9.4.2 Pack Item No. 2
45
9.4.3 Pack ltem No. 3
46
9.4.4 Pack Item No. 4
47
9.4.5 Pack Item No. 5
48
9.4.6 Pack ltem No. 6
49
9.4.7 Pack Item No. 7
49
Sub Data Block
9.4.8
51
Basic Group structure
9.5
52
User Data
9.51
52
System Data
9.5.2
56
Record 1 I-1 list
9.5.3
60
9.5.4 1 Ieuristic Recovery Data AI-e;]
60
10 Method 01‘ recording
60
10.1 Physical recording density
60
10.2 Lang-Term average bit cell lengt h
60
10.3 Short-Term average bit cell length
60
10.4 Rate of change
60
10.5 Bit shift
60
10.6 Read Signal amplitude
60
10.7 Maximum recorded levels
60
Track geomet ry
11
60
11.1 Track configuration
61
Average track pitch
11.2
61
Variations of the track pitch
11.3
61
Track width
11.4
62
Trat k angle
11.5
62
Track edge Iinearity
11.6
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ISO/IEC 11321:1992 (E)
62
11.7
Track lengt h
62
11.8 Ideal tape centreline
62
11.9 Azimuth angles
62
12 Recording of blocks on the tape
62
12.1 Recorded Main Data Block
62
12.2 Recorded Sub Data Block
62
12.3 Margin Blocks, Preamble Blocks and Postnmblc Blocks
62
12.4 Spacer Blocks
62
Format of a track
13
62
13.1 Track capacity
63
13.2 Positioning accurncy
63
Tracking scheme
13.3
66
14 Group Formats
66
14.1 Group Format 0
66
14.2 Group Format 1
67
Extended Gap Frames
14.3
67
Extended 1 -eading Gap Frames
14.3.1
67
14.3.2 Extended Trailing Gap Frames
67
14.4 Types of Groups
68
14.4.1 Normal Groups
68
13.4.2 Spare Groups
68
14.4.3 Amhle Grwps
69
15 Magnetit tape layout
69
Load/U nload Area
15.1
70
Lead-in Area
15.2
70
Preamble
15.2.1
70
15.2.2 Meader
72
Format Parameter Set
15.2.3
77
15.2.4 Master Reference
83
Postamble
15.2.5
84
15.3 Partition
84
15.3.1 Partition Preamble
84
15.3.2 Partition Reference
96
15.3.3 Partition Postamble
96
Partition Data
15.3.4
97
End of Partition (EOP)
15.3.5
97
Unused Area
15.3.6
97
15.4 EO1
97
15.5 Repeated Groups
98
15.6 Repeated Frames within a Normal Group
98
15.7 Relocation of Defect ive G t-OLIIX
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ISO/IEC 11321:1992 (E)
98
15.8 Appending
99
15.8.1 Semtless appending
100
15.8.2 Non-semmless appending
101
15.9 Ova-wt-i te (figu t-e 83)
102
15.9.1 OW-lapped tt-ack width
102
15.9.2 Non-ovet-lnpped track width
102
15.9.3 Rules fm- ovet-write
Annexes
103
A Measurement of the light transmittance of the prisms
105
n
Recogn i t ion Holes
106
Means for opening the lid
c
107
D Measurement of light transmiltance of tape and leaders
110
E Mcasurement of Signal-to-Noise Ratio
111
F Method for determining the nominal and the maximum allowable recorded levels
112
Representation of g-bit bytes by 10.bit Pattern
G
118
H Measurement of bit shift
121
Recommendations for transportat ion
J
122
K Method of measuring track edge linearity
123
L Read-After-Write
124
M Data allocation and C3 parity
vii
---------------------- Page: 7 ----------------------
ISO/IEC 11321:1992 (E)
Foreword
ISO (the International Organization for Stnndardization) and IEC (the International Eiectrotechnicai
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 estabiished
by the respective organization to deal with particuiar fieids of technical activity. ISO and IEC technicai
committees collaborate in fieids of mutual interest. Other international organizations, governmental and non-
governmentai, in liaison with ISO and IEC, also take part in the work.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTCl.
Draft International Standards adopted by the joint aechnical committee at-e circulated to national bodies for
voting. Publication as an International Standard requires npproval by at least 75 a/o of the national bodies casting
a vote.
International Standard ISO/IEC % 1,321 was prepared by the European Computer Manufacturers Association (as
Standard ECMA-146) and was adopted, under a special “fast-track procedure ”, by Joint Technical Committee
lSO/IEC JTCI, Infi>rn&on tc&z&qy, in parallel with its approval by national bodies of ISO and IEC.
Annexes A, D, E, F, (3, I-l, K and M form an integral part of this International Standard. Annexes B, C, J and L
are for information only.
Patents
During the prepnration of the ECMA Standard, information was gathered on Patents upon which application of
the Standard might depend. Relevant Patterns were identified as belonging to Hitschi and the Sony Cvrporation.
However, neither ECMA nor ISO/IEC tan give authoritative or comprehensive information about evidente,
validity or scope of patent and like rights. The patent hoiders have stated that licences will be granted under
reasonabie and non-discriminatory terms. Communications on this subject shouid be addressed to
Hitschi, Ltd.
European Operation Centre
Wallhrook Busi ness Centre
G reen 1 *a ne
Hounslow TW3 hN W
United Kingdom
Sony Corporafion
Licensing and Tradema i-k Division
h-7-3 Kitashinagawa
Shinagawa-ku
Tokyo 131
Japan
. . .
Vlll
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INTERNATIONAL STANDARD ISO/IEC 11321:1992 (E)
Information technology - 341 mm wide magnetic tape cartridge for information
interchange - Helical scan recording - DATA/DAT format
Section 1 : General
1 Scope
This International Standard specifies the physical and magnetic characteristics of a 3,8i mm wide magnetic tape
cartridge to enable interchangeability of such cartridges. It also specifies the quaiity of the recorded Signals, and
the formal and recording method, thereby allowing data interchange by means of such magnetic tape cartridges.
2 Conformance
2.1 Magnetit tape cartridge
A tape cartridge shall be in conformance with this International Standard if it meets all mandatory requirements
specified herein. The tape requirements shail be satisfied throughout the extent of the tape.
2.2 Generating System
A System generating ;1 magnetic tape cartridge for interchange shail be entitled to Claim conformance to this
international Stand;u-d if all recordings on the tape meet the mandatory requirements of this International
Standard.
2.3 Receiving System
A system receiving ;i mngnetic tape cartridge for interchange shail be entitied to Claim conformance with this
International Str~ndar-d if it is able to handle any recording made on the tape according to this International
Standard.
3 Normative Keferences
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 vaiid. 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 iisted beiow. Members of IEC and ISO maintain
registers of currently vaiid International Standards.
ISO/R 527: 1966, I ’lusiics - Determination of tensile properties
ISO 7-bit coded Character set for information interchange.
ISO/IEC 646: 199 1, Information technology -
Method of indicating surface texture on drawings
ISO 1302: 1978, Technical Drawings -
1 EC 950: 1990, Safety of Information Technology Eyuipment, including Electrical Business Eyuipmenr
4 Definitions
For the purpose of this International Standard, the foiiowing definitions appiy.
4.1 Absolute Frame Number (AFN): A sequence number aiiocated to, and recorded in, each frame.
4.2 AC erase: A process of erasure utilizing alternating fieids of decaying ievei.
4.3 Area ID: An identifier for each area of the tape specifying the types of frame written therein.
4.4 Automatic Track Finding (ATF): A method by which tracking is achieved.
---------------------- Page: 9 ----------------------
ISO/IEC 11321:1992 (E)
4.5 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
of missing pulses.
4.6 azimuth: The angular deviation, in degrees, minutes and seconds of arc, made by the mean flux transition
line with the line normal to the centreline of the recorded track.
4.7 back surface: The surface of the tape opposite to the magnetic coating which is used to record data.
4.8 byte: An ordered set of bits acted upon as a unit.
4.9 cartridge: A case containing magnetic tape stored on twin hubs.
4.10 Channel bit: A bit after Wo- IO transformation.
4.11 Data Format ID: An identifier specifying which data format is being used on the tape.
4.12 End of Data (EOD): The point where the host stopped writing data on the tape.
4.13 End of Information (EO]): A group which indicates the end of partition area in a tape.
4.14 End of Partition (EOP): A group which indicates the end of data area in a partition.
4.15 Error Correcting Code (ECC): A mathematical algorithm yielding check bytes used for the detection and
correction of errors.
4.16 flux transition Position: That point which exhibits maximum free-space flux density normal to the tape
sur-face.
4.17 flux transition spacing: The distance along a track between successive flux transitions.
4.18 frame: A pair of adjacent tracks with azimuth of opposite polarity, in which the track with the positive
azimuth precedes that with the negative azimuth.
4.19 group: A number of frames constituting a recorded unit.
4.20 Logical Beginning of Tape (LBOT): The Point nlong the length of the tape where the recording of data for
interchange commences.
4.21 Logical End of Tape (LEOT): A Point along the length of the tape which indicates the approach, in the
direction of tape motion, of the partition boundary or physical end of tape.
retain magnetic Signals intended for input, output, and storage
4.22 magnetic tape: A tape which will accept and
purposes on Computers and associated equipment.
4.23 Master reference: The area which contains partition information in the tape.
4.24 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 ym wide, at nominal track pitch, on an AC-
erased tape-
Note I - The tape includes recordings rnade at 83,4 ftpmm, 333.0 ftpmm, 5W,3 ftpmm, I 001 ftpmm and 1 501 ftpmm.
Note 2 - The Master Standard Amplitude Calibration Tape has been established by the Sony Corporation.
4.25 Master Standard Reference Tape: A tape selected as the Standard for Reference Recording Field, Signal
Amplitude, Resolution Overwrite and Signal-to-Noise Ratio.
Note 3 - The Master Standard kference Tape has been rstahlished by the Sony Corporation.
4.26 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.
4.27 partition: Partition of a tape in which user data is recorded.
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ISO/IEC 11321:1992 (E)
4.28 partition reference: The area which contains group information in the partition.
4.29 Phycical . Beginning of Tape (PBOT): The point where the leader tape is joined to the magnetic tape.
4.30 Physical End of Tape (PEOT): The point where the trailer tape is joined to the magnetic tape.
in
4.31 physical recording density: The number of recorded flux transitions per unit length of track, expressed
flux transitions per millimetre (ftpmm).
4 . 32 pre-recording condition (maximum recorded levels): The recording levels above which a tape intended for
interchange sh;rll not previously have been recorded.
4.33 record: Kelated data treated as a unit of information.
4.34 Reference Recording Field: The optimum recording field of the Master Standard Reference Tape.
4.35 Secondary Standard Amplitude Calihration Tape: A tape pre-recorded as defined for the Master Standard
Amplitude C;Wration Tape; the outplus of which at-e known and stated in relation to that of the Master
Standard Amplitude Cnlibration Tape.
‘Tape tan be ordered from the Sony Corporation, Audio Device Business
Note 3 - Tbc Secondary Standard Amplitude Calibration
Department. Component Marketin, (1 Group -I-IO-l& ‘Takanawa. Minato-ku, Tokyo 108, Japan, under Part Number TY-7oW G until the
year 2001. lt is intended that these be used for calibratin g tertiary tapes for use in routine calibration.
Performance of which is known and stated in relation to
4.36 Secondary Standard Reference Tape: A tnpe the
that of the Master Standard Reference Tape.
Note 5 - A Srcondary Standard Keference Tape tan be ordered from the Sony Corporation, Audio Device Business Department,
Component Mnrheting Group 4-W 18. Takanawa, Minato-hu, Tokyo 108, Japan, under Part Number RSD lO7cI until the year 2001. lt is
intended that these be used for calibrating tertiary tapes for use in routine calibration.
4.37 separator: A record containing no user data, which is used to separate data.
4.38 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.
4.39 tape noise amplitude: The tape noise amplitude is the subtractive value of amplifier noise from total noise
in root mean sqiiare (rms).
4.40 Tape Reference Edge: The bottom edge of the tape when viewing the recording side of the tape with the
PE0T of the tape to the observer ’s right.
4.41 track: A diagonally positioned area on the tape along which a series of magnetic Signals may be recorded.
5 Environment and safety
Unless otherwise stated, the conditions specified helow refer to ambient conditions in the air immediately
surrounding the cartridge.
5.1 Testing environment
Unless otherwise stnted, 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 2 2 “C
temperature
: 40 % to 60 %I
relative humidity
: 24h
conditioning period before testing
5.2 Operating environment
Cartridges used for data interchange shall he capable of operating under the following conditions:
3
---------------------- Page: 11 ----------------------
ISWIEC 11321:1992 (E)
temperature : 5 “C to 45 “C
relative humidity l . 20 96 to 80 5%
wet bulb temperature : 26 “C max.
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 h - Rapid vwiations of temperaturc should be avoidcd.
5.3 Storage environment.
For long term or archived storage of cartridges the following conditions shall be observed:
: 5 “C to 32 OC
temperature
relative humidity - . 20 5% to 60 %
maximum wet bulb temperature : 26 “C max.
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.
5.4 Transportat ion
Recommended limits for t .he environme nt to whic h a cartrid ay be subjected duri ng transportation, and the
ge m
precautions to he taken to minimize the possi bility of damage , are provided in annex J.
5.5 Safety
The cartridge and its components shall sntisfy the requirements of 1EC WO.
5.6 Flammability
material which, if ignited from a match flame, do not
The cartridge and its components shall be made from
continue to burn in a still carbon dioxide atmosphere.
Section 2 . Requirements for the case
6 Dimensional and mechanical characteristics of the case
6.1 General
The case of the cartridge shall comprise
- an upper half- a lower half,
- a slider moveably 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 the top.
Figure 2 is a perspective view of the cartridge seen from the bottom.
Figure 3 is a partial view of the rear side.
Figure 4 is a schematic view showing the Reference Planes X, Y, and 2.
Figure 5 Shows the front side.
Figure 6 Shows the top side with the lid in closed position.
Figure 7 Shows the Ieft side.
---------------------- Page: 12 ----------------------
ISO/IEC 11321:1992 (E)
Figure 8 Shows the top side with the lid in open Position.
Figure 9 Shows the left side with the lid in open Position.
Figure 10 Shows the bottom side with the lid and the slide 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.
Figure 13 is a view of the bottom half with the lid and the slider in open Position.
Figure 14 is a view of the left side with the lid and the slider in open Position.
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 Iahe1 areas on the top and the rear Gde.
The dimensions are referred to three orthogonal Reference Planes X, Y, and 2 (figure 4).
6.2 Overall dimensions (figures 6 and 7)
The Overall dimensions of the case with the lid in the closed Position shall be
= 73,0 mm + 0,3 mm
LI
Lz = 54,0 mm 2 0,3 mm
= 10,5 mm t 0,2 mm
L3
The edges formed by the real- side and left and right sides shall be rounded off with a radius
= 1,5 mm mrix.
Rl
The two edges of the lid shall he rounded off with a radius
RZ = 0,5 mm max.
6.3 Loading grip (figurc 6)
The top side shail have a loading grip for loading and positioning the cartridge into the drive. The Position and
dimensions of the loading grip shall be
= 25,5 min t 0,3 mm
L4
= 10 rm-n min.
145
L = 5,O mni + 0,2 mm
Ab
L-7 = 2,0 mm min.
The depth of the loading grip helow surface of the top side shall he
+ 0,2
mm
0.5 mm
- 0,o
6.4 Holding areas (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
= 6,O mm t 0,l mm
L-x
= 5,0 mm & 0,l mm
Lu
---------------------- Page: 13 ----------------------
ISO/IEC 11321:1992 (E)
6.5 Notches of the lid (figures 5 and 8)
The lid shall have two pairs of notches.
allows elements of the drive to release the locking
The first pair of notches, the slider leck release notches,
mechanism of the slider. The positions and dimensions of these notches shall be
0,4 mm max.
LIO =
-
-
$0 mm min
= 1,2 mm + 0,l mm
L12
= 493 mm + 0,2 mm
L-13
The second pair of notches, the slider movement notches, allows elernents of the drive to rnwe the sli&r from
closed to open Position (see also 63.1). The positions and dimensions of these notches shall he
-
-
3,0 mm min.
LII
= 0,9 mm min.
hl
= 7,5 mm & 0,l n-rm
LIS
36,OO mm + 0,15 mm
h, =
6.6 Lid dimensions (figures 6 to 8)
The lid is shown in closed position in figure 6 and 7. lts dimensions shall be
-
-
1.2 mm 2 0,l mm
L17
-
-
Cd mm 2 0,3 mm
Ll%
Ld 10 = 1.1 mm 2 0,l mm
-
-
2.0 mm k 0,l mm
1-N
= 6,4 mm t 0,2 mm
h
L-2 = 1,5 mm +, 0,l mm
-
-
6,s mm + 0,4 mm
R3
The lid shall have a chamfer of 45” with a length of
= 1,5 mm f 0,l mm
L23
There shall be a dimensional relationship between the height L74 shown in figure 7, which includes the slider and
25 of the lid. When a vertical forte of 1 N is exerted on the upper half the
the upper half, and the height L
following conditions shall be met
= 10,5 mm + 0,2 mm
L23
When no forte is exerted
= 10,9 mm max.
L24
In figure 8 the lid is shown in open Position. The distance from the front edge of the lid to the rear side shall be
= 55,5 mm k 0,3 mm
L2h
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ISO/IEC 11321:1992 (E)
6.7 Optical detection of the beginning and end of tape (figure 9 and 12)
Means for the Optical detection of the beginning and end of tape shall 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 lieht so that it goes through the tape and falls on the detector
through the lower window; the light transmittance of the prism shall be greater than 50 % of that of a
reference prism when measured as specified in annex A,
- or, the light of a light Source within the drive Passes through the tape from inside the cartridge and
falls through the lower windows on to the detectors placed on each side of the
The positions and dimensions of these windows allow the cartridge to be used with drives implementing either
System, they s ball be
= 6,20 mm + 0,lO mm
b7
= 7,65 mm + OJO mm
L2x
+ 0,20
L'C, = 1,50 mm mm
- 0,oo
= 3,9 mm + 0,l min
kW
= 1,8 mm + 0,l mm
L31
= 7,0 mm L- 0,2 mm
L32
= 2,5 mm min.
L33
Dimension L32 specifies the Position of the rear edge of the windows relative to Reference Plane Y. Dimension
L33 shall be measured relative to this rear edge.
6.8 Bottom side (figures 10 and 11)
The bottom side is show n in figure 10 with the lid and the slider in c Position and in figure 11 with both in
the open Position.
The dimension LJJ of the bottom half, L,~T of the slider and L 36 of the lid shall satisfy the following conditions
- - s
= 73,O mm + OJ mm
L3-4
L3s 5 l-3-l
L30 s L3-1
6.8.1 Locking mechanism of the slider
The cartridge shall have a locking mechanism for the slider which locks it in the closed and open positions. The
design of this mechanism is not specified by this International Standard, except for the different forces acting on
the slider, and for its detent.
The slider shall be spring-loaded by a spring holding it in closed Position when it is unlocked. The forte required
to operate the slider shall not exceed 2 N.
The slider shall have two grooves with an opening at both ends. The detent of the locking mechanism shall
protrude through these openings so as to hold the slider in both open and closed positions. The detent shown in
Cross section C-C is only an example of implementation.
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ISWIEC 11321:1992 (E)
‘The grooves are parallel to Reference Plane 2 and aligned with the slider leck release notches of the hd. The
positions and dimensions of the grooves and of the openings for the detent of the locking mechanism when the
slider is in the closed Position shall be
1,2 mm f: 0,l mm
L37 =
= 49,8 mm If: 0,2 mm
L3x
= 10,O mm t 0,l mm
L30
+ 0,s
= 2,0 mm mm
L40
- 0,l
-
-
3,O mm min.
L41
= 1,s mm min.
L42
= 0,8 mm + 0,l mm
L43
+ 0,5
= 0,8 mm mm
L44
- 0,l
x
= 45” min.
= O,h5 mm If: 0,05 mm
L45
The Position and dimensions of the openings for the detent when the slider is held in the open Position are
determined by LJC), L.l(j, Ldj, and
- L44-
In the closed Position of the slider, the maximum forte to be exerted on the detent in a direction perpendicular
to Reference Plane 2 and over a stroke of 0,65 mm shall be 0,5 N max.
In the open Position of the slider the holding forte shall be OJ N min.
6.8.2 Access holes
The slider shall have two circular access (see section B-B) which, in the open Position of the slider, allow
Penetration of the drive spindles into the hubs. The diameters of these access holes shall be
= 10,O mm + 0,2 mm
4
= 12,0 mm max.
dz
6.8.3 Recognition, sub-datum and write-inhibit
...
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