ISO/IEC 12248:1993
(Main)Information technology — 3,81 mm wide magnetic tape cartridge for information interchange — Helical scan recording — DATA/DAT-DC format using 60 m and 90 m length tapes
Information technology — 3,81 mm wide magnetic tape cartridge for information interchange — Helical scan recording — DATA/DAT-DC format using 60 m and 90 m length tapes
La présente Norme internationale spécifie les caractéristiques physiques et magnétiques d'une cartouche à bande magnétique de 3,81 mm de large, dans le but de permettre l'interchangeabilité de telles cartouches. Elle spécifie également la qualité des signaux enregistrés, le format enregistré et la méthode d'enregistrement, permettant ainsi l'échange de données entre lecteurs-enregistreurs au moyen de telles cartouches à bande magnétique. Le format utilisé est connu sous l'appellation : DATA/DAT-DC. La présente Norme internationale spécifie deux types de cartouche. Pour les besoins de la norme, ces cartouches sont référencées comme type A et type B. Pour le type A, la bande magnétique présente une épaisseur nominale de 13 µm et une longueur nominale de 60,5 m. Pour le type B, la bande magnétique présente une épaisseur nominale de 9 µm et une longueur nominale de 92,0 m. L'échange d'information entre systèmes au moyen de la présente Norme internationale exige aussi l'utilisation, au minimum, d'une structure de volumes et de fichiers et d'un code d'échange qui doivent être acceptés par les parties concernées dans l'échange. Il n'est pas du domaine d'application de la présente Norme internationale de spécifier la structure de volumes et de fichiers, ou le code d'échange.
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 DATA/DAT-DC utilisant des bandes de 60 m et 90 m de long
General Information
Standards Content (Sample)
ISO/IEC
INTERNATIONAL
12248
STANDARD
First edition
1993-12-15
Information technology - 3,81 mm wide
magnetic tape cartridge for information
interchange - Helical scan recording -
DATA/DAT-DC format using 60 m and
90 m length tapes
- Cartouche de bande magnetique de
Technologies de I’information
3,$1 mm de /arge pour Mchange d’information - Enregistrement par
Format DATA/DAT-DC utilisant des bandes
balayage en spirale -
de 60 m et 90 m de long
Reference number
ISO/IEC 12248: 1993(E)
---------------------- Page: 1 ----------------------
ISOIIEC 12248: 1993 (E)
Page
Contents
1 Scope
2 Conformance
Magnetit tape cartridge
21 .
22 . Generating System
Receiving System
23 .
3 Normative references
2
Definitions
4
2
4.1 Absolute Frame Number (AFN)
2
algorithm
42 l
2
43 Area ID
2
4:4 Automatic Track Finding (ATF)
2
45 . Average Signal Amplitude
2
azimuth
46
2
4:7 back surface
2
48 . byte
2
49 cartridge
2
4’10 Channel Bit
2
4’11 Codeword
2
4’12 Data Format ID
2
4’13 End of Data (EOD)
2
End of Information (EOI)
4’14
2
4’15 End of Partition (EOP)
2
4’16 enti ty
2
4’17 Error Correcting Code (ECC)
2
4’18 flux transition Position
2
4’19 flux transition spacing
2
4’20 frame
2
4’21
group
2
4’22 e 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, electronie or mechanical, including
photocopying and microfilm, without Permission in writing from the publisher.
ISO/IEC Copyright Office l Case postale 56 l CH-121 1 Geneve 20 l Switzerland
Printed in Switzerland
---------------------- Page: 2 ----------------------
ISO/IEC 12248: 1993 (E)
4.23 Logical End of Tape (LEOT)
2
4.24 magnetic tape 3
master reference
4.25 3
4.26 Master Standard Amplitude Calibration Tape 3
4.27 Master Standard Reference Tape
3
4.28 Optimum Recording Field 3
4.29 partition 3
4.30 partition reference 3
4.31 Physical Beginning of Tape (PBOT) 3
4.32 Physical End of Tape (PEOT) 3
4.33 physical recording density 3
4.34 pre-recording condition 3
4,35 processed record 3
4.36 processed record sequence 3
4.37 processing 3
3
4.38 record
4.39 Reference Recording Field 3
4.40 Secondary Standard Amplitude Calibration Tape 3
4.41 Secondary Standard Reference Tape 3
4.42 Separator Mark 3
4.43 Standard Referemce Amplitude 4
4
4.44 tape noise amplitude
4.45 Tape Reference Edge 4
4
4.46 track
5 Environment and safety 4
Testing environment
51 .
52 . Operating environment
53 . Storage environment
54 . Transportation
Safety
55 .
56 . Flammability
Section 2 - Requirements for the case
6 Dimensional and mechanical characteristics of the case
.
61 General
62 . Overall dimensions
63 . Loading grip
64 . Holding areas
. Notches of the lid
65
66 . Lid dimensions
67 . Optical detection of the beginning and end of tape
68 . Bottom side
6.8.1 Locking mechanism of the slider
6.8.2 Access holes
6.8.3 Recognition, sub-datum and write-inhibit holes
6.8.4 Datum holes
6.8.5 Access room for tape guides
6.8.6 Holes for accessing the hubs
. . .
111
---------------------- Page: 3 ----------------------
ISO/IEC 12248: 1993 (E)
11
Internal structure of the lower half
6.8.7
12
6.8.8 Light path
13
6.8.9 Support areas
13
6.8.10 Datum areas
13
6.8.11 Relationship between support and datum areas and Reference Plane Z
13
69 Hubs
14
6’10 Leader and trailer attachment
14
6’11 Interface between the hubs and the drive spindles
14
6’12 Opening of the lid
14
Release of the hub locking mechanism
6’13
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
72 . Tape length
26
7.2.1 Length of magnetic tape
26
Length of leader and trailer tapes
7.2.2
26
73 . Tape width
26
74 . Discontinuities -
26
Total thickness
75 .
26
76 . Longitudinal curvature
26
77 . Cupping
27
78 . Coating adhesion
27
79 Layer-to-layer adhesion
28
7’10 . Tensile Strength
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
Light transmittance of tape
7.13
29
8 Magnetit recording characteristics
30
81 . Optimum recording field
30
. Signal amplitude
82
30
83 . Resolution
30
Overwri te
84 .
30
002 ftpmm
recording densities of 750,6 and 3
8.4.1 Physical
31
1 001 ftpmm
densities of 83,4 ftpmm and
8.4.2 Physical recording
31
85 . Ease of erasure
31
. Tape quality
86
31
8.6.1 Missing pulses
31
Missing pulse zone
8.6.2
31
87 . Signal-to-noise ratio (S/N) characteristic
iv
---------------------- Page: 4 ----------------------
ISOIIEC 12248: 1993 (E)
32
Section 4 - Format
32
DATA/DAT-DC format
9
32
General
91 .
32
92 . Basic Groups
32
9.2.1 Basic Groups for Group Format 0
34
Basic Groups for Group Format 1
9.2.2
35
93 . Sub-groups
35
GI Sub-group
9.3.1
36
9.3.2 G2 Sub-group
36
G3 Sub-group
9.3.3
37
9.3.4 G4 Sub-group
42
Main Data Block
9.3.5
43
94 . Sub-Data area
44
9.4.1 Pack Item No. 1
45
Pack Item No. 2
9.4.2
47
9.4.3 Pack Item No. 3
48
Pack Item No. 4
9.4.4
48
9.4.5 Pack Item No. 5
49
9.4.6 Pack Item No. 6
50
Pack Item No. 7
9.4.7
50
9.4.8 Sub Data Block
52
Basic Group structure
95 l
52
9.51 User Data
53
System Data
9.5.2
57
9.5.3 Record ID list
62
Heuristic Recovery Data Area
9.5.4
62
10 Method of recording
62
Physical recording density
10.1
62
10.2 Long-Term average bit cell length
62
Short-Term average bit cell length
10.3
62
10.4 Rate of Change
62
10.5 Bit shift
62
Read Signal amplitude
10.6
62
10.7 Maximum recorded Levels
63
Track geometry
11
63
11.1 Track configuration
63
11.2 Average track pitch
63
11.3 Variations of the track pitch
64
Track width
11.4
64
11.5 Track angle
64
Track edge linearity
11.6
64
11.7 Track length
64
11.8 Ideal tape centreline
64
11.9 Azimuth angies
V
---------------------- Page: 5 ----------------------
ISO/IEC 12248: 1993 (E)
64
12 Recording of blocks on the tape
64
12.1 Recorded Main Data Block
64
12.2 Recorded Sub Data Block
65
Margin Blocks, Preamble Blocks and Postamble Blocks
12.3
65
12.4 Spacer Blocks
65
Format of a track
13
65
13.1 Track capacity
65
Positioning accuracy
13.2
65
13.3 Tracking scheme
68
14 Group Formats
68
14.1 Group Format 0
68
14.2 Group Format 1
69
Extended Gap Frames
14.3
69
14.3.1 Extended Leading Gap Frames
69
Extended Trailing Gap Frames
14.3.2
69
14.4 Types of Groups
70
14.4.1 Normal Groups
70
14.4.2 Spare Groups _
70
14.4.3 Amble Groups
70
Header Groups
14.4.4
71
15 Magnetit tape layout
71
15.1 Load/Unload Area
72
15.2 Lead-in Area
72
15.2.1 Preamble
72
152.2 Header
74
15.2.3 Format Parameter Set
79
15.2.4 Master Reference
84
15.25 Postamble
85
15.3 Parti tion
85
15.3.1 Partition Preamble
85
Partition Reference
153.2
96
15.3.3 Partition Postamble
96
15.3.4 Partition Data
96
15.3.5 End of Partition (EOP)
97
15.3.6 Unused Area
97
15.4 EO1
97
Repeated Groups
15.5
97
15.6 Repeated Frames within a Normal Group
98
Relocation of Defec tive Groups
15.7
98
15.8 Appending
98
15.8.1 Seamless appending
100
15.8.2 Non-seamless appending
101
15.9 Overwrite
vi
---------------------- Page: 6 ----------------------
ISO/IEC 12248: 1993 (E)
15.9.1 Overlapped track width 102
15.9.2 Non-overlapped track width
102
15.9.3 Rules for overwrite 102
Annexes
A - Measurement of the light transmittance of the prisms
103
B - Recognition holes
105
C - Means for opening the lid
106
D - Measurement of light transmittance of tape and leaders
107
E - Measurement of Signal-to-Noise Ratio 110
F - Method for determining the nominal and the maximum allowable recorded levels
111
G - Representation of g-bit bytes by 100bit Pattern
112
H - Measurement of bit shift
118
J - Recommendations for transportation
121
K - Method of measuring track edge linearity
122
L - Read-After-Write
123
M - Data allocation and C3 parity
124
vii
---------------------- Page: 7 ----------------------
ISO/IEC 12248: 1993 (E)
Foreword
ISO (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 ISO 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. ISO and IEC technical committees collaborate in fields of mutual inter-
est. Other international organizations, governmental and non-governmental, 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 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 12248 was prepared by the European Computer
Manufacturers Association (ECMA) (as Standard ECMA- 171) and was adopted,
under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC
JTC 1, Infomtation technology, in parallel with its approval by national bodies
of ISO and IEC.
Annexes A, D, E, F, G, H, K and M form an integral part of this International
Standard. Annexes B, C, J and L are for information only.
. . .
Vlll
---------------------- Page: 8 ----------------------
ISO/IEC 12248: 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: 1991, 3,81 mm wide magnetic tape cartridge foR information interchange - Helical scan recording -
DDS format
ISO/IEC 113 19: 1993,8 mm wide magnetic tape cartridge for information interchange - Helical scan recording
ISOfIEC 11321: 1992, 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan Recording -
DATAIDAT format
ISOfIEC 11557:1992, 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording -
DDS-DC format using 60 m and 90 m length tapes, 2nd edition
ISOfIEC 12246: 1993, 8 mm wide magnetic tape cartridge, dual azimuth format for information interchange - Helical
scan recording
ISO/IEC 12247: 1993, 3,81 mm wide magnetic tape cartridge for information interchange - Helical scan recording -
DDS format using 60 m and 90 m length tapes
ix
---------------------- Page: 9 ----------------------
This page intentionally left blank
---------------------- Page: 10 ----------------------
ISO/IEC 12248:1993 (E)
INTERNATIONAL STANDARD
Information technology - 3,81 mm wide magnetic tape cartridge for information
interchange - Helical scan recording - DATA/DAT-DC 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 DATA/DAT-DC.
This International Standard specifies two types of cartridges which, for the purpose of this International Standard, are
referred to as Type A and Type B.
For Type A, the magnetic tape has a nominal thickness of 13 um and a nominal length of up to 60,5 m.
For Type B, the magnetic tape has a nominal thickness of 9 um a 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 file 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 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 for either Type A or Type B. The tape requirements shall be satisfied throughout the extent of the
tape.
22 .
Generating System
A System generating a magnetic tape cartridge for interchange shall be entitled to Claim conformance to this
International Standard if all recordings on the tape meet the mandatory requirements of this International Standard. A
Claim of conformance shall state whether cartridges of Type A or Type B or both are supported.
23 . Receiving System
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.
A Claim of conformance shall state whether cartridges of Type A or Type B or both are supported.
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 arc 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 IEC and ISO maintain registers of
currently valid International Standards.
ISO/R 527: 1966, Plastics - Determination of tensile pr0pertie.s
ISO/IEC 646: 1991, Information technology - ISO 7-bit coded Character set for information interchange.
ISO 1302: 1992, Technical drawings - Method of indicating surface texture.
1
---------------------- Page: 11 ----------------------
ISOIIEC 12248: 1993 (E)
ISO/IEC 11576: 1993, Information technology - Procedure for the registration of algorithms for the lossless
compression of data.
IEC 950: 1991, Safety of information technology equipment, including electrical business equipment
4 Definitions
For the purposes of this International Standard, the following definitions apply.
41 . Absolute Frame Number (AFN): A sequence number allocated to, and recorded in, each frame.
4.2 algorithm: A set of rules for transforming the logical representation of data.
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.
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.
48 . byte: An ordered set of bits acted upon as a unit.
49 . cartridge: A case containing magnetic tape stored on twin hubs.
4.10 Channel Bit: A bit after 8-to-10 transformation.
4.11 Codeword: A word which is generated by a processing algorithm. The number of bits in a Codeword is
variable, and is not specified in this International Standard.
4.12 Data Format ID: An identifier specifying which data format is being used on the tape.
4.13 End of Data (EOD): The Point where the host stopped writing data on the tape.
4.14 End of Information (EOI): A group which indicates the end of partition area in a tape.
End of Partition (EOP): A group which indicates the end of data area in a partition.
4.15
4.16 entity: A unit of recorded data, comprising a processed record sequence resulting from the application of a
common processing algorithm.
4.17 Error Correcting Code (ECC): A mathematical algorithm yielding check bytes used for the detection and
correction of errors.
4.18 flux transition Position: That Point which exhibits maximum free-space flux density normal to the tape
surface.
4.19 flux transition spacing: The distance along a track between successive flux transitions.
4.20 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.
4.21 group: A number of frames constituting a recorded unit.
4.22 Logical Beginning of Tape (LBOT): The Point along the length of the tape where the recording of data for
interchange commences.
4.23 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.
2
---------------------- Page: 12 ----------------------
ISO/IEC 12248: 1993 (E)
4.24 magnetic tape: A tape which will accept and retain magnetic Signals intended for input, output, and storage
purposes on Computers and associated equipment.
4.25 master reference: The area which contains partition information in the tape.
4.26 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 pm wide, at nominal track pitch, on an AC-erased tape.
NOTE 1 - The tape includes recordings made at 83.4 ftpmm, 333.6 ftpmm, 500.4 ftpmm, 1001 ftpmm and 1501 ftpmm.
NOTE 2 - The Master Standard Amplitude Calibration Tape has been established by the Sony Corporation.
4.27 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 Reference Tape has been established by the Sony Corporation.
4.28 Optimum Recording Fieid: In the plot of Average Signal Amplitude against the recording field at the physical
recording density of 3002 ftpmm, the field that Causes the maximum Average Signal Amplitude.
4.29 partition: Partition of a tape in which user data is recorded.
4.30 partition reference: The area which contains group information in the partition.
4.31 Physical Beginning of Tape (PBOT): The Point where the leader tape is joined to the magnetic tape.
4.32 Physical End of Tape (PEOT): The Point where the trailer tape is joined to the magnetic tape.
4.33 physical recording density: The number of flux transitions per unit length of track, expressed in flux
transitions per millimetre (ftpmm).
4.34 pre-recording condition (maximum recorded levels): The recording levels above which a tape intended for
interchange shall not previously have been recorded.
4.35 processed record: A sequence of Codewords which result from the application of processing to data.
processed records which Start on an 8-bit boundary
4.36 processed record sequence: A sequence of one or more
and end on a subsequent 8-bit boundary.
4.37 processing: The use of an algorithm to transform host data into Codewords.
record: Related data treated as a unit of information.
4.38
4.39 Reference Recording Field: The Optimum recording field of the Master Standard Reference Tape.
4.40 Secondary Standard Amplitude Calibration Tape: A tape pre-recorded as defined for the Master Standard
Amplitude Calibration Tape; the Outputs of which are known and stated in relation to that of the Master Standard
Amplitude Calibration Tape.
NOTE 4 - The Secondary Standard Amplitude Calibration Tape tan be ordered from the Sony Corporation, Audio Device Business Department,
Component Marketing Group 4-10-18, Takanawa, Minato-ku, Tokyo 108, Japan, under Part Number TY-7000 G until the year 2000. It is intended
that these be used for calibrating tertiary tapes for use in routine calibration.
4.41 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 5 - A Secondary Standard Reference Tape tan be ordered from the Sony Corporation, Audio Device Business Department, Component
Marketing Group 4-10-18. Takanawa, Minato-ku, Tokyo 108, Japan, under Part Number RSD 1079 until the year 2000. It is intended that these be
used for calibrating tertiary tapes for use in routine calibration.
4.42
Separator Mark: A record containing no user data, which is used to separate data.
3
---------------------- Page: 13 ----------------------
ISO/IEC 12248: 1993 (E)
4.43 Standard Reference Amplitude: The Average Signal Amp1 itude from the tracks of positive azimuth of the
recording density.
Master Standard Amplitude Calibration Tape at a specified physical
noise from total noise in
4.44 tape noise amplitude: The tape noise amplitude is the subtractive value of amplifier
Ims.
4.45 Tape Reference Edge: The bottom edge of the tape when viewing the recording side of the tape with the
PEOT of the tape to the observer’s right.
4.46 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 below refer to ambient conditions in the air immediately
surrounding the cartridge.
51 . 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 OC zt 2 OC
temperature
relative humidity : 40 % to 60 %
conditioning period before testing : 24h
Operating environtient
52 .
Cartridges used for data interchange shall be capable of operating under the following conditions:
: 5 OC to 45 OC
temperature
relative humidity : 20 % to 80 %
wet bulb temperature : 26 OC 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 6 - Rapid variations of temperatwe simuld be avoided”.
53 . Storage environment
For long term or archived storage of cartridges the following conditions shall be observed:
temperature : 5 OC to 32 OC
relative humidity :I 20 % to 66 %
maximum wet bulb temperature
:’ 26 OC max.
The stray magnetic field at any Point on the tape shall not exceed 4 000 A/m. There shall be no deposi t of moisture
on or in the cartridge.
54 .
Transportation
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 darnage, are provided in annex J.
---------------------- Page: 14 ----------------------
ISOIIEC 12248: 1993 (E)
55 . Safety
The cartridge and its components shall satisfy the requirements sf IEC 950.
56 l Flammability
The cartridge and its components shall be made from material which, if ignited from a match flame, do not continue
to burn in a still carbon dioxide atmosphere.
- Requirements for the case
Section 2
Dimensional and mechanical characteristics of the case
6
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 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 left side.
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.
is a side view of a hub with partial Cross section.
Figure 16
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 2 (figure 4).
62 . 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
4
= 54,O mm * 0,3 mm
L2
= 10,5 mm * 0,2 mm
L3
---------------------- Page: 15 ----------------------
ISO/IEC 12248: 1993 (E)
The edges formed by the rear side and left and right sides shall be rounded off with a radius
= 1,5 mm max.
Rl
The two edges of the lid shall be rounded off with a radius
= 0,5 mm max.
R2
63 . Loading grip (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
L = 25,5 mm & 0,3 mm
4
= 10 mm min.
L5
= 5,0 mm * 0,2 mm
L6
L, = 2,0 mm min.
The depth of the loading grip below surface of the top side shall be
+W
0,5 mm mm
- 0.0
64 . Holding areas (figure 6)
The two areas shown shaded in figure 6 shall be the areas along which the cartridge shali be held down when inserted
in the drive. Their positions and dimensions shall be
= 6,0 mm =f: 0,l mm
L8
= 5,0 mm * 0,l mm
L9
65 . Notches of the lid (f’igures 5 and 8)
The lid shall have two pairs of notches.
The first pair of notches, the slider leck 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.
10
= 3,0 mm min.
bl
= 1,2 mm * 0,l mm
b2
= 49,8 mm & 0,2 mm
b3
The second pair of notches, the slider movement notches, allows elements of the drive to move the slider from closed
to open Position (see also 6.8.1). The positions and dimensions of these notches shall be
L = 3,0 mm min.
11
= 0,9 mm min.
b4
= 7,5 mm * 0,l mm
L15
= 36,00 mm * 0,15 mm
L16
66 . Lid dimensions (figures 6 to 8)
The lid is shown in closed Position in figures 6 and 7. Its dimensions shall be
6
---------------------- Page: 16 ----------------------
ISO/IEC 12248: 1993 (E)
L = 1,2 mm * 0,l mm
17
= 6,8 mm * 0,4 mm
L18
L = 1,l mm * 0,l mm
19
= 2,0 mm * 0,l mm
L20
= 6,4 mm k 0,2 mm
L21
= 1,5 mm * 0,l mm
L22
= 6,8 mm * 0,4 mm
R3
The lid shall have a chamfer of 45O with a length of
1,5 mm * 0,l mm
L23 =
There shall be a dimensional relationship between the height L24 shown in figure 7, which includes the slider and the
upper half, and the height L,, of the lid. When a vertical forte of 1 N is exerted on the upper half the following
conditions shall be met
= 10,5 mm * 0,2 mm
L24
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 * 0,3 mm
L26
67 . Optical detection of the beginning and end of tape (figures 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 light 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 case.
The positions and dimensions of these windows allow the cartridge to be used with drives implementing either
System, they shall be
= 6,20 mm * 0,lO mm
L27
= 7,65 mm k 0,lO mm
L28
+ 0,20
= 1,50mm mm
L29
- 0,oo
= 3,9 mm * 0,l mm
L30
= 1,8 mm i 0,l mm
L31
= 7,0 mm i 0,2 mm
L32
---------------------- Page: 17 ----------------------
ISO/IEC 12248: 1993 (E)
= 2,5 mm min.
L33
Dimension L32 specifies the Position of the rear edge of the windows relative to Reference Plane Y. Dimension L,,
shall be measured relative to this rear edge.
68 . Bottom side (figures 10 and 11)
The bottom side is shown in figure 10 with the lid and the slider in closed Position and in figure 11 with both in the
open Position.
The dimension L,, o
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.