ISO/IEC 14840:1996
(Main)Information technology — 12,65 mm wide magnetic tape cartridge for information interchange — Helical scan recording — Data-D3-1 format
Information technology — 12,65 mm wide magnetic tape cartridge for information interchange — Helical scan recording — Data-D3-1 format
Describes the physical and magnetic characteristics of a magnetic tape cartridge, using magnetic tape 12,65 mm wide, so as to provide physical interchangeability of such cartridges. Specifies the quality of the recorded signals, the recording method and the recorded format.
Technologies de l'information — Cartouche de bande magnétique de 12,65 mm de large pour l'échange d'information — Enregistrement par balayage en spirale — Format de données-D3-1
General Information
Standards Content (Sample)
ISO/IEC
INTERNATIONAL
14840
STANDARD
First edition
1996-08-01
Information technology - 12,65 mm wide
magnetic tape cartridge for information
interchange - Helical scan recording -
Data-D34 format
- Cartouche de bande magn&ique de
Technologies de /‘information
12,65 mm de large pour &change d’information - Enregistrement par
balayage en spirale - Format de don&es-D3- 1
Reference number
lSO/lEC 14840:1996(E)
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ISO/IEC 14840:1996 (E)
Page
Contents
1
Section 1 - General
1
1 Scope
1
2 Conformance
1
2.1 Magnetic tape cartridge
1
2.2 Generating system
1
2.3 Receiving system
1
3 Normative References
2
4 Definitions
2
4.1 a.c. erase
2
4.2 algorithm
2
4.3 Average Signal Amplitude
2
4.4 azimuth
2
4.5 back surface
2
4.6 Beginning of Tape (BOT)
2
4.7 Beginning of Tape Sense Slot
2
4.8 byte
2
4.9 cartridge
2
4.10 character
2
4.11 Codeword Digital Sum (CDS)
2
4.12 Cyclic Redundancy Check (CRC) Character
2
4.13 Data Area Reference Point
2
4.14 Data Records
2
4.14.1 Logical Data Record (LDR)
2
4.14.2 Processed Data Record (PDR)
2
4.14.3 User Data Record (UDR)
4.15 Digital Sum Variation (DSV)
4.16 End of Tape (EOT)
4.17 End of Tape Sense Slot
4.18 Error Correcting Code (ECC)
4.19 File safe
4120 Fixed Scan Group Header
0 ISO/IEC 1996
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized
in any form or by any means, electronic or mechanical, including photocopying and microfilm,
without permission in writing from the publisher.
ISO/IEC Copyright Office * Case Postale 56 * CH-1211 Geneve 20 * Switzerland
Printed in Switzerland
ii
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* ISO/IEC 14840:1996 (E)
0 ISOIIEC
3
4.21 flux transition position
3
4.22 flux transition spacing
3
4.23 Helical Time Code (HTC)
3
4.24 Internal Leader Header (ILH)
3
4.25 Logical Block Number
3
4.26 magnetic tape
3
4.27 Master Standard Reference Tape
3
4.28 Packet
3
4.29 Packet identifier
3
4.30 Packet Trailer
3
4.31 physical recording density
3
4.32 Postamble
3
4.33 Preamble
3
4.34 processed data
3
4.35 Reference Fields
3
4.36 resolution
3
4.37 Scan Group
3
4.38 Scan Group Pair
3
4.39 Scan Group Start Data (SGSD)
3
4.40 Secondary Standard Reference Tape
3
4.41 Standard Reference Amplitudes (SRA)
4
4.42 Standard Reference Currents (Ir)
4
4.43 Tape Reference Edge
4
4.44 Test Recording Currents (TRC)
4
4.45 track
4
4.46 track angle
4
4.47 Typical Field (TF)
4
4.48 Variable Scan Group Header
4
4.49 zero crossing
4
5 Conventions and Notations
4
5.1 Representation of numbers
5
5.2 Names
5
6 Acronyms
7 Environment and Safety
7.1 Testing environment
7.2 Operating environment
7.3 Storage environment
7.4 Transportation
7.5 Safety
7.6 Flammability
Section 2 - Requirements for the Cartridge
8 Dimensional and Mechanical Characteristics of the Cartridge
8.1 Elements of the cartridge
8.2 Reference Planes of the case
8.3 Dimensions of the case
83.1 Overall dimensions
8.3.2 Locating areas
8.3.3 Reference points for Plane Y
8.3.4 Reference point for Plane Z
8.3.5 Locating notches
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0 ISOIIEC
ISO/IEC 14840: 1996 (E)
9
8.3.6 Mis-insertion protection
9
8.3.7 Stacking ribs
9
8.3.8 Recognition notches
10
8.3.9 Write-inhibit mechanism
10
8.3.10 Label areas of the top side
11
8.3.11 Label areas of the rear side
11
8.3.12 Label area on the right hand side
12
8.3.13 Label area on the bottom side
12
8.3.14 Central window
12
8.3.15 Case opening
13
8.3.16 Tapers of the case
13
8.4 Flexibility of the case
13
8.4.1 Requirements
13
8.4.2 Procedure
14
8.5 Tape reel
14
Locking mechanism
8.5.1
14
Axis of rotation of the reel
8.5.2
14
Metallic insert
8.5.3
14
8.5.4 Toothed rim
15
8.5.5 Hub of the reel
15
8.5.6 Relative positions of hub and case
16
8.5.7 Characteristics of the toothed rim
16
8.6 Magnetic tape
16
8.6.1 Tape wind
16
8.6.2 Wind tension
16
8.6.3 Circumference of the tape reel
16
8.6.4 Moment of inertia
17
8.7 Leader block
17
8.7.1 Dimensions of the leader block
17
8.7.2 Attachment of the tape to the leader block
17
8.7.3 Latching the leader block
18
8.8 Reflection density of the case
18
8.8.1 Requirement
19
8.8.2 Test Equipment
18
8.8.3 Test method
19
8.9 Colour
27
Section 3 - Requirements for the Unrecorded Tape
27
9 Mechanical, physical and dimensional characteristics of the tape
27
9.1 Materials
27
9.2 Tape length
27
9.3 Tape width
27
9.4 BOT and EOT Sense Slots
27
9.5 Discontinuities
27
9.6 Thickness
27
9.7 Longitudinal curvature
28
9.8 Straightness
28
9.9 Cupping
28
9.10 Out-of-plane distortions
28
9.11 Coating adhesion
29
9.12 Layer-to-layer adhesion
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* ISO/IEC 1484031996 (E)
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29
9.13 Young’s Modulus for the tape
29
9.14 Surface roughness
30
9.15 Electrical resistance of coated surfaces
30
9.16 Tensile strength
30
9.16.1 Breaking strength
30
9.16.2 Offset yield strength
31
9.17 Residual elongation
31
9.18 Light transmittance of the tape
31
10 Magnetic Recording Characteristics
31
10.1 General
31
10.2 Basis for measuring the magnetic recording characteristics of the unrecorded tape.
31
10.3 Test conditions
32
10.4 Typical Field
32
10.5 Signal Amplitude
32
10.6 Resolution
32
10.7 Ease of Erasure
32
10.8 Narrow-band Signal-to-Noise Ratio (NB-SNR)
33
10.9 Tape Quality
33
10.9.1 Missing pulses
33
10.9.2 Missing pulse zones
34
Section 4 - Requirements for an Interchanged Tape
34
11 Format of a helically recorded track
34
11.1 General description of the write data path
34
11.1.1 Formation of Packets
34
11.1.2 Formation of Scan Groups
34
11.1.3 Channel separation
34
11.1.4 Interleave buffer
34
11.1.5 Sync Blocks
34
11.1.6 Randomization
34
11.1.7 Logical helical track
34
11.1.8 Byte translation
34
11.1.9 Recording of tracks
36
11.2 Packet format
36
11.2.1 Packet definition
36
11.2.2 Packet ID
37
11.2.3 UDR
37
11.2.4 Packet Trailer
38
11.3 Scan Group
39
11.3.1 Scan Group Start Data (SGSD)
39
11.3.2 Helical Time Code (HTC)
40
11.3.3 Header
44
11.3.4 Data Part
44
11.3.5 Trailer
44
11.3.6 Types of Scan Group
47
11.3.7 Protection of Scan Groups
48
11.4 Write data channel
48
11.4.1 Scan Group sections
49
11.4.2 Interleave Buffer
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ISO/IEC 14840: 1996 (E)
52
11.4.3 Sync Blocks
53
11.4.4 Layout of a logical helical track
54
11.4.5 Byte translation
55
12 Track geometry
55
12.1 General
56
12.2 Helically recorded tracks
56
12.2.1 Track width
56
12.2.2 Adjacent track pitch
56
12.2.3 Track angle
56
12.2.4 Straightness of a track
56
12.2.5 Track length
56
12.2.6 Azimuth angles
56
12.2.7 Location of positive azimuth tracks
56
12.2.8 Location of Data Area Reference Point
57
12.3 Time Code Track
57
12.3.1 Track location
57
12.3.2 Azimuth
57
12.4 Servo Control Track
57
12.4.1 Track location
57
12.4.2 Azimuth
57
12.5 Reserved Longitudinal Track
59
13 Method of recording helical tracks
59
13.1 Tape condition before recording
59
13.2 Method of recording
59
13.3 Physical Recording Densities
60
13.4 Nominal Bit Cell Length
60
13.5 Long-term Average Bit Cell Length
60
13.6 Short-term Average Bit Cell Length (STA)
60
13.7 Rate of Change of the STA
60
13.8 Bit shift
60
13.9 Read signal amplitude
60
14 Servo Control Track
60
14.1 Format
60
14.2 Relative locations of Pulse Pairs and Scan Group Pairs
60
14.3 Polarity of magnetisation
60
14.4 Read signal amplitude
61
14.5 Quality of the Servo Control Track
61
15 Time Code Track
61
15.1 Format
61
15.1.1 Count bits
61
15.1.2 Supplementary Data
61
15.1.3 Phase bit
61
15.1.4 Synchronizing pattern
61
15.2 Extent of a Time Code
61
15.3 Relative locations of the Time Code and Scan Group Pairs
61
15.4 Form of recording
62
15.4.1 Nominal bit density
62
15.4.2 Nominal bit cell length
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ISO/IEC 14840:1996 (E)
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62
15.4.3 Bit shift
62
15.5 Read signal amplitude
62
15.6 Quality of the Time Code Track
63
16 Tape format
63
16.1 Layout of the magnetic tape
64
16.2 Data Area
64
16.2.1 Capacity of tape sectors
64
16.2.2 Sequence of Scan Groups on the tape
66
16.2.3 Write skips
66
16.2.4 Appended Data
66
16.3 EOD
Annexes
67
A - Representation of the CRC used in 11.2 - Packet Format
68
B- Representation of the CRC used in 11.3 - Scan Group
69
C - Representation of S-bit bytes by 14-bit patterns
81
D- Generation of Outer ECC and Inner ECC
83
E- Measurement of the geometry of helical tracks
86
F - Measurement of Bit Shift
90
G - Label - Media type
96
H - Reflection density of the case
97
J - Measurement of light transmittance of tape
100
K - Recommendations for transportation
101
L- Guidelines for handling tape cartridges
102
M - Helical and Longitudinal Time Codes
104
N - Representation of the CRC used in 11.3.2 - HTC
105
P - Bibliography
vii
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ISO/IEC 14840: 1996(E)
0 ISOIIEC
Foreword
IS0 (the International Organization for Standardization) and IEC (the
International Electrotechnical Commission) form the specialized system for
worldwide standardization. National bodies that are members of IS0 or IEC par-
ticipate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields
of technical activity. IS0 and IEC technical committees collaborate in fields of
mutual interest. 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. Publication
as an International Standard requires approval by at least 75 % of the national
bodies casting a vote.
International Standard ISO/IEC 14840 was prepared by ECMA (as Standard
ECMA-210) 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 to D, F, G, J, M and N form an integral part of this International
Standard. Annexes E, H, K, L and P are for information only.
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ISOIEC 14840:1996 (E)
INTERNATIONAL STANDARD OISO/IEC
Information technology - 12,65 mm wide magnetic tape cartridge for information
interchange - Helical scan recording - Data-D3-1 format
Section 1 - General
1 Scope
This International Standard specifies the physical and magnetic characteristics of a magnetic tape cartridge, using magnetic
tape 12,65 mm wide, so as to provide physical interchangeability of such cartridges. It also specifies the quality of the
recorded signals, the recording method and the recorded format, thereby allowing data interchange between drives by means
of such magnetic tape cartridges.
This International Standard specifies three types of cartridge which, for the purposes of this International Standard, are
referred to as Type A, Type B and Type C.
For Type A, the magnetic tape has a nominal length of 9 1 m and a nominal capacity of 10 GBytes.
For Type B, the magnetic tape has a nominal length of 204 m and a nominal capacity of 25 GBytes.
For Type C, the magnetic tape has a nominal length of 392 m and a nominal capacity of 50 GBytes.
Together with a Standard for Volume and File Structure this International Standard provides for full data interchange
between data processing systems.
2 Conformance
2.1 Magnetic tape cartridge
A claim of conformance with this International Standard shall specify the Type of the cartridge. It shall be in conformance
with this International Standard if
l the cartridge meets all the requirements of clause 4 and clauses 7 to 10
l the recording on the tape meets the requirements of clauses 11 to 16
l for each recorded Packet the algorithm used for processing the data therein, if the recorded data has been processed, has
been registered and the registered identification is included in Byte 13 of the Packet ID of this Packet (see 11.2.2)
22 . Generating system
A system generating a magnetic tape cartridge for interchange shall be entitled to claim conformance with this International
Standard if all the recordings that it makes, on all three Types of cartridge, meet the mandatory requirements of this
International Standard. A claim of conformance shall state whether or not one, or more, registered algorithm(s) is (are)
implemented and, if so, the registered number(s) of (all) the implemented algorithm(s).
Receiving system
23 .
A system receiving a magnetic tape cartridge for interchange shall be entitled to claim conformance with this Standard if it
is able to handle any recording made on the tape according to this International Standard, and for all three Types.
A claim of conformance shall state whether or not one, or more, registered algorithm(s) is (are) implemented and, if so, the
registered number(s) of (all) the implemented algorithm(s).
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 indicated below. Members of IEC and IS0 maintain registers of currently valid International
Standards.
ISO/R 527: 1966 Plastics - Determination of tensile properties.
---------------------- Page: 9 ----------------------
0 ISO/IEC
ISO/IEC 14840:1996 (E)
tapes for information
Information processing - File structure and label@ of magnetic
IS0 1001:1986
interchange.
Technical drawings - Method of indicating surface texture.
IS0 1302:1992
Heat-treatable steels, alloy steels and free-cutting steels - Part 13: Wrought stainless steels.
IS0 683-13:1986
Information technology - Procedure for the registration of algorithms for the lossless
ISO/IEC 11576:1994
compression of data.
Safety of information technology equipment, including electrical business equipment.
IEC 950: 1995
4 Definitions
For the purposes of this International Standard, the following definitions apply.
a.c. erase: A process of erasure utilizing alternating magnetic fields of decaying intensity.
41 .
algorithm: A set of rules for transforming the logical representation of data.
42 .
Average Signal Amplitude: The average peak-to-peak value of the signal output of a read head measured over a
43 .
minimum of 3 000 flux transitions, exclusive of missing pulses.
azimuth: The angular deviation, in degrees of arc, of the recorded flux transitions on a track from the line normal
44 .
to the track centreline.
45 . back surface: The surface of the tape opposite to the magnetic coating used to record data.
46 . Beginning of Tape (BOT): The point along the tape indicated by the start of the density identification burst.
47 . Beginning of Tape Sense Slot: A slot on the centreline of the tape indicating the beginning of usable tape.
48 . byte: An ordered set of 8 bits acted upon as a unit.
49 . cartridge: A case containing a single reel of magnetic tape with a leader attached at the BOT end.
4.10 character: A unit of information represented by one or more bytes.
4.11 Codeword Digital Sum (CDS): The value of the Digital Sum Variation (DSV) taken over a single 14-bit pattern.
4.12 Cyclic Redundancy Check (CRC) Character: Two bytes derived from information contained in the data bytes,
pad bytes and other bytes.
4.13 Data Area Reference Point: The physical position of the start of the first Outer ECC Sync Block of a positive
azimuth helical track.
4.14 Data Records
4.14.1 Logical Data Record (LDR): The data entity received by the generating system from the host. It may consist
of one, or several, Host Data Record(s) depending upon the action taken by the host to use extended blocks.
4.14.2 Processed Data Record (PDR): The data entity resulting from the application of an algorithm to an LDR.
4.14.3 User Data Record (UDR): The data entity available to the Packet generator. When the data has been
processed it is a PDR. When the data has not been processed it is an LDR.
4.15 Digital Sum Variation (DSV)
The integrated value of Channel Bits, taken from the point at which byte translation commences, i.e. at the start of each
helical track, and counting a ONE as +l and a ZERO as - 1.
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ISOAEC 14840: 1996 (E)
0 ISO/IEC
4.16 End of Tape (EOT): The point towards the hub end of the tape beyond which no recording shall be made.
End of Tape Sense Slot: A slot on the centreline of the tape indicating the end of usable tape.
4.17
4.18 Error Correcting Code (ECC): A mathematical procedure yielding bits used for the detection and correction of
errors.
, but which
File safe: The designation for a tape that allows data to be appended to data that has already been written
4.19
prevents such previously written data from being overwritten.
4.20 Fixed Scan Group Header: A header which is not changed when the Scan Group is rewritten.
flux transition position: That point along a track that exhibits the maximum free-space flux density normal to the
4.21
tape surface.
4.22 flux transition spacing: The distance along a track between successive flux transitions.
Helical Time Code (HTC): A time code added to a Scan Group, recorded in the helical tracks and used to ensure
4.23
that a particular Scan Group Pair can be located if the longitudinal Time Code has been lost.
4.24 Internal Leader Header (ILH): A pair of Scan Groups containing volume information.
A count of the number of blocks of data transferred from the host to the tape system and
4.25 Logical Block Number:
by the host.
the number of Tape Marks requested
4.26 magnetic tape: A tape which will accept and retain the magnetic signals intended for input, output and storage
purposes on computers and associated equipment.
4.27 Master Standard Reference Tape: A tape selected as the standard for Reference Field, Signal Amplitude and
Resolution.
Note 1 - The Master Standard Reference Tape has been established at Pericomp Corporation.
Packet: A UDR with a Packet Identifier and a Packet Trailer added.
4.28
4.29 Packet Identifier: The group of 32 bytes added to the beginning of a UDR when forming a Packet.
4.30 Packet Trailer: The group of bytes of variable size appended to a UDR when forming a Packet.
physical recording density: The number of recorded flux transitions per unit length of track, specified as flux
4.31
transitions per millimetre (ftpmm) .
4.32 Postamble: A sequence of &bit bytes at the end of a logical helical track.
Preamble: A sequence of g-bit bytes at the beginning of a logical helical track.
4.33
4.34 processed data: Data which has been processed by an algorithm.
4.35 Reference Fields: The Typical Field of the Master Standard Reference Tape. There are three Reference Fields,
RFl, RF2 and RF3.
4.36 resolution: The ratio of the average signal amplitude at a high physical recording density to that at a lower physical
recording density.
4.37 Scan Group: A set of 6 contiguously recorded helical tracks.
4.38 Scan Group Pair: Two contiguous Scan Groups, the first of which is even-numbered and the second is odd-
numbered.
4.39 Scan Group Start Data (SGSD): A series of bytes defining the start of a Scan Group.
4.40 Secondary Standard Reference Tape: A tape the performance of which is known and stated in relation to that of
the Master Standard Reference Tape.
Secondary Standard Reference Tapes can be ordered under Part Number #SMRT/Rdwd-PC95, until the year 2006, from
Pericomp Corporation, 14 Huron Drive, Natick, MA 01760, USA.
Telephone: +l-508 655 7660
Facsimile: +l-508 653 9288
It is intended that reference tapes for use in calibration.
these be used for calibrating tertiary routine
4.41
Standard Reference Amplitudes (SRA): The Average Signal Amplitude derived from the Master Standard
Reference Tape when using the appropriate Test Recording Current and the appropriate recording density.
There are three SRAs:
SRAl is derived from a helically recorded track, recorded at 2 597 ftpmm with TRCl.
3
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ISO/IEC 14840: 1996 (E) 0 ISOIIEC
SRA2 is derived from the Servo Control Track, recorded at 2,146 ftpmm with TRC2.
SRA3 is derived from the Time Code Track, recorded at 57,2 ftpmm with TRC3.
Traceability to the SRAs is provided by the calibration factors supplied with each Secondary Standard Reference Tape.
4.42 Standard Reference Currents (Ir): The current that produces the Reference Field.
There are three Standard Reference Currents:
Irl is the current producing RF1 on a helically recorded track.
Ir2 is the current producing RF2 on the Servo Control Track.
Ir3 is the current producing RF3 on the Time Code Track.
4.43 Tape Reference Edge: The lower edge of the tape when viewing the recording surface of the tape with the supply
reel to the observer’s right.
4.44 Test Recording Currents (Technical Report): The recording current used to record an SRA.
There are three Test Recording Currents:
TRCl is 1,7 times Irl
TRC2 is 2,3 times Ir2
TRC3 is 2,3 times Ir3
4.45 track: A narrow, defined area on the tape along which a series of magnetic transitions may be recorded. A track
may be parallel to the Tape Reference Edge or positioned at an angle to it.
4.46 track angle: The angle between the centreline of a helically recorded track and the Tape Reference Edge.
4.47 Typical Field (TF): In the plot of Average Signal Amplitude against the Recording Field at a specified physical
recording density, the minimum field that causes an Average Signal Amplitude equal to a specified percentage of the maximum
Average Signal Amplitude.
There are three TFs:
TFl is the field giving an Average Signal Amplitude equal to 90% of the maximum Average Signal Amplitude at the Physical
Recording Density of 2 597 ftpmm on a helically recorded track.
TF2 is the field giving an Average Signal Amplitude equal to 90% of the maximum Average Signal Amplitude at the Physical
Recording Density of 2,146 ftpmm on the Servo Control Track.
TF3 is the field giving an Average Signal Amplitude equal to 90% of the maximum Average Signal Amplitude at the Physical
Recording Density of 57,2 ftpmm on the Time Control Track.
4.48 Variable Scan Header: A header which changes when
the Scan Group is rewritten.
4.49 zero crossing: A point at which the amplitude of the read signal passes through zero.
5 Conventions and Notations
Representation of numbers
5.1
l A measured value is rounded off to the least significant digit of the corresponding specified value. It implies that a specified
value of 1,26 with a positive tolerance of +O,Ol, and a negative tolerance of -0,02 allows a range of measured values from
1,235 to 1,275.
l Letters and digits in parentheses represent numbers in hexadecimal notation.
l The setting of a bit is denoted by ZERO or ONE.
0
Numbers in binary notation and bit combinations are represented by strings of ZEROS and ONES.
l Numbers in binary notation and bit combinations are shown with the most significant byte to the left, and with the most
significant bit in each byte to the left.
0
Negative values of numbers in binary notation are given in TWO’s complement.
In each field the data is processed so that the most significant byte (byte 0) is processed first. Within each byte the least
significant bit is numbered 0 and is processed last, the most significant bit (numbered 7 in an 8-bit byte) is processed first.
4
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ISO/IEC 14840: 1996 (E)
0 ISOAEC
Error Detection and Correction circuits and to their output,
This order of processing applies also to the data input to the
unles s otherwise stated.
5.2 Names
The names of entities, e.g. specific tracks, fields, etc., are given with a capital initial.
6 Acronyms
ASA Average Signal Amplitude
BOT Beginning of Tape
CDS Codeword Digital Sum
CRC Cyclic Redundancy Check
Density Identification
DID
Digital Sum Variation
DSV
Error Correcting Code
ECC
End of Tape
EOT
HTC Helical Time Code
ILH Internal Leader Header
LDR Logical Data Record
PDR Processed Data Record
Physical End Of Tape
PEOT
SGSD Scan Group Start Data
SEP Separator
SRA Standard Reference Amplitude
TF Typical Field
Test Recording Current
TRC
User Data Record
UDR
7 Environment and Safety
The conditions specified below refer to the ambient conditions immediately surrounding the cartridge.
Cartridges exposed to environments outside these limits may still be able to function usefully; however, such exposure may
cause permanent damage.
Testing environment
7.1
Unless otherwise specified, tests and measurements made on the cartridge to check the requirements of this International
Standard shall be carried out under the following conditions
temperature : 23°C + 2°C
relative humidity : 40 % to 60 %
conditioning
before testing : 24h
7.2 Operating environment
Cartridges used for data interchange shall be capable of operating under the following conditions
: 16°C to 32°C
temperature
: 20 % to 80 %
relative humidity
wet bulb temperature : 25°C max.
The average temperature of the air immediately surrounding the tape shall not exceed 45°C.
Conditioning before operating: If a cartridge has been exposed during storage and/or tmmportatim to conditions outside the
above values, it shall be conditioned for a period of at least 24 h.
7.3 Storage environment
For long-term or archival storage the following conditions shall be observed
temperature : 5°C to 32°C
relative humidity : 40 % to 60 %
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0 ISO/IEC
ISO/IEC 14840: 1996 (E)
stray magnetic field : shall not exceed 4 000 A/m at any point on the tape
There shall be no deposit of moisture on or in the cartridge.
7.4 Transportation
Recommended limits for the environments 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 K.
Safety
7.5
The cartridge shall satisfy the safety requirements of ECMA-129 when used in the intended manner or in any foreseeable use in
an information processing system.
Flammability
7.6
The cartridge shall be made from materials that comply with the flammability class for HB materials, or better, as specified in
ECMA-129.
6
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0 ISOLIEC
ISO/IEC 14840t1996 (E)
Section 2 - Requirements for the Cartridge
Dimensional and Mechanical Characteristics of the Cartridge
8
8.1 Elements of the cartridge
The cartridge shall consist of the following elements:
a case
recognition notches
a write inhibit mechanism
a reel for magnetic tape
a locking mechanism for the reel
a magnetic tape wound on the hub of the reel
a leader block
a latching mechanism for the leader block
Dimensional characteristics are specified for those parameters deemed to be mandatory for interchange and compatible use of
the cartridge. Where there is freedom of design, only the functional characteristics of the elements described are indicated. In
the figures a typical implementation is represented in third angle projection.
Figure 1 is a general view of the cartridge
Figure 2
illustrates the Reference Planes
Figure 3 shows the front side of the case, which lies in Plane Z
Figure 4 shows the top side of the case
Figure 5 shows the rear side of the case
Figure 6 shows the left side of the case, which lies in Plane Y
Figure 7 is Section A-A of figure 4
Figure 8 is Section B-B of figure 3
Figure 9 shows the bottom side of the case, which lies in Plane X
Figure 10 shows the right side of the case
Figure 11 is Detail C of figure 10
Figure 12 is a cross-section of the hub and brake assembly with the cartridge held in the hand
Figure 13 is a cross-section of the hub and brake assembly with the cartridge in the drive
Figure 14 shows a view of the teeth of the locking mechanism
Figure 15 is Detail W of figure 13
Figures 16 to 24 show details of the leader block
8.2 Reference Planes of the case (figure 2)
Where they are purely descriptive, the dimensions are referenced to three orthogonal References Planes - X, Y and Z. Where
the dimensions are related to the position of the cartridge mounted in the drive, they may be referenced to another plane of the
cartridge, Plane P.
Plane X is defined by three circular locating areas, X 1, X2 and X,, in the bottom side of the case. Plane Y is perpendicular to
Plane X and is determined by two reference points, Y, and Y,, on the left hand side of the case. Plane Z is perpendicular to
Plane X; reference point Z, shall lie in Plane Z.
8.3 Dimensions of the case
The dimensions of the case shall be measured in the Test Environment. The dimensions of the case in any operating
specified in this clause.
environment can be estimated from the dimensions
8.3.1
Overall dimensions (figures 3,4 and 5)
The total length of the
...
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