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

Status
Published
Publication Date
04-Sep-1996
Current Stage
9093 - International Standard confirmed
Start Date
20-Sep-2007
Completion Date
21-Aug-2020
Ref Project

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ISO/IEC 14840:1996 - Information technology -- 12,65 mm wide magnetic tape cartridge for information interchange -- Helical scan recording -- Data-D3-1 format
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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)
---------------------- Page: 1 ----------------------
ISO/IEC 14840:1996 (E)
Page
Contents
Section 1 - General
1 Scope
2 Conformance
2.1 Magnetic tape cartridge
2.2 Generating system
2.3 Receiving system
3 Normative References
4 Definitions
4.1 a.c. erase
4.2 algorithm
4.3 Average Signal Amplitude
4.4 azimuth
4.5 back surface
4.6 Beginning of Tape (BOT)
4.7 Beginning of Tape Sense Slot
4.8 byte
4.9 cartridge
4.10 character
4.11 Codeword Digital Sum (CDS)
4.12 Cyclic Redundancy Check (CRC) Character
4.13 Data Area Reference Point
4.14 Data Records
4.14.1 Logical Data Record (LDR)
4.14.2 Processed Data Record (PDR)
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
---------------------- Page: 2 ----------------------
* ISO/IEC 14840:1996 (E)
0 ISOIIEC
4.21 flux transition position
4.22 flux transition spacing
4.23 Helical Time Code (HTC)
4.24 Internal Leader Header (ILH)
4.25 Logical Block Number
4.26 magnetic tape
4.27 Master Standard Reference Tape
4.28 Packet
4.29 Packet identifier
4.30 Packet Trailer
4.31 physical recording density
4.32 Postamble
4.33 Preamble
4.34 processed data
4.35 Reference Fields
4.36 resolution
4.37 Scan Group
4.38 Scan Group Pair
4.39 Scan Group Start Data (SGSD)
4.40 Secondary Standard Reference Tape
4.41 Standard Reference Amplitudes (SRA)
4.42 Standard Reference Currents (Ir)
4.43 Tape Reference Edge
4.44 Test Recording Currents (TRC)
4.45 track
4.46 track angle
4.47 Typical Field (TF)
4.48 Variable Scan Group Header
4.49 zero crossing
5 Conventions and Notations
5.1 Representation of numbers
5.2 Names
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
---------------------- Page: 3 ----------------------
0 ISOIIEC
ISO/IEC 14840: 1996 (E)
8.3.6 Mis-insertion protection
8.3.7 Stacking ribs
8.3.8 Recognition notches
8.3.9 Write-inhibit mechanism
8.3.10 Label areas of the top side
8.3.11 Label areas of the rear side
8.3.12 Label area on the right hand side
8.3.13 Label area on the bottom side
8.3.14 Central window
8.3.15 Case opening
8.3.16 Tapers of the case
8.4 Flexibility of the case
8.4.1 Requirements
8.4.2 Procedure
8.5 Tape reel
Locking mechanism
8.5.1
Axis of rotation of the reel
8.5.2
Metallic insert
8.5.3
8.5.4 Toothed rim
8.5.5 Hub of the reel
8.5.6 Relative positions of hub and case
8.5.7 Characteristics of the toothed rim
8.6 Magnetic tape
8.6.1 Tape wind
8.6.2 Wind tension
8.6.3 Circumference of the tape reel
8.6.4 Moment of inertia
8.7 Leader block
8.7.1 Dimensions of the leader block
8.7.2 Attachment of the tape to the leader block
8.7.3 Latching the leader block
8.8 Reflection density of the case
8.8.1 Requirement
8.8.2 Test Equipment
8.8.3 Test method
8.9 Colour
Section 3 - Requirements for the Unrecorded Tape
9 Mechanical, physical and dimensional characteristics of the tape
9.1 Materials
9.2 Tape length
9.3 Tape width
9.4 BOT and EOT Sense Slots
9.5 Discontinuities
9.6 Thickness
9.7 Longitudinal curvature
9.8 Straightness
9.9 Cupping
9.10 Out-of-plane distortions
9.11 Coating adhesion
9.12 Layer-to-layer adhesion
---------------------- Page: 4 ----------------------
* ISO/IEC 1484031996 (E)
0 ISOIIEC
9.13 Young’s Modulus for the tape
9.14 Surface roughness
9.15 Electrical resistance of coated surfaces
9.16 Tensile strength
9.16.1 Breaking strength
9.16.2 Offset yield strength
9.17 Residual elongation
9.18 Light transmittance of the tape
10 Magnetic Recording Characteristics
10.1 General

10.2 Basis for measuring the magnetic recording characteristics of the unrecorded tape.

10.3 Test conditions
10.4 Typical Field
10.5 Signal Amplitude
10.6 Resolution
10.7 Ease of Erasure
10.8 Narrow-band Signal-to-Noise Ratio (NB-SNR)
10.9 Tape Quality
10.9.1 Missing pulses
10.9.2 Missing pulse zones
Section 4 - Requirements for an Interchanged Tape
11 Format of a helically recorded track
11.1 General description of the write data path
11.1.1 Formation of Packets
11.1.2 Formation of Scan Groups
11.1.3 Channel separation
11.1.4 Interleave buffer
11.1.5 Sync Blocks
11.1.6 Randomization
11.1.7 Logical helical track
11.1.8 Byte translation
11.1.9 Recording of tracks
11.2 Packet format
11.2.1 Packet definition
11.2.2 Packet ID
11.2.3 UDR
11.2.4 Packet Trailer
11.3 Scan Group
11.3.1 Scan Group Start Data (SGSD)
11.3.2 Helical Time Code (HTC)
11.3.3 Header
11.3.4 Data Part
11.3.5 Trailer
11.3.6 Types of Scan Group
11.3.7 Protection of Scan Groups
11.4 Write data channel
11.4.1 Scan Group sections
11.4.2 Interleave Buffer
---------------------- Page: 5 ----------------------
0 ISO/IEC
ISO/IEC 14840: 1996 (E)
11.4.3 Sync Blocks
11.4.4 Layout of a logical helical track
11.4.5 Byte translation
12 Track geometry
12.1 General
12.2 Helically recorded tracks
12.2.1 Track width
12.2.2 Adjacent track pitch
12.2.3 Track angle
12.2.4 Straightness of a track
12.2.5 Track length
12.2.6 Azimuth angles
12.2.7 Location of positive azimuth tracks
12.2.8 Location of Data Area Reference Point
12.3 Time Code Track
12.3.1 Track location
12.3.2 Azimuth
12.4 Servo Control Track
12.4.1 Track location
12.4.2 Azimuth
12.5 Reserved Longitudinal Track
13 Method of recording helical tracks
13.1 Tape condition before recording
13.2 Method of recording
13.3 Physical Recording Densities
13.4 Nominal Bit Cell Length
13.5 Long-term Average Bit Cell Length
13.6 Short-term Average Bit Cell Length (STA)
13.7 Rate of Change of the STA
13.8 Bit shift
13.9 Read signal amplitude
14 Servo Control Track
14.1 Format
14.2 Relative locations of Pulse Pairs and Scan Group Pairs
14.3 Polarity of magnetisation
14.4 Read signal amplitude
14.5 Quality of the Servo Control Track
15 Time Code Track
15.1 Format
15.1.1 Count bits
15.1.2 Supplementary Data
15.1.3 Phase bit
15.1.4 Synchronizing pattern
15.2 Extent of a Time Code
15.3 Relative locations of the Time Code and Scan Group Pairs
15.4 Form of recording
15.4.1 Nominal bit density
15.4.2 Nominal bit cell length
---------------------- Page: 6 ----------------------
ISO/IEC 14840:1996 (E)
0 ISO/IEC
15.4.3 Bit shift
15.5 Read signal amplitude
15.6 Quality of the Time Code Track
16 Tape format
16.1 Layout of the magnetic tape
16.2 Data Area
16.2.1 Capacity of tape sectors
16.2.2 Sequence of Scan Groups on the tape
16.2.3 Write skips
16.2.4 Appended Data
16.3 EOD
Annexes
A - Representation of the CRC used in 11.2 - Packet Format
B- Representation of the CRC used in 11.3 - Scan Group
C - Representation of S-bit bytes by 14-bit patterns
D- Generation of Outer ECC and Inner ECC
E- Measurement of the geometry of helical tracks
F - Measurement of Bit Shift
G - Label - Media type
H - Reflection density of the case
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.
---------------------- Page: 8 ----------------------
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.
---------------------- Page: 10 ----------------------
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.

---------------------- Page: 11 ----------------------
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.

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.
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.

---------------------- Page: 12 ----------------------
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 %
---------------------- Page: 13 ----------------------
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.
---------------------- Page: 14 ----------------------
0 ISOLIEC
ISO/IEC 14840t1996 (E)
Section 2 - Requirements for the Cartridge
Dimensional and Mechanical Characteristics of the Cartridge
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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