ISO/IEC 11559:1993
(Main)Information technology — Data interchange on 12,7 mm wide 18-track magnetic tape cartridges — Extended format
Information technology — Data interchange on 12,7 mm wide 18-track magnetic tape cartridges — Extended format
Specifies the physical and magnetic characteristics to enable interchangeability of the cartridges, the quality of the recorded signals, the format and the recording method, thus allowing, together with ISO 1001, full data interchange, extensions to the transformation of data before it is formatted as in ISO 9661. Cartridge and recording method being identical with those described in ISO 9661. The permissible routes for the flow of data are shown in annex H.
Technologies de l'information — Échange de données sur cartouche de bande magnétique de 12,7 mm de large à 18 pistes — Format étendu
General Information
Standards Content (Sample)
INTERNATIONAL
ISO/IEC
STANDARD
11559
First edition
1993-08-I 5
Information technology - Data
interchange on 12,7 mm wide 18-track
magnetic tape cartridges -( Extended
format
Technologies de /‘information - khange de don&es sur cartouche de
bande magngtique de 12,7 mm de large 3 18 pistes - Format ktendu
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ISO/IEC 11559:1993 (E)
Page
Contents
1
Section 1 - General
1 Scope
2 Conformance
21 . Magnetic tape cartridge
Generating system
22 .
23 . Receiving system
3 Normative references
2
4 Definitions
2
41 . algorithm
2
42 . Average Signal Amplitude
2
43 . back surface
2
44 . Beginning of Tape (BOT)
2
45 . byte
2
46 . cartridge
2
47 . Cyclic Redundancy Check Character
. Data Block
48
49 . Data Records
Processed Data Record (PDR)
4.9.1
4.9.2 Host Data Record
4.9.3 Logical Data Record (LDR)
4.9.4 User Data Record (UDR)
4.10 Error Correcting Code
4.11 flux transition position
flux transition spacing
4.12
4.13 magnetic tape
4.14 Master Standard Reference Tape
4.15 Packet
4.16 Packet Identifier
4.17 Packet Trailer
.
o lSO/lEC 1993
All rights reserved. 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 per-
mission in writing from the publisher.
I SO/I EC Copyright Off ice l Case Postale 56 l W-1 211 Geneve 20 l Switzerland
Printed in Switzerland
ii
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ISOIIEC 11559:1993 (E)
4.18 pad byte
4.19 physical recording density
Postamble
4.20
4.21 Preamble
Processed Data
4.22
4.23 processing
4.24 Reference Field
Secondaq Standard Reference Tape
4.25
4.26 Standard Reference Amplitude (SRA)
4.27 Standard Reference Current
4.28 Test Recording Current
4.29 track
4.30 Typical Field
4.31 transformation
4
5 Conventions and notations
* Representation of numbers
51
52 . Names
Acronyms
53 .
6 Environment and safety
61 . Cartridge/Tape testing environment
62 . Cartridge operating environment
. Cartridge storage environment
63
64 . Safety requirements
6.4.1 Safeness
6.4.2 Flammability
5
6.5 Transportation
6
- Characteristics of the tape
Section 2
6
7 Characteristics of the tape
6
71 . Material
6
Tape length
72 .
6
73 . Tape width
6
74 . Tape discontinuity
6
. Total thickness of tape
75
6
76 . Base material thickness
6
77 l Longitudinal curvature
6
Out-of-plane distortions
78 .
6
79 Cupping
7
Dynamic frictional characteristics
7’10 .
7.10.1 Frictional drag between the recording surface and the tape back surface
7.10.2 Frictional drag between the tape recording surface and ferrite after environmental cycling
Coating adhesion
7.11
7.12 Flexural rigidity
Electrical resistance of coated surfaces
7.13
7.14 Tape durability
7.15 Inhibitor tape
. . .
111
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ISOIIEC 11559: 1993 (E)
9
Tape abrasivity
7.16
10
7.17 Pre-recording condition
Magnetic recording characteristics
7.18
7.18,P Typical Field
7.18.2 Signal amplitude
7.18.3 Resollution
Overwrite
7.18.
7.1S15 Narrow-band signal-to-noise ratio (
Tape quality
7.19
12
7.19.8 Missing pulses
12
.2 Missing pulse zones
12
,3 Coincident missing pulse zones
12
Section 3 - Cartridge
mechanical characteristics of the ca-aridge
8 Dimensional an
bit mechanism
Label area of the rear side
Label area of the top side
Case opening
Locating notches
Locating areas
Inside configuration of the case around the case o
ther external dimensions of the case
Central window
Stacking ribs
Flexibility of the case
Requirements
16
ocedure
Tape reel
Characteristics of the toothed ri
Latching mechanis
Tape wind
Wind tension
21
Circumference of the tape reel
21
Moment of inertia
28
Section 4 - Recording method and for
28
9 Method of recording
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ISO/IEC 11559:1993 (E)
28
91 . Physical recording density
92 . Bit cell length 28
28
93 . Average bit cell length
94 . Long-term average bit cell1 length 28
28
95 e Short-term average bit cell length (STA)
28
96 . Rate of change
Bit shift 28
97 0
29
98 * Total character skew
29
Read signal amplitude
99
29
9’10 . Coincident missing pulse zones
29
10 Track format
29
10.1 Number of tracks
29
10.2 Reference edge
29
10.3 Track positions
29
Track width
PO*4
30
1o.s Azimuth
30
11 Packet format
30
11.1 Packet elements
30
11.2 Packet ID
31
11.3 UDR
31
ILL4 Packet Trailer
31
Packet Trailer when data has been processed
lL4.1
31
1%.4,2 Packet Trailer when data has not been processed
32
12 Data Block format
32
12.1 Data Part
32
12,l.l Packet Bytes
32
12.1,2 Count Field Bytes
32
12.1.3 Block-ID Bytes
33
12.2 Allocation of Data Bytes to frames
34
12,2.1 Prefix Frames
34
12.2.2 Data Frames
35
12.2.3 Residual Frame 1
35
2
12.2.4 Residual Frame
37
12.2S Suffix Frames
37
12.3 Error Correcting Code (KC)
38
12.3. Diagonal Redundancy Check (DRC)
38
12,3,2 VerticaI Redundancy Check (VW)
38
12.3,3 ECC Format
39
12,3.4 Summary of ECC2)
40
12.4 Recording of 8-bit bytes on the tape
40
12.5 Recorded Data Block
40
12.5,l Preamble
41
12.5.2 Beginning of Data Mark (BDM)
V
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ISO/IEC 11559: 1993 (E)
41
12.53 Resync Control Frame
41
12.5.4 End of Data Mark (EDM)
41
12.55 Postamble
41
12.6 Data Density
41
13 Tape format
42
13.1 Density Identification Burst
42
13.2 ID Separator Burst
42
13.3 Interblock Gaps
43
13.4 Erase Gaps
43
13.4.1 Normal Erase Gaps
43
13.4.2 Elongated Erase Gaps
43
13.5 Tape Marks
44
13.6 Relationship between Interblock Gaps, Erase Gaps and Tape Marks
44
13.6.1 Interblock Gap followed by a Tape Mark
44
13.6.2 Tape Mark followed by an Interblock Gap
44
Interblock Gap followed by an Erase Gap
13.6.3
44
13.6.4 Erase Gap followed by an Interblock Gap
45
13.6.5 Summary of the relationship between Interblock Gaps, Erase Gaps and Tape Marks
45
13.7 First and last recording on the tape
46
13.8 Summary of the tape format
47
13.9 Transform Change Records (TCRs)
Annexes
49
A - Recommendations for transportation
50
B - Inhibitor tape
51
C - Tape abrasivity measurement procedure
53
D - Recommendations on tape durability
54
E - Pre-recording condition
55
F - Representation of 8-bit bytes by 9-bit patterns
58
G - Measurement of bit shift
60
H - Summary of data flow
61
J - Implementation of a CRC
62
K - Calculation of a Physical Position Indicator
vi
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ISO/IEC 11559:1993 (E)
Foreword
IS0 (the International Organization for Standardization) and IEC (the Inter-
national Electrotechnical Commission) form the specialized system for
worldwide standardization. National bodies that are members of IS0 or
IEC participate in the development of International Standards through
technical committees established by the respective organization to deal
with particular fields of technical activity. IS0 and IEC technical com-
mittees collaborate in fields of mutual interest. Other international organ-
izations, 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, lSO/IEC JTC 1. Draft International Standards adopted
by the joint technical committee are circulated to national bodies for vot-
ing. Publication as an International Standard requires approval by at least
75 % of the national bodies casting a vote.
International Standard lSO/IEC 11559 was prepared by European Com-
puter Manufacturers Associations (as ECMA-152) and was adopted, under
a special “fast-track procedure”, by Joint Technical Committee lSO/IEC
JTC 1 I Information technology, in parallel with its approval by national
bodies of IS0 and IEC.
Annexes C, E, F, G and K form an integral part of this International Stan-
dard. Annexes A, B, D, H and J are for information only.
vii
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ISO/IEC 11559~1993 (E)
Introduction
ISO/IEC 11559 incorporates all the specifications of IS0 9661, together with extensions and modifications which
specify the additional features of an extended format that also allows higher capacities to be achieved. The
specifications of the tape, cartridge, recorded signal, recording method and most of the recorded format are identical
with those in IS0 9661.
It is not intended that this International Standard replaces IS0 9661. Existing drives and cartridges which conform to
IS0 9661 will continue to do so and will not conform to all requirements of this International Standard o Drives
conforming to this International Standard will be able to write on, and read from, cartridges conforming to IS
. . .
VII1
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INTERNATIONAL STANDARD ISO/IEC 11559:1993 (E)
- Data interchange on 12,7 mm wide l&track magnetic tape
Information technology
cartridges - Extended format
Section 1 - General
1 Scope
This International Standard specifies the physical and magnetic characteristics of a 12,7 mm wide, l&track magnetic
tape cartridge, to enable interchangeability of such cartridges. It also specifies the quality of the recorded signals, the
format and the recording method, thus allowing, together with IS0 1001, full data interchange by means of such
magnetic tape cartridges.
The cartridge and recording method are identical with those described in IS0 9661. This International Standard
specifies extensions to the transformation of data before it is formatted as in IS0 9661.
These extensions
specify a method for increasing the utilization of the tape by combining smaller blocks of data into extended
blocks;
specify a method for identifying whether the recorded data has been processed and, if it has been processed, the
algorithm used for processing;
-
specify a method for including recorded data blocks conforming to this International Standard and recorded data
blocks conforming to IS0 9661 on the same tape.
The pelnissible routes for the flow of data are shown in annex H.
2 Conformance
21 . Magnetic tape cartridge
A magnetic tape cartridge shall be in conformance with this International Standard if
- the cartridge meets all the requirements of clauses 4 and 6 to 8;
the recording on the tape meets the requirements of clauses 9 to 13;
-
- for each recorded packet the algorithm used for processing the data therein, if processed data has been recorded,
has (have) been registered and the registered identification is included in Byte 13 of the Packet ID Block of this
packet (see 11.2).
-
Note 1 - If the algorithm has not been registered Byte 13 shall be set to (FE).
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 a tape meet the mandatory requirements of this
International Standard. A claim of conformance shall state whether or not one, or more, registered algorithms are
implemented and, if so, the registered number(s) of all implemented algorithm(s).
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.
In particular it shall
- be able to recognize the occurrence of extended blocks and to identify and retrieve data from individual packets
within the extended blocks;
- be able to recognize that the data has been processed, to identify the algorithm(s) used, and to indicate to the host
if it cannot restore the data to its original form;
1
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ISO/IEC 11559: 1993 (E)
- be capable of restoring to its original form data which has been processed according to zero or more registered
algorithms.
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 implemented algorithms.
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 edition of the standards listed below. Members of IEC and IS0 maintain registers of
currently valid International Standards.
Heat-treatable steels, alloy steels andfree-cutting steels - Part 13: Wrought stainless steels.
IS0 683-13:1986,
IS0 1001: 1986, Information processing - File structure and labelling of magnetic tapes for information
interchange.
IS0 1302: 1992, Technical drawings - Method of indicating surface texture on drawings.
IS0 9661: 1986, Information processing - Data interchange on 12,7 mm (0.5 in) wide magnetic tape cartridges
- M-tracks, 1 491 data bytes per millimetre (37 871 data bytes per inch).
ISO/IEC 11576: 1993, Information technology - Procedure for the registration of algorithms for the lossless
compression of data.
4 Definitions
For the purposes of this International Standard, the following definitions apply.
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 the read head measured
over a minimum length of track of 25,4 mm exclusive of missing pulses.
back surface: The surface of the tape opposite the magnetic coating used to record data.
43 .
44 . Beginning of Tape (BOT): The point along the length of the magnetic tape indicated by the start of the
Density Identification Burst.
45 . byte: An ordered set of eight bits acted upon as a unit.
46 . cartridge: A container holding a supply reel of magnetic tape with an attached leader block.
47 . Cyclic Redundancy Check Character: A character represented by two bytes, placed at the end of a byte
string and used for error detection.
48 . Data Block: The data entity resulting from concatenating one or more Packets, and appending control
information.
49 . Data Records
4.9.1 Processed Data Record (PDR): The data entity resulting from the application of an algorithm to a Logical
Data Record.
Host Data Record: The data entity originally compiled by the host.
4.9.2
2
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ISO/IEC 11559: 1993 (E)
4.9.3 Logical Data Record (LDR): The data entity received by the system from the host. It may consist of one or
several Host Data Record(s) depending upon action taken by the host to use extended blocks.
4.9.4 User Data Record (UDR): The data entity available to the Packet former.
When the data has been processed it shall be a PDR.
When the data has not been processed it shall be an LDR.
procedure yielding bits
4.10 Error Correcting Code: A mathematical used for the detection and correct ion of
errors.
4.11 flux transition position: That point which exhibits maximum free-space flux density normal to the surface of
the tape.
4.12 flux transition spacing: The distance along a track between successive flux transitions.
4.13 magnetic tape: A tape which will accept and retain the magnetic signals intended for input, output and
storage purposes on computers and associated equipment.
4.14 Master Standard Reference Tape: A tape selected as the standard for Reference Field, Signal Amplitude,
Resolution and Overwrite.
Note 2 - A Master Standard Reference Tape has been established at the National Institute for Standards and Technology (NISI).
4.15 Packet: A UDR with a Packet Identifier and Packet Trailer added.
4.16 Packet Identifier: The group of 32 bytes added to the beginning of a UDR when forming a Packet.
4.17 Packet Trailer: The group of bytes of variable size appended to a UDR when forming a Packet.
4.18 pad byte: A byte having a bit pattern consisting of eight ZEROS.
4.19 physical recording density: The number of recorded flux transitions per unit length of track, expressed in
flux transitions per millimetre (ftpmm).
4.20 Postamble: A repeated g-bit pattern at the end of a Recorded Data Block providing electronic
synchronization when reading in the reverse direction.
4.21 Preamble: A repeated g-bit pattern at the beginning of a Recorded Data Block providing electronic
synchronization when reading in the forward direction.
4.22 Processed Data: Data which has been processed by an algorithm.
4.23 processing: The use of an algorithm.
4.24 Reference Field: The Typical Field of the Master Standard Reference Tape.
4.25 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 3 - Secondary Standard Reference Tapes have been developed at the National Institute for Standards and Technology (NISI’) and
will be available from the NIST Office of Standard Reference Materials. Room 205, Building 202, National Institute of Standards and
Technology, Gaithersburg. MA 20899, USA, under reference number SRM 3202, until January 2004.
It is intended that these be used for calibrating tertiary reference tapes for use in routine calibration.
3
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ISOlIEC 11559: 1993 (E)
4.26 Standard Reference Amplitude (SRA): The Average Signal Amplitude from the Master Standard Reference
Tape when it is recorded with the Test Recording Current on the NIST measurement system at 972 ftpmm.
Traceability to the Standard Reference Amplitude is provided by the calibration factors supplied with each
Secondary Standard Reference Tape.
4.27 Standard Reference Current: The current that produces the Reference Field.
4.28 Test Recording Current: The current that is 1,5 times the Standard Reference Current.
4.29 track: A longitudinal area on the tape along which a series of magnetic signals may be recorded.
Typical Field: In the plot of the Average Signal Amplitude against the Recording Field at the physical
4.30
recording density of 972 ftpmm, the minimum field that causes an Average Signal Amplitude equal to 85% of
the maximum Average Signal Amplitude.
4.31 transformation: The manipulation of Host Data Records before formatting. It includes the operations of
Processing, the formation of Packets and the concatenation of Packets.
5 Conventions and notations
51 . Representation of numbers
The following conventions and notations apply in this International Standard, unless otherwise stated:
- In each field the bytes shall be arranged with Byte 1, the most significant, first. Within each byte the bits shall be
arranged with Bit 1, the most significant, first and Bit 8, the least significant bit, last. This order applies to the
data, and to the input and output of the error correcting codes and the cyclic redundancy codes.
- Letters and digits in parentheses represent numbers in hexadecimal notation.
- Numbers in binary notation and bit combinations are represented by strings of ZEROS and ONES.
- Numbers in binary notation and bit combinations are shown with the most significant bit to the left.
- The setting of bits is denoted by ZERO or ONE.
. Names
52
The names of entities are given with a capital initial letter.
Acronyms
53 .
Beginning of Data Mark
BDM
BOT Beginning of Tape
Cyclic Redundancy Check
CRC
Diagonal Redundancy Check
DRC
Error Correcting Code
ECC
EDM End of Data Mark
Identifier
ID
LDR Logical Data Record
Narrow band signal-to-noise ratio
NB-SNR
PDR Processed Data Record
Resolution Bandwidth
RBW
Standard Reference Amplitude
SRA
Short Term Average
STA
Transform Change Record
TCR
4
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ISO/IEC 11559:1993 (E)
User Data Record
UDR
VBW Video Bandwidth
Vertical Redundancy Code
VRC
6 Environment and safety
Unless otherwise stated, the conditions specified below refer to the ambient conditions in the test or
computer room
and not to those within the tape equipment.
61 . Cartridge/Tape 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
24 h
before testing:
62 . Cartridge operating environment
Cartridges used for data interchange shall be capable of operating under the following conditions:
temperature: 16 OC to 32 OC
relative humidity: 20 % to 80 %
25 OC max.
wet bulb temperature:
The average temperature of the air immediately surrounding the tape shall not exceed 40,s OC.
Note 4 - Localized tape temperatures in excess of 49 “C may cause tape damage.
conditions
Conditioning before operating: If a cartridge has been exposed during storage and/or tran sportation to
a period of at least 24 h.
outside the above values, it shall be conditioned for
63 . Cartridge storage environment
Cartridges used for data interchange shall be stored under the following conditions.
temperature: 5 OC to 32 OC
5 % to 80 %
relative humidity:
wet bulb temperature: 26 OC max.
Safety requirements
64 .
6.4.1 Safeness
The cartridge and its components shall not constitute any safety or health hazard when used in its intended manner or
in any foreseeable misuse in an information processing system.
6.4.2 Flammability
The cartridge and its components shall be made from materials which, if ignited from a match flame, do not continue
to bum in a still carbon dioxide atmosphere.
65 . Transportation
This International Standard does not specify parameters for the environment in which cartridges should be
transported. Annex A gives some recommendations for transportation.
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ISO/IEC 11559: 1993 (E)
Section 2 - Characteristics of the tape
7 Characteristics of the tape
71 0 Material
The tape shall consist of a base material (oriented polyethylene terephthalate film or its equivalent) coated on one
side with a strong yet flexible layer of ferromagnetic material dispersed in a suitable binder. The back surface of the
tape may also be coated with a ferromagnetic or non-ferromagnetic material.
72
l Tape length
The length of the tape shall not be less than 165 m.
73 . Tape width
The width of the tape shall be 12,650 mm * 0,025 mm. The width shall be measured across the tape from
edge-to-edge when the tape is under a tension of less than 0,28 N.
74 l Tape discontinuity
There shall be no discontinuities in the tape such as those produced by tape splicing or perforations.
75 . Total thickness of tape
The total thickness of the tape at any point shall be between 0,025 9 mm and 0,033 7 mm.
76 . Base material thickness
The thickness of the base material shall be 0,023 4 mm nominal.
77 Longitudinal curvature
.
The radius of curvature of the edge of the tape shall not be less than 33 m.
Procedure
Allow a 1 m length of tape to unroll and assume its natural curvature on a flat smooth surface. Measure the deviation
from a 1 m chord. The deviation shall not be greater than 3,8 mm. This deviation corresponds to the minimum radius
of curvature of 33 m if measured over an arc of circle.
. Out-of-plane distortions
78
All visual evidence of out-of-plane distortion shall be removed when the tape is subjected to a uniform tension of
0,6 N. Out-of-plane distortions are local deformations which cause portions of the tape to deviate from the plane of
the surface of the tape. Out-of-plane distortions are most readily observed when the tape is lying on a flat surface
under no tension.
79 . Cupping
The departure across the width of tape from a flat surface shall not exceed 0,3 mm.
Procedure:
Cut a 1,0 m i 0,l m length of tape. Condition it for a minimum of 3 h in the test environment by hanging it so that
the coated surface is freely exposed to the test environment. From the centre portion of the conditioned tape cut a test
piece of length 25 mm. Stand the test piece on its end in a cylinder which is at least 25 mm high with an inside
diameter of 13,O mm sf: 0,2 mm. With the cylinder standing on an optical comparator measure the cupping by aligning
the edges of the test piece to the reticle and determining the distance from the aligned edges to the corresponding
surface of the test piece at its centre.
6
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ISO/IEC 11559:1993 (E)
7.10 Dynamic frictional characteristics
In the tests of 7.10.1 and 7.10.2 the specified forces of 1,0 N and 1,50 N, respectively, comprise both the force
component of the dynamic friction and the force of 0,64 N applied to the sample of tape.
Note 5 - Particular attention should be given to keeping the suxfaces clean.
7.10.1 Frictional drag between the recording surface and the tape back surface
The force required to move the recording surface in relation to the back surface shall not be less than 1,0 N.
Procedure:
Wrap a test piece of tape around a 25,4 mm diameter circular mandrel with the back surface of the test
a)
piece facing outwards.
Place a second test piece of tape, with the recording surface facing inwards, around the first test piece for a
b)
total wrap angle of 90°.
Apply a force of 0,64 N to one end of the outer test piece of tape. Secure its other end to a force gauge
Cl
which is mounted on a motorized linear slide.
Drive the slide at a speed of 1 mm/s.
d)
7.10.2 Frictional drag between the tape recording surface and ferrite after environmental cycling
The force required to move the tape at a point 1,34 m from the leader block of the cartridge shall not be greater than
1,50 N. The force required at a point 4,3 m from the junction of the tape with the cartridge hub shall not exceed the
first force by more than a factor of 4.
Procedure:
Wind tape on to a spool hub of diameter 50 mm to an outside diameter of 9’7 mm with a winding tension of
a)
2,2 N k 0,2 N.
Repeat the following two steps five times:
b)
1) Store for 48 h at a temperature of 50 OC and a relative humidity of 10% to 20%.
2) Condition in the testing environment for 2 h and rewind with a tension of 2,2 N k 0,2 N.
Condition the tape for 48 h at a temperature of 30,5 OC and a relative humidity of 85%. The tape shall
Cl
remain in this environment for steps d) and e).
Apply a force of 0,64 N to one end of a test piece of not more than 1 m, taken 1,34 m from the leader block.
d)
Pass the test piece over a ferrite rod of diameter 25,4 mm with the recording surface in contact with the rod
for a total wrap angle of 90°.
The rod shall be made from the ferrite specified in annex C. It shall be polished to a roughness value R, of
0,05 pm (roughness grade N2, IS0 1302). Pull the other end of the test piece horizontally at 1 mm/s.
Repeat step d) for a similar test piece taken 4,3 m from the junction of the tape with the cartridge hub.
e)
7.11 Coating adhesion
See figure 1.
The force required to peel any part of the coating from the tape base material shall not be less than 1,5 N.
Procedure:
Take a test piece of the tape approximately 380 mm long and scribe a line through the recording coating
a)
across the width of the tape 125 mm from one end.
7
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ISO/IEC 11559: 1993 (E)
Using a double-sided pressure sensitive tape, attach the full width of the test piece to a smooth metal plate,
b)
with the recording surface facing the plate, as shown in the figure below.
Fold the test piece over 180°, attach the metal plate and the free end of the test piece to the jaws of a
C)
universal testing machine and set the speed of the jaw separation to 254 mm per min.
Note the force at which any part of the coating first separates from the base material. If this is less than
d)
1,5 N, the test has failed. If the test piece peels away from the double-sided pressure sensitive tape before
the force exceeds 1,5 N, an alternative type of double-sided pressure sensitive tape shall be used.
If the back surface of the tape is coated, repeat a) to d) for the back coating.
e)
surf ace
Recording
z Pressure-sensitive
4 125 mm
tape
Figure 1 - Coating adhesion
7.12 Flexural rigidity
The flexural rigidity of the tape in the longitudinal direction shall be between 0,06 N-mm2 and 0,16 N*mm2.
Procedure:
Clamp a 180 mm test piece of tape in a universal testing machine, allowing a 100 mm separation between the
machine jaws. Set the jaw separation speed at 5 mm per minute. Plot force against distance. Calculate the flexural
rigidity using the slope of the curve between 2,2 N and 6,7 N by the formula
6FlWT
-
-
E
6LIL
z=m3/ 12
Flexural rigidity = El
where
SF is the change in force in newtons;
T is the measured thickness in millimetres;
is the measured width in millimetres;
W
6LIL is the change in sample length between the jaws divided by the original length between the jaws.
7.13 Electrical resistance of coated surfaces
The electrical resistance of any square area of the recording surface shall be within the range
8
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ISOIIEC 11559:1993 (E)
- 1Q5 Q to 5 x IO8 sll for non-backcoated tapes;
- lo5 a to 5 x 109 SJ for backcoated tapes.
The electrical resistance of any backcoating shall be less than lo6 a.
Procedure:
Condition a test piece of tape to the test environment for
...
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