ISO IEC 17913 pdf download – Information technology — 1 2,7 mm 128-track magnetic tape cartridge for information interchange — Parallel serpentine format

ISO IEC 17913 pdf download – Information technology — 1 2,7 mm 128-track magnetic tape cartridge for information interchange — Parallel serpentine format
Section 1 – General1Scope
This International Standard specifies the physical and magnetic characteristics of a magnetic tape cartridge, using a magnetictape 12,7mm wide, so as to provide physical interchange of such cartridges betwcen drives.It also specifies the quality of therecorded signals，the recording method and the recorded format known as Parallel Serpentine,thereby allowing datainterchange between drives by means of such cartridges. The format supports variable length Logical Records, high speedsearch, and the use of the algorithm for data compression specified in International Standard ISOVIEC 15200.
Information interchange between systems also requires, at a minimum, agreement between the interchange parties upon theinterchange code(s) and the specification of the structure and labelling of the information on the interchanged cartridge.
Together with a standard for volume and file structure, e.g. International Standard IS0 1001, this International Standardprovides for full data interchange between data processing systems.
2Conformance
2.1 Magnetic tape cartridge
A tape cartridge shall be in conformance with this International Standard if it meets all the mandatory requirements specifiedherein.The tape requirements shall be satisfied throughout the extent of the tape.
2.2Generating system
Agenerating system shal be in conformance with this International Standard if it generates a tape according to 2.1.2.3Receiving system
A receiving system shall be in conformance with this International Standard if it can read all tapes according to 2.1.3Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of thisInternational Standard. For dated references subsequent amendments to, or revisions of, any of these publications do notapply. However, parties to agreements based on this International Standard are encouraged to investigatec the possibility ofapplying the most recent editions of the normative documents indicated below.For undated references, the latest edition of thenormative document referred to applies. Members of lSO and lEC maintain registers of currently valid lnternational Standards.ISO 1001: 1986, Information processing —File structure and labelling of magnetic tapes for information interchange.
IEC 60950:1999, Safety of information technology equipment.
ISO/IEC 15200:1996,Information technology—Adaptive Lossless Data Compression algorithm (ALDC).ISO/R 527:1966,Plastics — Determination of tensile properties.
ISO/IEC 646:1991, Information technology — ISO 7-bit coded character set for information interchange.ISO 683-13:1986,Heat-treatable steels, alloy steels and free-cutting steels — Part 13: Wrought stainless steels.ANSI MH10.8M-1993,Materials Handling — Unit Loads and ‘Transport Packages — Bar Code Symbols4Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.4.1algorithm: A set of rules for transforming the logical representation of data.
4.anhysteretic erase: A process of erasure utilising an alternating magnetic field of decaying level.
4.3
average signal amplitude: The average peak-to-peak value of the signal output measured over a minimumof 25,4 mm, exclusive of missing pulses.
4.4
azimuth: The angle, in minutes of arc, of the mean flux transition line of a track from a line normal to thetape Reference Edge.
4.5
back surface: The surface of the tape opposite the recording surface.
4.6beginning of partition (BOP): The point along the length of the tape where recording in any partition
begins.
4.7
beginning of tape (BOT): The point along the length of the magnetic tape，indicated by the start ofrecorded information.
4.8
cartridge: A container holding a single supply reel of magnetic tape with an attached leader block at theBOT end.
4.9cyclic redundancy check (CRC) character: A four-byte character used for error detection.4.10end of tape (EOT):The point on a track farthest from BOT up to which recording is allowed.4.11error-correcting code (ECC): An algorithm yielding bytes used for error detection and correction.4.12error-detecting code (EDC): An algorithm yielding bytes used for error detection.
4.13 File Mark: A recorded element requested by a host that marks the end of a host data file or aggregate.4.14flux transition position: The point on the magnetic tape that exhibits the maximum free-space flux density
normal to the tape surface.
4.15 flux transition spacing: The distance along a track between successive flux transitions.4.16 half-wrap: A track group recorded in the physical forward or physical reverse direction.
4.17logical block: User data or a File Mark that is received as input by the system or that is sent as output from
the system.
4.18logical forward: The direction of tape motion that results in finding an ascending order of device block
identifiers.
4.19 logical reverse: The direction of tape motion that results in finding a descending order of device block
identifiers.
4.20magnetic tape: A tape that accepts and retains magnetic signals intended for input, output, and storage of
data for information processing.
4.21 mark tach count:The value of the tach counter that exists at the starting point of an Interblock Gap prior
to the first device block of a mark.
4.22 Master Standard Reference ‘Tape: A tape selected as the standard for Reference Field, signal amplitude,
resolution, and broad-band signal-to-noise ratio.
Note – A Master Standard Reference Tape has been established at Imation Corporation.
4.23physical recording density: The number of recorded flux transitions per unit length of track expressed in
flux transitions per millimetre (ftpmm).
4.24pre-record condition: The condition of the magnetic tape in preparation for data recording that has beenanhysteretically erased and subsequently servo written.
4.25recorded element: A File Mark or a logical block.
4.26 Reference Field: The Typical Field of the Master Standard Reference Tape.
4.27resync character: A control character identifying format resynchronisation points in a track. Ilt is intendedthat read-back circuits be capable of resynchronising operations when such characters are sensed.
4.28 SDM set: The group of SDM marks delineated by the beginning and end SDM marks，containing any
number of included middle SDM marks including zero middle SDM marks.