ISO IEC 15307:1997 pdf download – lnformation technology -Data interchangeon 12,7 mm 128-track magnetic tape cartridges—DLT 4 format

ISO IEC 15307:1997 pdf download – lnformation technology -Data interchangeon 12,7 mm 128-track magnetic tape cartridges—DLT 4 format.
ISO IEC 15307 specifies the physical and magnetic characteristics of a 12.7 mm wide. 128-track magnetic tape
cartridge, to enable interchangeability of such cartridges. tt also specifies the quality of the recorded signals, a format – called
Digital Linear Tape 4 (DLT 4) – and a recording method. Together with a labelling standard. for instance ISO 1001 for
Magnetic Tape Labelling. it allows full data interchange by means of such magnelic tape cartridges.
2 Conformance
2.1 Magnetic tape cartridges
A magnetic tape cartridge shall be in conformance with this International Standard if it satislies all mandatory requirements of
this International Standard. The tape requirements shall be satisfied throughout the estent of the tape.
2.2 Generating systems
A systcm gcncrating a magnctic tape cartridgc for intcrchangc shall be entitled to claim conformance with this International
Standard if all the recordings ihat it makes on a tape according to 2.1 meet the mandatory requirements of this International
Standard.
2.3 Receiving systems
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 a tape according to 2.1.
3 Normative references
The following contain provisions which, through reference in this text. consitute 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 ISO maintain registers of currently valid International Standards.
ISO 1986. Information processing — File structure and labelling of magnetic tapes for information interchange. ISO 13412:1992. Technical drawings — Method of indicating surface texture,
4 Definitions
For the purposes of this International Standard, the following definitions apply.
4.1 Average Signal Amplitude
The average peak-to-peak value of the output signal from the read head at the physical recording density of 2 142 fipmnt measured over a minimum length of track of 25.4 mm, exclusive of missing pulses.
4.2 azimuth
The angular deviation, in minutes of arc, of the mean flux transition line of the recording made on a track from thc line normal to the Reference Edge.
4.3 back surface
The surface of the tape opposite the magnetic coating which is used to record data.
4.4 Beginning-Of-Tape marker (BOT)
A hole punched on the centreline of the tape towards the end nearest to the leader.
4.11 Entity
A group of ten Logical Blocks treated as a logical unit and recorded on a logical track.
4.12 Error-Correcting Code (ECC)
A mathematical computation yielding check bytes used for the correction of errors detected by the CRC arid the EDC
4.13 flux transition position
The point which exhibits the maximum freespace flux density normal to the tape surface.
4.14 flux transition spacing
The distance on the magnetic tape between successive flux transitions.
4.15 Logical Block
The two physical blocks simultaneously written on. or read from, the Iwo physical iracks of a logical track.
4.16 logical track
A pair of physical tracks that arc written or read simultaneously.
4.17 magnetic tape
A tape tha accepts and retains magnetic signals intended for input, output. arid storage purposes on computers and associated
equipment.
4.1w Master Standard Reference ‘I’ape
A tape selected as the standard for reference field, signal amplitude, resolution. peakshift, and overwrite characteristics,
Noc. The Mcicr Standard Reference Tape has been e%iahlibed by die Quanum Corporation
4.19 object
A Record or a Tape Mark Block.
4.20 page
A logical division of a physical block.
4.21 physIcal block
A set of contiguous bytes recorded on a physical track and considered as a unit.