ISO IEC 16382 pdf download – Information technology — Data interchange on 1 2,7 mm 208-track magnetic tape cartridges — DLT 6 format

ISO IEC 16382 pdf download – Information technology — Data interchange on 1 2,7 mm 208-track magnetic tape cartridges — DLT 6 format
This International Standard specifies the physical and magnetic characteristics of a 12,7 mm wide,208-track magnetic tapecartridge, to enable physical interchangeability of such cartridges between drives. It also specifies the quality of the recordedsignals, a format – called Digital Linear Tape 6 (DLT 6) – and a recording method, thereby allowing data interchange betweendrives. Together with a labelling standard,for instance International Standard ISO 1001 for Magnetic Tape Labelling, it allowsfull data interchange by means of such magnetic tape cartridges.
2Conformance
2.1 Magnetic tape cartridges
A magnetic tape cartridge shall be in conformance with this International Standard if it satisfies all mandatory requirements ofthis Standard.The tape requirements shall be satisfied throughout the extent of the tape.
2.2Generating systems
A system generating a magnetic tape cartridge for interchange shall be in conformance with this International Standard if allthe recordings that it makes on a tape according to 2.1 meet the mandatory requirements of this International Standard.
In addition, a claim of conformance shall state
– whether or not one,or more registered algorithm(s) are implemented within the system, and are able to compress data
received from the host prior to collecting the data into blocks, and
– the registered identification number(s) of the implemented compression algorithm(s).2.3Receiving systems
A system receiving a magnetic tape cartridge for interchange shall be in conformance with this International Standard if it isable to handle any recording made on a tape according to 2.i.
In addition, it shall
whether or not one, or more de-compression algorithm(s) are implemented within the system, and are able to be applied tode-compress data prior to making such data available to the host,
the registered identification number(s) of the implemented compression algorithm(s).
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 investigate 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 IEC maintain registers of currently valid International Standards.ISO1001:1986, lnformation processing —File structure and labellig of magnetic tapes for information interchange.
ISO 1302:1992,Technical drawings — Method of indicating surface texture.
ISO/IEC 11576:1994, lnformation technology — Procedure for the registration of algorithms for the lossless compression ofdata.
4Terms and definitions
For the purposes of this International Standard, the following terms and 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 2 578 fipmm measured over a minimum length of track of 25,4 mm, exclusive of missing pulses.
4.2
azimuth:The angular deviation, in degrees of arc, of the mean flux transition line of the recording made on a trackfrom a 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 theleader.
4.5block: A set of contiguous bytes recorded on a physical track and considered as a unit.4.6byte: An ordered set of bits acted upon as a unit.
NOTE – In this International Standard, all bytes are 8-bit bytes.
4.7cartridge: A case containing a single supply reel of 12,7 mm wide magnetic tape with a leader attached at the outer
end.
4.8
Cyclic Redundancy Check (CRC) character: A 64-bit character,generated by a mathematical computation,used for error detection.
4.9 Early Warning(EW): A signal generated by the drive indicating the approaching end of the recording area.4.10 Error-Detecting Code(EDC): A mathematical computation yielding check bytes used for error detection.
4.11 End-Of-Tape marker (EOT): A hole punched on the centreline of the tape towards the end farthest from theleader.
4.12 Entity: A group of twenty blocks treated as a logical unit and recorded on a logical track, except Filler Blocks, if any.4.13 Error-Correcting Code (ECC): A mathematical computation yielding check bytes used for the correction oferrors detected by the CRC and the EDC.
4.14 Envelope: A group of Entities.
4.15 Envelope size: The number of Entities in an Envelope.
4.16flux transition position: The point which exhibits the maximum free-space flux density normal to the tape surface.4.17flux transition spacing: The distance on the magnetic tape between successive flux transitions.
4.18 Group Record: A Record consisting of a series of Records of equal size.
4.19logical track: A group of four physical tracks that are written or read simultaneously.
4.20magnetic tape: A tape that accepts and retains magnetic signals intended for input, output, and storage purposes on
computers and associated equipment.
4.21 Master Standard Reference Tape: A tape selected as the standard for Reference Field，signal amplitude,
resolution, peakshift, and overwrite characteristics.
NOTE – The Master Standard Reference Tape has been established by the Quantum Corporation.4.22object: A Record or a page of type Tape Mark.
4.23page: A logical division of a block.
4.24physical recording density: The number of recorded flux transitions per unit length of track, expressed in flux
transitions per millimetre (ftpmm).
4.25physical track: A longitudinal area on the tape along which a series of magnetic signals can be recorded.4.26 Record: A collection of User Bytes, the number of which is determined by the host.