ISO IEC 14417:1999 pdf download – Information technology一Data recording format DD-1 for magnetic tape cassette conforming to ISO/IEC 1016

ISO IEC 14417:1999 pdf download – Information technology一Data recording format DD-1 for magnetic tape cassette conforming to ISO/IEC 1016 .
ISO IEC 14417 specifies the media characteristics, the recorded tape format and tile structure requirements to enable information interchange between information processing systems using 19.0 mm wide magnetic tape and cassette conforming to IEC 61016 Section 2.
1.1 Purpose
The purpose of this International Standard is to deline the formit necessary to ensure information interchange at acceptable performance levels.
The intcrchangc panics complying with the applicable standards should be able to achieve compatibility without the need for additional exchange of technical information.
2 Conformance
2.1 Magnetic tape cassettes
Each size / capacity of magnetic tape casscttc shall be in conformance with this International Standard if it satisfies all mandatory requirements of this International Standard and IEC 61016 Section Two. If both Standards specify the same subjects differently. then this International Standard shall prevail. The tape requirements shall be satisfied throughout the extent of the tape.
2.2 Generating systems
A system generating a magnetic tape cassette for interchange shall be entitled to claim conformance with this International
Standard if all the recordings that it makes on a tape according to 2.1 meet the mandatory requirements of this International
Standard. If there is a choice. e.g. cassette size, at least one shall meet the mandatory requirements of this International
Standard.
2.3 Receiving systems
A system receiving a magnetic tape cassette for interchange shall be entitled to claim conformance with this International Standard if ii is able to handle any recording made on the tape according to 2.1. If there is a choice. e.g. tape thickness, at least one shall meet the mandatory requirements of this International Standard.
3 Normative References
The following normative documents contain provisions which, through reterence in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to. or revisions ot any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
ISO/IEC 646:1991, Information technology — ISO 7-his coded character .cet for snfornwnon interchange.
ISO 1001: 1986, Information processing — File structure and labelling of magnetic (ape.s for ,nfonnauon interchange.
IEC 61016, Helical-scan digital component video ens seifr re(’ording sysie,n using 19mm magnetic tape (fimwr D-1).
Section 2 — Videotape cassette.
4 Definitions
4.1 Auxiliary data
Optional i ,iformat ion of secondary importance.
4.2 Annotation record
The magnetization pattern or associated information recorded in the annotation track.
4.3 Annotation tracks
Two longitudinal tracks one each at each tape edge.
4.4 A’erage Signal Amplitude (ASA)
The average peak-to-peak value of the signal output of thc read head measured over a minimum of 280 (XX) flux transitions. exclusive of dropouts.
4.5 azimuth
The angular deviation, in degrees and minutes of arc, of the recorded flux transitions on a track from the line perpendicular to
the track centerline.
4.6 block
A group of bytes transported between host and controller as a unit and considered a minimum locatable unit; containing one or
more logical records or portions of logical records.
4.7 byte
An ordered set of 8 bits acted on as a unit.
4.8 Codeword Digital Sum (CI)S)
The digital sum variation from the beginning to the end of a NRZkI) symbol’s wavefonn. The CDS is calculated assuming that the NRZI( I) waveform starts at a negative level, the binary – I and + I. and the waveform transitions arc centred relative to the corresponding hit cells.
4.9 1)ata area
An area on tape that is defined by the end points of all possible helical track center lines.
4.10 Data area reference line
A basic dimension which shall be exactly 1,8075 mm from the rape reference edge tno tolerence.
4.11 Data area reference point
The point on the centrclinc of a helical track at the boundry between preamble run-up and preamble sync pattern.
4.12 l)ata field
A continuous string of hits that is error protected.
4.13 1)igital Sum Variation (DSV)
The accumulated sum of the CDS values of the NRZIt 1) symbols.
4.14 Dropout
The point of read signal amplitude below a given threshold.