ISO/IEC 9661:1994 PDF

Name: ISO/IEC 9661:1994 — Information technology — Data interchange on 12,7 mm wide magnetic tape cartridges — 18 tracks, 1 491 data bytes per millimetre
SKU: ISO/IEC 9661:1994
Price: 25 EUR
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Information technology — Data interchange on 12,7 mm wide magnetic tape cartridges — 18 tracks, 1 491 data bytes per millimetre

Название (английский):

ISO/IEC 9661:1994

Information technology — Data interchange on 12,7 mm wide magnetic tape cartridges — 18 tracks, 1 491 data bytes per millimetre

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 51
Дата публикации:: 22 декабря 1994 г.
Издание:: ISO/IEC IS 9661 edition 2 version 1
ICS:: 35.220.23

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Описание (английский):

Cancels and replaces the first edition (1988). Specifies the physical and magnetic characteristics of a 12,7 mm wide, 18 track magnetic tape cartridge to enable interchangeability of such cartridges. Also specifies the quality of the recorded signals, the format and recording method thus allowing, together with ISO 1001 for magnetic tape labelling, full data interchange by means of such magnetic tape cartridges.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO/IEC 9661:1994 specifies the physical, magnetic and recording characteristics required for interchangeability of 12.7 mm wide magnetic tape cartridges with 18 tracks and a logical density of 1491 data bytes per millimetre. This second edition (1994) cancels the 1988 edition and defines cartridge dimensions, tape materials, signal quality, data format, recording method and environmental/safety conditions to enable reliable data interchange and long‑term compatibility.

Key topics and technical requirements

Physical tape and cartridge parameters

Tape width: 12.650 mm ± 0.025 mm; minimum tape length 165 m
Total tape thickness: 0.0259 mm to 0.0337 mm; base material nominal thickness 0.0234 mm
Cartridge mechanical features: case dimensions, write‑inhibit, leader block, reel hub, toothed rim, stacking ribs, and locking/latching mechanisms

Magnetic and recording characteristics

18 tracks layout, track positions, track width and azimuth specifications
Physical recording density expressed in flux transitions per mm and bit cell length definitions (average, short‑term, long‑term)
Signal quality metrics: average signal amplitude, resolution, overwrite performance, Narrow‑Band SNR, missing pulses and coincident missing pulse zones

Data format and error control

Byte and frame structures, Data Blocks, Prefix/Suffix, preamble/postamble and Beginning/End of Data Marks (BDM/EDM)
Error Correcting Code (ECC) mechanisms: Diagonal Redundancy Check (DRC) and Vertical Redundancy Check (VRC) and ECC layout
Density Identification Burst, Interblock Gaps, Erase Gaps and Tape Marks for tape navigation and format identification

Environmental, testing and safety

Test conditioning and operating ranges (e.g., testing at 23 °C ±2 °C, RH 40–60%)
Storage and operation environments, flammability and transportation recommendations

Reference materials

Use of Master and Secondary Standard Reference Tapes (traceable to NIST) and test recording current definitions

Applications and who uses this standard

ISO/IEC 9661:1994 is used by:

Tape cartridge and media manufacturers to design and certify compliant products

Tape drive and data storage hardware vendors ensuring mechanical/electrical compatibility

Data center operators, archival institutions and IT integrators managing long‑term tape interchange

Test laboratories and quality engineers performing conformance and calibration checks

Data recovery specialists needing format, ECC and track layout details

Practical benefits include guaranteed interchangeability, predictable signal performance, and defined error‑correction/format rules that support reliable data exchange between systems.

Related standards

ISO 1001 - magnetic tape labelling (used together for full interchange)

ISO/IEC 646, ISO/IEC 2022 and ISO/IEC 4873 - character encoding referenced for byte/character definitions

Keywords: ISO/IEC 9661:1994, 12.7 mm magnetic tape cartridge, 18 tracks, tape format, data interchange, magnetic tape specifications, ECC, DRC, VRC, tape cartridge standard.

ISO/IEC 9661:1994 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses this standard

Related standards

Технические детали

SIST EN ISO 10012:2026

Quality management - Requirements for measurement management systems (ISO 10012:2026)

ISO/IEC 646:1991

Information technology — ISO 7-bit coded character set for information interchange

ISO/IEC 2022:1994/Cor 1:1999

Information technology — Character code structure and extension techniques — Technical Corrigendum 1

ISO/IEC 4873:1991

Information technology — ISO 8-bit code for information interchange — Structure and rules for implementation