ISO 7665:1983

Name: ISO 7665:1983 — Information processing — File structure and labelling of flexible disk cartridges for information interchange
SKU: ISO 7665:1983
Price: 25 EUR
Availability: InStock

Information processing — File structure and labelling of flexible disk cartridges for information interchange

Название (английский):

ISO 7665:1983

Information processing — File structure and labelling of flexible disk cartridges for information interchange

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 22
Дата публикации:: 1 декабря 1983 г.
Издание:: ISO IS 7665 edition 1 version 1
ICS:: 35.220.21

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Цена:25 €

Описание (английский):

Specifies requirements for file structure and labelling of flexible disk cartridges for information interchange between users of different information processing systems, i.e. recorded labels to identify files, file sections and volumes of lexible disk cartridges; basic blocks characteristics containing the record constituting the file; and the file structures. It determines three nested levels of interchange: BASIC INTERCHANGE, EXTENDED INTERCHANGE LEVEL 1, EXTENDED INTERCHANGE LEVEL 2.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7665:1983 - "Information processing - File structure and labelling of flexible disk cartridges for information interchange" defines a standardized way to record labels, blocks and file structures on flexible disk cartridges so information can be exchanged between different information‑processing systems. The standard specifies label formats (Volume, File and Error Map labels), basic block and record characteristics, the organization of disk space (index cylinder, cylinders, tracks, sectors), and three nested levels of interchange: BASIC INTERCHANGE (BI), EXTENDED INTERCHANGE LEVEL 1 (EI) and EXTENDED INTERCHANGE LEVEL 2 (E2).

Key topics and requirements

Labeling conventions: Standardized fields and character coding for the Volume Label (VOL1), File Label (HDR1) and Error Map Label (ERMAP) to identify volumes, files, file sections and defective areas.

Index cylinder (cylinder 00): Reserved for descriptive information. On side 0, physical records on cylinder 00 use a length of 128 data characters; specific sectors on Track 00 are allocated for system use, ERMAP, VOL1 and HDR1 entries.

Blocks, records and files: Definitions and permitted structures for blocks, physical records, fixed‑length, variable‑length, and segmented records; extents (continuous physical-record sequences) and file sectioning across volumes.

Disk organization parameters: Use of parameters such as Cylinder‑Limit, Index‑Sector‑Limit, Data‑Sector‑Limit, and Data‑Physical‑Record‑Length to define space layout and capacity per data interchange standard.

Interchange levels:

BI (Basic Interchange): Minimum facilities for interchange.
EI (Extended Interchange Level 1): Adds blocked fixed‑length records and blocks longer than physical records.
E2 (Extended Interchange Level 2): Adds variable‑length records and segmented records.

Conformance: A cartridge conforms when all labels and interchange files meet ISO 7665 and the applicable flexible disk data interchange standard(s).

Applications - who uses it

Legacy system integrators and data migration engineers preserving or exchanging data stored on 5.25" and 8" flexible disk cartridges.

Data recovery specialists interpreting labels, ERMAP and file structures to recover lost data.

Software developers implementing import/export tools for vintage formats.

Hardware manufacturers of drives and controllers that claim compatibility with standardized interchange formats.

Archives and museums maintaining long‑term access to floppy‑disk‑based records.

Related standards

ISO 5654, ISO 6596, ISO 7487 (flexible disk data interchange specifics per cartridge type)

ISO 646, ISO 2022, ISO 4873 (character sets and coding)

ECMA‑59, ECMA‑78 (related disk interchange standards)

Keywords: ISO 7665, flexible disk cartridges, file structure, labelling, data interchange, index cylinder, volume label, file label, ERMAP, interchange levels.

ISO 7665:1983

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications - who uses it

Related standards

Технические детали

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