Overview
ISO/IEC 14863:1996 - Information technology - System‑Independent Data Format (SIDF) specifies a logical, system‑independent format for information interchange and secondary data storage. The standard defines how primary file system information (data, attributes, characteristics) is organized on target media and the requirements for both originating and receiving systems to ensure reliable interchange of file sets and volume sets.
Key topics and technical requirements
- Format scope: Organization of information on media, field and structure definitions, and conformance requirements for media volumes and systems.
- Field and Field Identifier (FID): Data is grouped into named Fields; each Field is uniquely identified by a byte sequence (FID). Field Tables group related Fields and are normatively defined in annexes.
- Recording conventions: Byte/bit order and numeric representation are specified - e.g., the standard records the least significant byte first and gives explicit bit recording rules for each byte. Negative values use two’s complement.
- Character sets (CHAR SPEC): Character encoding defaults to the CS4 character set (IRV of ISO/IEC 646) unless another CHAR SPEC is specified. The standard accommodates multiple character set types and provides mechanism to specify them.
- Timestamps and precision: Standardized timestamp fields (year, month, day, hour, minute, second, centiseconds, microseconds, etc.) are defined for consistent time metadata.
- Media and file organization: Defines Sectors, Buffers, Files, File Sets, Volume and Volume Sets, sector numbering, interleaving and spanning of file sets across volumes.
- Integrity checks: Use of Cyclic Redundancy Check (CRC) for data integrity and detailed recording rules for CRC bits.
- Structure description schema: A formal grammar for describing structures, repetition operators and nesting used throughout the standard.
- Conformance levels: Rules for conformance of media volumes, originating systems, and receiving systems; requirements for access, recording and handling.
Practical applications and users
ISO/IEC 14863 (SIDF) is useful for:
- System integrators and software vendors building cross‑platform file interchange and archival tools.
- Backup, archival and digital preservation solutions that need a stable, system‑independent representation of file systems.
- Hardware and media vendors (optical, removable media) that must support standardized volume and file structures.
- Enterprises and government archives requiring long‑term, platform‑agnostic secondary storage formats.
- Developers implementing tools to convert or migrate file system data between heterogeneous environments.
Related standards
ISO/IEC 14863 references and is intended to work alongside other standards such as:
Keywords: ISO/IEC 14863, SIDF, System-Independent Data Format, data interchange, secondary storage, file set, volume set, Field Identifier, CHAR SPEC, CRC, ISO/IEC standards.