IEC 62345:2005

Overview

IEC 62345:2005 - ID format for 50 mm magneto‑optical disc system defines the logical and identification (ID) formats for removable 50 mm magneto‑optical Optical Disc Cartridges (ODC) used in digital still cameras, digital movie cameras, electronic albums and similar devices. The standard supports cartridges with a capacity of 730 Mbytes per cartridge and specifies recording, reproducing and processing methods for still images, motion pictures and audio to ensure cross‑device interoperability and reliable data exchange.

Key Topics and Technical Requirements

The standard covers both physical and logical aspects required for compatible magneto‑optical systems:

• General description & reference drive: optical system, beam, read channels, tracking and rotation behavior required for a compliant drive.
• Mechanical & physical characteristics: cartridge and disc dimensions, shutter mechanisms, interface and flatness/curvature test methods.
• Track, frame and sector formats: track geometry, address/data segments, wobble/groove signals and fine clock marks.
• Data integrity and coding: ECC block format, error correction, NRZI‑plus convolution recording code and interleave schemes.
• Data zone & defect management: logical zone structure, Data Management Areas, defect lists and handling strategies.
• Recording layer & embossed information: magneto‑optical recording properties, signal shapes and measurement methods.
• File system and multimedia file formats: volume and file structures for images, audio and movies; informative annexes reference Exif, DCF (Design Rule for Camera File System) and QuickTime movie formats.
• Test methods & normative annexes: air cleanliness, mechanical testing, friction, measurement methods and formatting flows for data units.

Applications and Who Uses It

IEC 62345 is intended for organizations involved in design, manufacturing, testing and integration of magneto‑optical storage solutions:

• Camera and camcorder manufacturers implementing removable 50 mm ODCs.
• Optical drive and cartridge hardware designers.
• Firmware and file‑system developers ensuring cross‑device compatibility.
• Test laboratories and certification bodies validating mechanical, optical and logical compliance.
• Archive and media workflow integrators that require predictable file formats and defect management for long‑term storage.

Related Standards and References

• IEC 62346 (related cartridge characteristics referenced in the scope)
• Exif (image metadata) - Annex K (informative)
• DCF (Design Rule for Camera File System) - Annex L (informative)
• QuickTime movie file format - Annex M (informative)
• UDF/OSTA descriptors and other file system identifiers referenced in the standard

Keywords: IEC 62345, 50 mm magneto‑optical disc, Optical Disc Cartridge, ID format, ECC, NRZI, defect management, Exif, DCF, QuickTime, optical drive standards, interoperability.