Annex Q (Normative) 90 mm 2.3 GB Magneto-Optical Disk

Q.1 DICOM MAPPING TO MEDIA FORMATS

Only one DICOM File-set shall be stored onto a single 90mm disk.

Q.2 MEDIA FORMATS

The media format comprises two distinct components:

a. The Recording format, which addresses magnetic recording, track definition, sector headers, etc.

b. The Logical format, which addresses the organization of the data portion of sectors to support semantics of the file system.

Q.2.1 Recording Format

The low level formatting shall be done using the GIGAMO standard. GIGAMO is published as a Sony-Fujitsu document and is currently not an ISO/IEC standard. The document specifying this formatting is the "GIGAMO 2.3GB 90mm Magneto-optical Disk System in Cherry Book2 version 1.0". The Secondary Defect List shall be used.

Q.2.2 Logical Format

The Logical Format for the 90mm 2.3GB disk shall be the PC File System (Annex A).

The boot sector defined in Annex A shall have the following values.

Table Q.2-1

BOOT PARAMETER VALUES FOR 90mm 2.3 GB MAGNETO-OPTICAL DISK

Byte(s) Value Description
11 - 12 0800H 2048 Bytes/Sector
13 08H, 10H, 20H, or 40H Sectors / cluster, either 8, 16, 32, or 64
21 F8H Flag for disk type F8H = Hard Disk
24-25 0019H (Nominal) Nominally 25 sectors/track, but may vary, and any value should not affect interoperability
26-27 0001 (Nominal) Nominally 1 head, but may vary, and any value should not affect interoperability.

Note: When formatted the total formatted capacity of the disk is approximately 2.02GB.

Q.3 PHYSICAL MEDIA

The physical media shall be the 90mm Magneto-Optical Rewritable disk with 2048 bytes per sector. It shall be compatible with the R/W Type cartridge defined in the "GIGAMO 2.3GB 90mm Magneto-optical Disk System in Cherry Book2 version 1.0".