D: Example CP/M and DOS disc structures

Below are examples of sorne of the disc formats that may be encountered. Although this information is intended to be reliable the format and layout of any alien disc should be very carefully before details of its structure are used.

Refer to Chapter Nine for further information on the internals of disc structures. Remember that the number and position of FAT sectors and the root directory may vary from disc to disc. For DOS formats the relevant information should be contained at the beginning of sector zero.

DOS terminology is used here, though it should be noted that many of these formats are CP/M rather than DOS.

Acorn DOS boot disc (DISK 1)

Acorn 512 DOS Plus

Acorn Z80

Archimedes MS DOS 800K

Almarc Spirit 16

Altos 586

Gemini CP/M

IBM PC CP/M-86 single sided

IBM PC CP/M86 double sided

IBM PCDOS 160Kb

IBM PCDOS 180 Kb

IBMPCDOS 320 Kb

IBM PCDOS 360Kb

ICL PC CP/M

Motorola VME/10 CP/M-86

Nokia PC MS DOS format

OTRONA Attache

Proteus

Philips PG9000 GEMDOS

RML Nimbus MS DOS format

Tandy model 2000 MS DOS