All values are decimal unless otherwise stated. Akai hard disks and CD-ROMs use the same file format as Akai floppy disks, and virtually the same disk format. For example, if a file starts at block 5, map entry 5 may contain the value 6, indicating that the next block to read is block 6. The next block to read is then given by map entry 6. The map entry for the last block of a file contains the value 32768.
Unused blocks have a map entry of zero.
The first 4 blocks are needed for the file entries and map. The second byte contains the upper 8 bits of the first word. Empty entries also have the S1000 ID byte. Note that the S01 uses the S1000 format for disks and samples, but with an ID of 1,0 for high density and 0,1 for low-density unused entries. The sample data follows the header as signed 16-bit words.