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                    DBT - Disk Base Table     (BIOS INT 13)

      Offset Size             Description

        00   byte  specify byte 1; step-rate time, head unload time
        01   byte  specify byte 2; head load time, DMA mode
        02   byte  timer ticks to wait before disk motor shutoff
        03   byte  bytes per sector code:

                        0 - 128 bytes   2 - 512 bytes
                        1 - 256 bytes   3 - 1024 bytes

        04   byte  sectors per track (last sector number)
        05   byte  inter-block gap length/gap between sectors
        06   byte  data length, if sector length not specified
        07   byte  gap length between sectors for format
        08   byte  fill byte for formatted sectors
        09   byte  head settle time in milliseconds
        0A   byte  motor startup time in eighths of a second