◄Summary► ◄Up► ◄Contents► ◄Index► ◄Back► ──────────────────────────────────────────────────────────────────────────── This function is supported on fixed disks only. For PC and PC/XT fixed disks, the parameter block format is as follows: Bytes Contents 00h-01h Maximum number of cylinders 02h Maximum number of heads 03h-04h Starting reduced write current cylinder 05h-06h Starting write precompensation cylinder 07h Maximum ECC burst length 08h Drive options Bit 7 = 1 to disable disk-access retries Bit 6 = 1 to disable ECC retries Bits 3-5 = 0 Bits 0-2 = Drive option 09h Standard time-out value 0Ah Time-out value for format drive 0Bh Time-out value for check drive 0Ch-0Fh Reserved For PC/AT and PS/2 fixed disks, the parameter block format is as follows: Bytes Contents 00h-01h Maximum number of cylinders 02h Maximum number of heads 03h-04h Reserved 05h-06h Starting write precompensation cylinder 07h Maximum ECC burst length 08h Drive options Bits 6-7 = Nonzero (10, 01, or 11) to disable retries Bit 5 = 1 if manufacturer's defect map present at maximum cylinder + 1 Bit 4 = Not used Bit 3 = 1 if more than 8 heads Bits 0-2 = Not used 09h-0Bh Reserved 0Ch-0Dh Landing zone cylinder 0Eh Sectors per track 0Fh Reserved -♦-