INT 13h,  0Dh (13)       Alternate Disk Reset                      fixed disk

Resets the fixed disk controller and drives, forcing recalibration of
the read/write heads. This service can be performed on fixed disks
only.

On entry:      AH         0Dh
DL         Drive number (Bit 7 must be set)

Returns:       AH         Status of operation (See Service 01h)
CF         Set if error, else cleared

                                                                          

Notes:         See Service 00h for a more generalized version of
this service.

A fixed disk reset is only executed if the value in
DL is less than or equal to the last fixed disk on
the system. That is, the lower 7 bits of DL should
be less than or equal to the number of fixed disks.

For the AT, XT-286, and PC Convertible, the BIOS
executes INT 15h, Service 90h (Device Busy), for the
diskette (Type = 01h) and the fixed disk (Type =
00h) prior to waiting for the interrupt. INT 15h,
Service 91h (Interrupt Complete), is executed upon
completion.

See also: INT 13h, 00h
See also: INT 13h, 01h
See also: INT 13h, 11h

INT 13h, 0Dh (13) Alternate Disk Reset fixed disk