INT 13h,  11h (17)       Recalibrate Drive                         fixed disk

    This service recalibrates a specified fixed disk drive to reset the
    seek speed. This service can be performed on fixed disks only.

       On entry:      AH         11h
                      DL         Drive number (Bit 7 must be set)

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

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       Notes:         This service is called by both Service 00h and
                      Service 0Dh. Thus calling either of these services
                      will accomplish the same as calling Service 11h.

                      This service sends the RECALIBRATE command to the
                      disk controller, making the controller default to
                      its original state and place the read/write arm at
                      track 0.

                      If an error is encountered, use Service 0h to reset
                      the drive and retry the operation.

                      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.