Int 13h, 11h            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.

        Entry   AH = 11h
                DL = Drive number (Bit 7 must be set)

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

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    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.