Int 13 Fn 11  - Hard Disk - Recalibrate Drive                              [B]

   AH = 11h
   DL = drive number (80h = first, 81h = second hard disk)

Return: CF set on error
   CF clear if successful
   AH = status (see AH=01h)

Note:  causes hard disk controller to seek the specified drive to cylinder 0

See Also: AH=00h,AH=0Ch,AH=19h"FIXED DISK"