Int 13 Fn 0D  - Hard Disk - Reset Hard Disks                               [B]

   AH = 0Dh
   DL = drive number (80h = first, 81h = second hard disk)

Return: CF set on error
   CF clear if successful
   AH = status (see #0166)

Notes: reinitializes the hard disk controller, resets the specified drive's
     parameters, and recalibrates the drive's heads (seek to track 0)
   for PS/2 35SX, 35LS, 40SX and L40SX, as well as many other systems,
     both the master drive and the slave drive respond to the Reset
     function that is issued to either drive
   not for PS/2 ESDI drives

See Also: AH=00h,INT 21/AH=0Dh