Int 13 Fn 05  - Fixed Disk - Format Track                                  [B]

   AH = 05h
   AL = interleave value (XT-type controllers only)
   ES:BX -> 512-byte format buffer
       the first 2*(sectors/track) bytes contain F,N for each sector
          F = sector type
           00h for good sector
           20h to unassign from alternate location
           40h to assign to alternate location
           80h for bad sector
          N = sector number
   CH = cylinder number (bits 8,9 in high bits of CL)
   CL = high bits of cylinder number (bits 7,6)
   DH = head
   DL = drive

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

Notes: AWARD AT BIOS and AMI 386sx BIOS have been extended to handle more
     than 1024 cylinders by placing bits 10 and 11 of the cylinder number
     into bits 6 and 7 of DH
   for XT-type controllers on an AT or higher, AH=0Fh should be called
     first
   the IBM AT BIOS and many other BIOSes use only the low four bits of
     DH (head number) since the WD-1003 controller which is the standard
     AT controller (and the controller that IDE emulates) only supports
     16 heads
   not all controller support sector types 20h and 40h
   under Windows95, an application must issue a physical volume lock on
     the drive via INT 21/AX=440Dh before it can successfully write to
     the disk with this function

See Also: AH=05h"FLOPPY",AH=06h"FIXED",AH=07h"FIXED",AH=0Fh,AH=18h,AH=1Ah