INT 13 - FLOPPY - FORMAT TRACK
        AH = 05h
        AL = number of sectors to format
        CH = track number
        DH = head number
        DL = drive number
        ES:BX -> address field buffer (see below)
Return: CF set on error
        CF clear if successful
        AH = status (see AH=01h)
Notes:  on AT or higher, call AH=17h first
        the number of sectors per track is read from the diskette parameter
          table pointed at by INT 1E
SeeAlso: AH=05h"FIXED",AH=17h,AH=18h,INT 1E

Format of address field buffer entry (one per sector in track):
Offset  Size    Description
 00h    BYTE    track number
 01h    BYTE    head number (0-based)
 02h    BYTE    sector number
 03h    BYTE    sector size (00h=128 bytes, 01h=256 bytes, 02h=512, 03h=1024)

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