Function 05h	Format Track - write sector ID bytes for 1 track
entry   AH      05h 
	AL      number of sectors to create on this track 
	CH      track (or cylinder) number 
	CL      sector number 
	DH      head number (0, 1) 
	DL      drive number (0-3) 
	ES:BX   pointer to 4-byte address field (C-H-R-N) 
		byte 1 = (C) cylinder or track 
		byte 2 = (H) head 
		byte 3 = (R) sector 
		byte 4 = (N) bytes/sector (0 = 128, 1 = 256, 2 = 512, 3 = 1024) 
return  CF      set if error occurred 
		AH      status code (see above) 
note    Not valid for ESDI hard disks on PS/2