INT 13,5 - Format Disk Track

AH = 05

AL = interleave value (XT only)

CX = track/cylinder number (see below for format)

DH = head number (0-15 dec.)

DL = drive number (0=A:, 1=2nd floppy, 80h=drive 0, 81h=drive 1)

ES:BX = pointer to block of "track address fields" containing

four byte fields for each sector to be formatted of the form:

1 byte track number

1 byte head number Size #

1 byte sector number Codes Bytes

1 byte sector size code 0 128

1 256

2 512

3 1024

on return:

AH = status (see ~INT 13,STATUS~)

CF = 0 if successful

= 1 if error

- BIOS disk write attempts should reset the controller on error

- ~INT 13,17~ should be called to set the DASD type

- this function is capable of doing great damage if the parameters

are incorrectly specified; only the drive number is checked

- initializes disk address fields and data sectors

- interleave is specified by ordering of track address fields

- after INT 13 disk format, if the disk is to be used with DOS the

DOS data structure must be written

- only the disk number is checked for validity

- the parameters in CX change depending on the number of cylinders;

the track/cylinder number is a 10 bit value taken from the 2 high

order bits of CL and the 8 bits in CH (low order 8 bits of track):

¦F¦E¦D¦C¦B¦A¦9¦8¦7¦6¦5-0¦ CX (cylinder value 0-1023 dec.)

¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +----- unused

¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +--------- high order 2 bits of track/cylinder

+------------------------ low order 8 bits of track/cyl number