INT 13,7 - Format Drive Starting at Specified Track (XT & portable)

AH = 07

AL = interleave value (XT only)

BX = format buffer, size = 512 bytes; the first 2*(sectors/track)

bytes contain F, N for each sector where:

F = 00h for good sector

F = 80h for bad sector

N = sector number

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

- only the disk number is checked for validity