en:docs:bios:api:int13:00235

Format of floppy format 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)