INT 21,1B - Get Allocation Table Information

AH = 1B

on return:

AL = sectors per cluster

CX = bytes per sector

DX = clusters on disk

DS:BX = pointer to ~Media Descriptor Byte~ found in ~FAT~

- retrieves information on capacity and format of default drive

- DS:BX can be used to determine if drive is RAMDISK or removable

- see ~INT 21,1C~