Bitfields for flags describing drive:
Bit(s) Description )
0 fixed media
1 door lock ("changeline") supported
2 current BPB locked
3 all sectors in a track are the same size
4 physical drive has multiple logical units
5 current logical drive for shared physical drive
6 disk change detected
7 device parameters were changed (set DASD before formatting)
(see #01560 at INT 21/AX=440Dh"DOS 3.2+")
8 disk reformatted (BPB of current media was changed)
9 access flag (fixed media only, disables reads and writes)
(see #01566 at INT 21/AX=440Dh"DOS 3.2+")