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Bitfields for flags describing drive

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Bit 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+")