Make your own free website on Tripod.com
Up ] Docs Home ]

Bitfields for device attributes (block device)

Back ] Next ]

Bit Description

15

clear (indicates block device)

14

IOCTL supported

13

non-IBM format

12

network device (device is remote)

11

(DOS 3.0+) OPEN/CLOSE/RemMedia calls supported

10

reserved

9

direct I/O not allowed??? (set by DOS 3.3 DRIVER.SYS for "new" drives)

8

??? set by DOS 3.3 DRIVER.SYS for "new" drives

7

(DOS 5.0+) Generic IOCTL check call supported (driver command 19h) (see AX=4410h,AX=4411h)

6

(DOS 3.2+) Generic IOCTL call supported (driver command 13h) implies support for commands 17h and 18h (see AX=440Ch,AX=440Dh"DOS 3.2+",AX=440Eh,AX=440Fh)

5 - 2

reserved

1

driver supports 32-bit sector addressing (DOS 3.31+)

0

reserved

Note:

For European MS-DOS 4.0, bit 11 also indicates that bits 8-6 contain a version code (000 = DOS 3.0,3.1; 001 = DOS 3.2; 010 = European DOS 4.0).

See Also:

01647,#01646