Compatibility: 4.0 only  Undoc 

Expects: AX    440dH

BX    drive (0=default, 1=A, 2=B, etc.)

CL    67H

CH    08H (device category: block device)

DS:DX addr of a 16-bit buffer to receive information

Returns: AX    error code  if CF is set to CY

DS:DX buffer contains returned data:

DS:[DX+0]  always 0

DS:[DX+1]  00H=drive is NOT locked

01H=drive is locked; access is denied

Info: Obtains the current setting of the disk access flag.  The driver

may disable all disk access, for instance, when it detects

unformatted media or an invalid boot record.

Note: This function is not documented in official MS-DOS references.

See Also: Fn 44H (IOCTL)

Fn 440dH (generic IOCTL for block devices)

Fn 440dH 47H (set access flag)

Generic IOCTL Data Packets

DOS Functions

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