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X-Hacker.org- Programmers Reference 0.02b - <b>function 440fh (68-15) ioctl: set logical drive . dos 3.2</b>
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Function 440Fh (68-15) IOCTL: Set Logical Drive . DOS 3.2
Sets the drive letter used most recently to refer to a device that has
more than one drive letter.
On entry: AH 44h
AL 0Fh
BL Drive number (0=default, 1=A, etc.)
Returns: AL 00h of only one letter is assigned to the
block device
Highest letter assigned to block device
(1 = A, 2 = B, etc.)
AX Error code if CF is set
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Some block devices use more than one drive letter to refer to the same
device. For example, the floppy disk drive on a system with only one
floppy disk drive can be referred to as either A: or B:. This
function sets the drive letter used most recently to refer to a drive.
Notes: Function 440Eh can be used to get the most recent
drive letter used to refer to a device.
If you issue an I/O operation using a drive letter
other than the most recently used drive letter, DOS
will issue a message "Insert diskette for...". You
can avoid this message by changing the current drive
letter before issuing any I/O function calls.
See Also: 44h 440Eh
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