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AX = 440Eh BL = drive number (00h=default,01h=A:,etc)
Return:
CF set on error AX = error code (01h,0Fh) (see #01680 at AH=59h/BX=0000h) CF clear if successful AL = 00h block device has only one logical drive assigned 1..26 the last letter used to reference the drive (1=A:,etc)
Notes: DR DOS 3.41-5.0 DRIVER.SYS does not support drive mapping and thus always returns AL=00h; Windows NT 4.0 also always returns AL=00h. In addition to the normal operation, if Stacker is installed, this call also sets the volume number at offset 58h in the Stacker device driver (DR DOS 3.41-5.0 only; use AX=4408h otherwise) (see AX=4404h"Stacker",INT 25/AX=CDCDh)
See Also: AX=4408h - AX=440Fh - INT 2F/AX=122Bh
Category: DOS Kernel - Int 21h - D
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