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Copyright 1991 David Jurgens |
INT 21,32 - Get Pointer to Drive Parameter Table (Undocumented)
AH = 32h
DL = drive (0=default, 1=A:, 2=B:, 3=C:, ...)
on return:
AL = FF if the drive number in DL was invalid
DS:BX = address of drive parameter table (DPT)
- available since DOS 2.0
- used by DOS commands CHKDSK and RECOVER
- forces a media check, which clears byte DS:[BX+17h] or DS:[BX+18h]
in the Drive Parameter Table
- actually accesses the disk, causing a critical error if a disk
error occurs
- can be used to determine if a drive is SUBST'ed by comparing
DS:[BX+1] and DS:[BX] for a match. If not equal, then the
drive is possibly SUBST'ed (though not guaranteed, this may also
indicate a Bernoulli box)
- can be used to determine if a drive is a RAM disk; if the disk is
NOT removable and (DS:[BX+1] == 0), then the disk is a RAM disk
(see IOCTL,0 bit number 0Bh to determine if the disk is removable)
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| Esc or Alt-X to exit |
int 21,32 |
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