Int 21/AX=4404h

DBLSPACE.BIN v6.2 - IOCTL - GET ??? FOR SPECIFIED DRIVE

AX = 4404h
BL = drive number (00h = default, 01h = A:, etc)
CX = size of DSPACKET structure (ignored in DOS 6.2)
DS:DX -> DSPACKET structure (see #01533)

Return:
CF clear if IOCTL successful -- check DSPACKET for actual status
AX = number of bytes actually transferred
CF set on error
AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)


Format of DoubleSpace DSPACKET structure:

Offset  Size    Description     (Table 01533)
00h    WORD    signature 444Dh ("DM")
02h    BYTE    command code
53h ('S') get ??? for specified drive
03h    WORD    result code
(ret) 4F4Bh ("OK") if successful, else unchanged
05h    DWORD   (ret) pointer to 96-byte ??? data
09h    DWORD   (ret) pointer to ??? data
0Dh  3 BYTEs   reserved

Category: File/Disk Compression - Int 21h - D

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