Int 21 Fn 4404  - Dblspace.bin V6.2 - Ioctl - Get ??? For Specified Drive  [k]

   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 #1220)

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 #1366 at AH=59h/BX=0000h)

See Also: AX=4405h"DBLSPACE",INT 2F/AX=4A11h/BX=0000h

Format of DoubleSpace DSPACKET structure:
Offset Size    Description (Table 1220)
 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