Int 21 Fn 32  - DOS 2+ - Get Dos Drive Parameter Block For Specific Drive  [D]

   AH = 32h
   DL = drive number (00h = default, 01h = A:, etc)

Return: AL = status
       00h successful
       DS:BX -> Drive Parameter Block (DPB) for specified drive
       FFh invalid or network drive

Notes: the OS/2 compatibility box supports the DOS 3.3 version of this call
     except for the DWORD at offset 12h
   this call updates the DPB by reading the disk; the DPB may be accessed
     via the DOS list of lists (see AH=52h) if disk access is not
     desirable.
   undocumented prior to the release of DOS 5.0; only the DOS 4+ version
     of the DPB has been documented, however
   supported by DR-DOS 3.41+; DR-DOS 3.41-6.0 return the same data as
     MS-DOS 3.31

See Also: AH=1Fh,AH=52h

Format of DOS Drive Parameter Block:
Offset Size    Description
 00h   BYTE    drive number (00h = A:, 01h = B:, etc)
 01h   BYTE    unit number within device driver
 02h   WORD    bytes per sector
 04h   BYTE    highest sector number within a cluster
 05h   BYTE    shift count to convert clusters into sectors
 06h   WORD    number of reserved sectors at beginning of drive
 08h   BYTE    number of FATs
 09h   WORD    number of root directory entries
 0Bh   WORD    number of first sector containing user data
 0Dh   WORD    highest cluster number (number of data clusters + 1)
       16-bit FAT if greater than 0FF6h, else 12-bit FAT
 0Fh   BYTE    number of sectors per FAT
 10h   WORD    sector number of first directory sector
 12h   DWORD   address of device driver header
 16h   BYTE    media ID byte
 17h   BYTE    00h if disk accessed, FFh if not
 18h   DWORD   pointer to next DPB
---DOS 2.x---
 1Ch   WORD    cluster containing start of current directory, 0000h=root,
       FFFFh = unknown
 1Eh 64 BYTEs  ASCIZ pathname of current directory for drive
---DOS 3.x---
 1Ch   WORD    cluster at which to start search for free space when writing
 1Eh   WORD    number of free clusters on drive, FFFFh = unknown
---DOS 4.0-6.0---
 0Fh   WORD    number of sectors per FAT
 11h   WORD    sector number of first directory sector
 13h   DWORD   address of device driver header
 17h   BYTE    media ID byte
 18h   BYTE    00h if disk accessed, FFh if not
 19h   DWORD   pointer to next DPB
 1Dh   WORD    cluster at which to start search for free space when writing,
       usually the last cluster allocated
 1Fh   WORD    number of free clusters on drive, FFFFh = unknown