DOS Fn 32H: Get DPB (Drive Parameter Block)

                                                         Compatibility: 2.0+ 
 Expects: AH    32H
          DL    drive number (0=default, 1=A, etc.)
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 Returns: AL    0    if DL was a valid drive
                0ffH if invalid drive
          DS:BX address of Drive Parameter Block (DPB) for requested drive
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    Info: Returns a block of information that is useful for utilities which
          perform sector-level access of disk drives supported by device
          drivers.

          Some disk drives (especially non-bootable drives) work via their
          device driver interface only.  These drives might not contain
          valid information in the Boot Sector and Partition Table, making
          it very hard to locate, for instance, the size of the root
          directory or the number of FATs, etc.  The DPBRec contains all
          this information in a nicely-formatted structure.

          This may be the only way to find the address of a device driver.

 Warning: ■ Alters the value of the DS segment register.

See Also: Fn 1fH (get DPB, default disk)
          Drive Parameter Block
          INT 25H/26H (absolute disk I/O)
          Disk Drive Functions
          DOS Functions
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