DOS Fn 1cH: Get Drive Info (any disk)

                                                         Compatibility: 2.0+ 
 Expects: AH    1cH
          DL    drive number (0=default, 1=A, etc).
 Returns: DS:BX address of a FAT ID byte (might indicate disk type)
          DX    total clusters (allocation units) on the disk
          AL    sectors per cluster
          CX    bytes per sector
    Info: Returns information on the size and type of the default disk.
          Same as DOS Fn 1bH (get FAT current drive) except that DL
          specifies the drive for which you want the information.

          Disk size in bytes = (DX * AL * CX).

          Find free space with DOS Fn 36h Disk Free or 32h Disk Info.

 Warning: Notice that this changes the value of DS segment register.

Versions: Not documented for DOS 1.x

See Also: Fns 1bH  36H  32H
          File Allocation Table
          DOS Functions