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                         BPB - BIOS Parameter Block

      Offset Size         Description

        00   word       sector size in bytes
        02   byte       sectors per cluster (allocation unit size)
        03   word       number of reserved sectors
        05   byte       number of FATs on disk
        06   word       number of root directory entries (directory size)
        08   word       number of total sectors; if partition > 32Mb then set
                        to zero and dword at 15h contains the actual count
        0A   byte       media descriptor byte  (see MEDIA DESCRIPTOR)
        0B   word       sectors per FAT

      Additional/different fields for DOS 3.0+
        0D   word       sectors per track
        0F   word       number of heads
        11   word       number of hidden sectors
        15 11bytes      reserved

      Additional/different fields for DOS 4.0+
        15   dword      number of total sectors if offset 8 is zero
        19  6bytes      reserved
        1F   word       number of cylinders
        21   byte       device type
        22   word       device attributes

        - located in the boot sector at offset 0Bh

        - see   BOOT SECTOR