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Copyright 1991 David Jurgens |
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
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BIOS Parameter Block |
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