HP Vectra Technical Reference Manual page 333

Table 10.3
Boot Record
Offset
OOOOH
0003H
OOOBH
OOODH
OOOEH
0011H
0012H
0014H
0016H
0017H
0019H
001BH
001DH
001FH
01FEH
Size
3 Bytes
8 Bytes
1 Word
1 Byte
1 Word
1 Byte
1 Word
1 Word
1 Byte
1 Word
1 Word
1 Word
1 Word
478 Bytes
1 Word
Description
Near JUMP instruction to boot code.
OEM name and version number.
Bytes per sector.
Sectors per allocation unit.
Reserved sectors.
Number of File Allocation Tables (FATs).
Number of root directory entries.
Number of sectors in logical image.
Media descriptor.
Number of FAT sectors.
Sectors per track.
Number of heads.
Number of hidden sectors.
Boot code.
55AAH signature word.
The first physical sector (cylinder 0, head 0, sector 1) of the hard disc contains the master boot
record. The master boot record contains a code module and the disc partition table. The disc
partition table contains the starting and ending cylinder of each of the disc partitions, as well as
a flag that indicates whether the partition is active or not. Table
10.4
contains a description of
the master boot record.
Table
10.4
Hard Disc Master Boot Record
Offset
OOOOH
01BEH
01CEH
01DEH
01EEH
01FEH
Size
446 Bytes
16 Bytes
16 Bytes
16 Bytes
16 Bytes
1 Word
Description
Master boot code.
Partition table entry #1.
Partition table entry #2.
Partition table entry #3.
Partition table entry #4.
OAA55H signature word.
324 System Processes