Master boot record
Sector layout
By convention, there are exactly four primary partition table entries in the MBR partition table scheme, although some operating systems and system tools extended this to five (Advanced Active Partitions (AAP) with PTS-DOS 6.60 and DR-DOS 7.07), eight (AST and NEC MS-DOS 3.x as well as Storage Dimensions SpeedStor), or even sixteen entries (with Ontrack Disk Manager).

Master boot record

Section Title: Sector layout
Table Section Text: By convention, there are exactly four primary partition table entries in the MBR partition table scheme, although some operating systems and system tools extended this to five (Advanced Active Partitions (AAP) with PTS-DOS 6.60 and DR-DOS 7.07), eight (AST and NEC MS-DOS 3.x as well as Storage Dimensions SpeedStor), or even sixteen entries (with Ontrack Disk Manager).

Address	Description	Size (bytes)

Hex	Dec

+000hex	+0	Bootstrap code area	446

+1BEhex	+446	Partition entry №1	Partition table (for primary partitions)	16

+1CEhex	+462	Partition entry №2	16

+1DEhex	+478	Partition entry №3	16

+1EEhex	+494	Partition entry №4	16

+1FEhex	+510	55hex	Boot signature	2

+1FFhex	+511	AAhex

Total size: 446 + 4×16 + 2	512

Sentence(s)

The Master boot sector size was 512 bytes.

final_sentence: The Master boot sector size was 512 bytes.