Atari MEGA STe Informações Técnicas descarregar pdf (Página 53)

10.4.1 Example of layout with DOS/FAT standard partitions

In the following example we have a hard disk with 3 primary partitions. The Master Boot Record

contains 3 pointers to the 3 partitions. These partitions can be either regular or big partitions.

10.5 DOS/FAT Extended Partition

An extended partition is a special partition which contains secondary partition(s). A hard disk may

contain only one extended partition; which can then be sub-divided into many logical drives.

10.5.1 Extended Master Boot Record (EMBR)

The first sector of the Extended Partition contains an Extended Master Boot Record (EMBR). It is

very similar to the Master Boot Record.

The Extended Master Boot Record contains the following information:

Offset

Length

Description

$0000

455

Normally unused and filled with 0.

$01BE

Partition Table's First entry

$01CE

Partition Table's Second entry

$01DE

Unused, should be filled with zero-bytes

$01FE

MBR Signature $AA55 in little-endian format

Where a Partition Table entry contains:

Offset

Length

Description

Locations

0x00

Status (0x80 = bootable (active), 0x00 = non-bootable)

$1BE, $1CE, $1DE, $1EE

0x01

CHS address of first sector in partition (next 3 bytes):

$1BF, $1CF, $1DF, $1EF

0x01

 Head

0x02

 Sector is in bits 5–0; bits 9–8 of Cylinder are in bits 7–6

0x03

 bits 7–0 of Cylinder

0x04

partition type

$1C2, $1D2, $1E2, $1F2

0x05

CHS address of last sector in partition (next 3 bytes):

$1C3, $1D3, $1E3, $1F3

0x05

 Head

0x06

 Sector is in bits 5–0; bits 9–8 of Cylinder are in bits 7–6

0x07

 bits 7–0 of Cylinder

0x08

LBA of first sector in the partition, in little-endian format

$1C6, $1D6, $1E6, $1F6

0x0C

number of sectors in partition, in little-endian format

$1CA, $1DA, $1EA, $1FA

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 68 69

Comentários a estes Manuais

Sem comentários

Atari MEGA STe Informações Técnicas Página 53

Comentários a estes Manuais

Manuais e produtos relacionados com Barebones PC/estação de trabalho Atari MEGA STe