Atari MEGA STe Informações Técnicas descarregar pdf (Página 45)

For the standard partition description, the definitions of the fields in the partition table entry are:

Offset

Length

Description

$00

Flag: indicate the state of the partition

 bit 0 when set partition exist,

 bit 1-7 reserved

$01

Id: a 3-bytes ASCII field that identifies the type of partition

 GEM for regular (< 32MB) partition

 BGM for big (≥ 32MB) partition

$04

Offset to the beginning of the standard partition from the beginning of the extended

root sector that this structure reside in. In number of physical (512 bytes) sectors

$08

Size of the partition in number of physical (512 bytes) sectors

For the link to the next partition, the definitions of the fields in the partition table entry are:

Offset

Length

Description

$00

Flag: indicate the state of the partition

 bit 0 when set partition exist,

 bit 1-7 reserved

$01

Id: a 3-bytes ASCII field that identifies the type of partition

 XGM must be used

$04

Offset to the beginning of the next subdivision from the beginning of the entire

extended partition. In number of physical (512 bytes) sectors

$08

Size of the partition in number of physical (512 bytes) sectors

9.4.2 Example of layout with TOS extended partitions

In the following example we have a hard disk with 3 standard partitions and an extended partition that

contains two standard partitions. The Root Sector contains 3 pointers to the 3 standard partitions and

a pointer to the extended partition that starts with the first Extended Root Sector. This ERS contains

a pointer to a standard partition and a pointer to the next Extended Root Sector. The second ERS

contains only a pointer to the second standard partition as it is the last in the chain.

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 68 69

Sem comentários

Atari MEGA STe Informações Técnicas Página 45