Block diagram
This page hosts a formal specification of GPT (GUID) partition table using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
meta:
id: gpt_partition_table
title: GPT (GUID) partition table
xref:
forensicswiki: gpt
justsolve: GUID_Partition_Table
wikidata: Q603889
license: CC0-1.0
endian: le
doc-ref: https://en.wikipedia.org/wiki/GUID_Partition_Table
instances:
sector_size:
value: 0x200
# Default is 0x200 for 512 byte sectors, set to 0x1000 to parse 4096 byte sectors.
primary:
io: _root._io
pos: _root.sector_size
type: partition_header
backup:
io: _root._io
pos: _io.size - _root.sector_size
type: partition_header
types:
partition_entry:
seq:
- id: type_guid
size: 0x10
- id: guid
size: 0x10
- id: first_lba
type: u8
- id: last_lba
type: u8
- id: attributes
type: u8
- id: name
type: str
encoding: UTF-16LE
size: 0x48
partition_header:
seq:
- id: signature
contents: [0x45, 0x46, 0x49, 0x20, 0x50, 0x41, 0x52, 0x54]
- id: revision
type: u4
- id: header_size
type: u4
- id: crc32_header
type: u4
- id: reserved
type: u4
- id: current_lba
type: u8
- id: backup_lba
type: u8
- id: first_usable_lba
type: u8
- id: last_usable_lba
type: u8
- id: disk_guid
size: 0x10
- id: entries_start
type: u8
- id: entries_count
type: u4
- id: entries_size
type: u4
- id: crc32_array
type: u4
# The document states "Reserved; must be zeroes for the rest of the block".
# It would be pointless to process a data structure that must be zeroed.
instances:
entries:
io: _root._io
pos: entries_start * _root.sector_size
size: entries_size
type: partition_entry
repeat: expr
repeat-expr: entries_count