Guid Partition Table Header - Intel Extensible Firmware Interface Specification

Intel extensible firmware interface specification
Table of Contents

Advertisement

Table 16-1. GUID Partition Table Header
Mnemonic
Signature
Revision
HeaderSize
HeaderCRC32
Reserved
MyLBA
AlternateLBA
FirstUsableLBA
LastUsableLBA
DiskGUID
PartitionEntryLBA
NumberOfPartitionEntries
SizeOfPartitionEntry
PartitionEntryArrayCRC32
Reserved
The following test must be performed to determine if a GUID Partition Table is valid:
Check the GUID Partition Table Signature
Check the GUID Partition Table CRC
Check that the MyLBA entry points to the LBA that contains the GUID Partition Table
Check the CRC of the GUID Partition Entry Array
Version 1.02
Byte
Byte
Offset
Length
Description
0
8
Identifies EFI-compatible partition table header.
This value must contain the string "EFI PART",
0x5452415020494645.
8
4
The specification revision number that this header
complies to. For version 1.0 of the specification
the correct value is 0x00010000.
12
4
Size in bytes of the GUID Partition Table Header.
16
4
CRC32 checksum for the GUID Partition Table
Header structure. The ranged defined by
HeaderSize is "check-summed".
20
4
Must be zero.
24
8
The LBA that contains this data structure.
32
8
LBA address of the alternate GUID Partition Table
Header.
40
8
The first usable logical block that may be
contained in a GUID Partition Entry.
48
8
The last usable logical block that may be
contained in a GUID Partition Entry.
56
16
GUID that can be used to uniquely identify the
disk.
72
8
The starting LBA of the GUID Partition Entry array.
80
4
The number of Partition Entries in the GUID
Partition Entry array.
84
4
The size, in bytes, of each the GUID Partition
Entry structures in the GUID Partition Entry array.
Must be a multiple of 8.
88
4
The CRC32 of the GUID Partition Entry array.
Starts at Partition Entry LBA and is
NumberOfPartitionEntries * SizeOfPartitionEntry in
byte length.
92
BlockSize
The rest of the block is reserved by EFI and must
– 92
be zero.
12/12/00
File System Format
311

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the Extensible Firmware Interface and is the answer not in the manual?

Table of Contents