The Private Header (PRIVHEAD) structure is 512 bytes long and there
are three copies on each physical disk. The first is located just
after the partition table. The second is near the end of the LDM
database. The third makes up the last 512 bytes of the physical disk.
| Offset |
Size |
Description |
| 0x00 |
8 |
PRIVHEAD Magic number |
| 0x08 |
4 |
Checksum (a) |
| 0x0C |
2 |
Major Version Number (see below) |
| 0x0E |
2 |
Minor Version Number (see below) |
| 0x10 |
8 |
Timestamp of Last Update (FileTime UTC) |
| 0x18 |
8 |
Update Sequence Number (b) |
| 0x20 |
8 |
Primary Private Header LBA (relative to Private Region Start) |
| 0x28 |
8 |
Secondary Private Header LBA (relative to Private Region Start) |
| 0x30 |
64 |
Disk GUID (string, null padded) |
| 0x70 |
64 |
Host GUID (string, null padded) |
| 0xB0 |
64 |
Disk Group GUID (string, null padded) |
| 0xF0 |
31 |
Disk Group Name (string, null padded) |
| 0x10F |
4 |
Bytes Per Block (a.k.a. Sector) |
| 0x113 |
4 |
Private Header Flags (see below) |
| 0x117 |
2 |
Public Region Slice Number |
| 0x119 |
2 |
Private Region Slice Number |
| 0x11B |
8 |
Public Region Start LBA |
| 0x123 |
8 |
Public Region Size LBA |
| 0x12B |
8 |
Private Region Start LBA |
| 0x133 |
8 |
Private Region Size LBA |
| 0x13B |
8 |
Primary TOC LBA (relative to Private Region Start) |
| 0x143 |
8 |
Secondary TOC LBA (relative to Private Region Start) |
| 0x14B |
4 |
Number of Configs |
| 0x14F |
4 |
Number of Logs |
| 0x153 |
8 |
Size of Config |
| 0x15B |
8 |
Size of Log |
| 0x163 |
4 |
Disk Signature (or zero) |
| 0x167 |
16 |
Disk Set GUID (hex) |
| 0x177 |
16 |
Disk Set GUID repeat (hex) |
(a) Sum of all the bytes in the sector excluding the 4 bytes of the checksum field
(b) Kept in sync with UpdateSequenceNumber of the most recent TOCBlock.