Open Computers
Partition Table Format

All machines are assumed to be little-endian.
Expected sector size: 512 bytes.
Using the standard OCPT EEPROM and OCPT PARTED floppy, partition 1 is assumed to be 20 sectors (10 KiB) in size and is reserved for the bootloader.

Sector 0: OCPT header
Sector 1: Entry 1 | Entry 2 | Entry 3 | Entry 4
Sector 2: Entry 5 | Entry 6 | Entry 7 | Entry 8
Sector 3: Entry 9 | Entry 10 | Entry 11 | Entry 12
Sector 4: Entry 13 | Entry 14 | Entry 15 | Entry 16
Sector 5+: Partition 1...

OCPT Header (size: 60 bytes)
Off | Length   | Contents
----|----------|---------
0   | 4 bytes  | Signature ("OCPT" 4F 43 50 54)
4   | 36 bytes | Disk UUID (same as address of disk)
40  | 4 bytes  | Header sector
44  | 4 bytes  | First entry sector
48  | 4 bytes  | Last entry sector
52  | 4 bytes  | First partition sector
56  | 4 bytes  | Last partition sector
60  | 4 bytes  | Number of partitions
64  | *        | Reserved (until end of sector)

Entry Header (size: 128 bytes)
Off | Length   | Contents
----|----------|---------
0   | 36 bytes | Partition UUID
36  | 4 bytes  | First sector
40  | 4 bytes  | Last sector (inclusive)
44  | 4 bytes  | Partition type
48  | 4 bytes  | Attribute flags
52  | 76 bytes | Partition name (utf-8)

Partition Types
Type | Content
-----|--------
TODO | TODO

Partition Attributes
Bit | Content
----|--------
0   | Read-only
1   | Hidden
2   | Bootable

Whether or not any partition attributes are respected depend on the EEPROM.