Partitioning system for Sun Sparc machines
==========================================

Infos extracted from [File System Forensic Analysis, Brian Carrier](urn:isbn:0-134-43954-6)
and in particular the [online copy here](https://books.google.fr/books?id=Zpm9CgAAQBAJ&lpg=PT159&ots=6LIQ6blJCF&dq=solaris%20vtoc%20structure&hl=fr&pg=PT159#v=onepage&q=solaris%20vtoc%20structure&f=false), tables 6.9 and 6.10.

The format is called VTOC (volume table of contents). It is stored at offset 0
on-disk. All values are big endian.

Note that the x86 version of Solaris uses a different layout.

Byte offset|Description
0-127      |ASCII disk label
128-261    |VTOC *
262-263    |Sectors to skip when writing
264-265    |Setors to skip when reading
266-419    |Reserved
420-421    |Disk speed
422-423    |Number of cylinders
424-425    |Alternates per cylinder
426-429    |Reserved
430-431    |Interleave
432-433    |Number of data cylinders
434-435    |Number of alternate cylinders
436-437    |Number of heads
438-439    |Number of sectors per track
440-443    |Reserved
444-451    |Partition 1 disk map
...        |More partition disk maps
500-507    |Partition 8 disk map
508-509    |Signature (0xDABE)
510-511    |Checksum

The VTOC itself:

0-3   Version
4-11  Volume name
12-13 Number of partitions
14-15 Partition 1 type
16-17 Partition 1 flags
...   More partition types and flags
42-45 Partition 8 type and flags
46-57 Boot info
58-59 Reserved
60-63 Signature 0x600DDEEE
64-101 Reserved
102-105 Partition 1 timestamp
...     More partition timestamps
130-133 Parittion 8 timestamp

Partition types (informative):

0 unassigned
1 /boot
2 /
3 swap
4 /usr
5 entire disk
6 /stand
7 /var
8 /home
9 alternate sector
10 cachefs

Partition flags:
1 Not mountable
128 read only

Disk maps:

0-3 Starting cylinder
4-7 Size (in sectors)