What should I choose for my 7th OS?

[chrisname]

I have designed a partition table to use allowing me to have seven operating systems, with large amounts of disk space for each.

However, I only know of 6 that I want. I would use OpenSolaris for the seventh but it doesn't support extended partitions.

I have the following partition table layout:

Disk size: 596 GiB (640 GB)

+-------------+------------+------------+-----------+
| Partition # | Filesystem | Size (GiB) | Size (GB) |
+-------------+------------+------------+-----------+
| 1           | NTFS       | 400        | 430       |
+-------------+------------+------------+-----------+
| 2           | Extended   | 106        | 114       |
+-------------+------------+------------+-----------+
| 3           | FreeBSD    | 50         | 54        |
+-------------+------------+------------+-----------+
| 4           | ???        | 40         | 42        |
+-------------+------------+------------+-----------+

The extended partition will be layed out thus:

+---------------------+------------+----------------+------------+-----------+
| Logical Partition # | Filesystem | Mount point    | Size (GiB) | Size (GB) |
+---------------------+------------+----------------+------------+-----------+
| 1                   | Ext4       | / (Arch Linux) | 22         | 24        |
+---------------------+------------+----------------+------------+-----------+
| 2                   | Ext4       | / (Slackware)  | 22         | 24        |
+---------------------+------------+----------------+------------+-----------+
| 3                   | Ext4       | / (Fedora)     | 23         | 25        |
+---------------------+------------+----------------+------------+-----------+
| 4                   | Ext4       | / (Ubuntu)     | 23         | 25        |
+---------------------+------------+----------------+------------+-----------+
| 5                   | Ext4       | /home (all)    | 10         | 10        |
+---------------------+------------+----------------+------------+-----------+
| 6                   | Ext4       | swap (all)     | 6          | 6         |
+---------------------+------------+----------------+------------+-----------+

I'm not sure what to put on the fourth partition.

I've thought about:
+ Darwin
+ OpenSolaris (ruled out)
+ Plan 9 from Bell Labs
+ Debian GNU/Hurd
+ MINIX 3
+ OpenBSD

Does anyone have any suggestions? The OS doesn't have to be UNIX-like, but it should
1. Be either very easy (e.g. Ubuntu) or very hard (e.g. GNU Hurd (aka Hardly Usable: Ridiculously Difficult)) to use
2. Be fully usable (e.g. XYZ Linux) or interesting (e.g. MINIX 3, Plan 9)
3. Have support for the English language (US or UK, I'm not bothered).

[Bazzy]

_{Do you know that for such things exist virtual machines?}

[chrisname]

Yes, but they just don't feel the same.

[1yR4jE8b]

ReactOS

http://www.reactos.org/en/index.html

[tition]

Haiku

http://www.haiku-os.org/

Never tried it myself but after watching the google talk about it, I wanna hear from somebody actually trying it :)

[blackcoder41]

http://puppylinux.org/main/index.php?file=Overview%20and%20Getting%20Started.htm

[chrisname]

Thanks for the suggestions. I had heard of ReactOS before, but not Haiku. As for Puppy Linux, well, I'm already putting 4 Linuxes on that box as it is... I don't need another one :P

[moorecm]

Windows?

[Bazzy]

NTFS means Windows

[chrisname]

Well, it implies windows... I guess it could be OS/2 because they use the same filesystem ID (7). And Linux also has the ntfs-3g driver. At any rate, I wouldn't have an NTFS partition if I wasn't using windows.

[Bazzy]

I guess it could be OS/2 because they use the same filesystem

NTFS means NT File System

[moorecm]

(A filesystem is not an OS)

How about another version of Windows, then?

[chrisname]

@Bazzy,
You misquoted me. I said the same filesystem ID, which is totally different from a filesystem. It marks what filesystem is present on a partition. OS/2 uses HPFS and Windows NT uses NTFS, and both use the same ID.

07 OS/2 IFS (e.g., HPFS)

IFS = Installable File System. The best known example is HPFS. OS/2 will only look at partitions with ID 7 for any installed IFS (that's why the EXT2.IFS packet includes a special "Linux partition filter" device driver to fool OS/2 into thinking Linux partitions have ID 07). (Kai Henningsen ([e-mail]))
07 Windows NT NTFS

Filesystem introduced in Windows NT 3.1. It is rumoured that the Windows NT boot partition must be primary, and within the first 2 GB of the disk.

http://www.win.tue.nl/~aeb/partitions/partition_types-1.html

@moorecm,
I already have one version of windows I don't want, why would I buy (or "buy") another version?

(A filesystem is not an OS)

Who said it was?