Anybody knows what might cause this bug to occur:
http://trac.linuxmce.org/trac/ticket/2140
Possy saids he has extra drives running without issues which seems strange if that ticket is valid.
Just to prove my answer:
dcerouter_112602:~# df -h|grep device
/dev/sdb1 917G 38G 834G 5% /mnt/device/28
/dev/sdd1 932G 886G 46G 96% /mnt/device/46
/dev/sdc1 3,7T 1,8T 2,0T 48% /mnt/device/428
I did notice the fresh install of 12.04 it didn't pickup my software raid as it did in 10.04 and 8. I didn't think anything of it because that's what I wanted.
Come to think of it, it also didn't prompt to use the HDD's in my MD's either. Again not an issue for me, because I'm not using them.
root@moon67:~# fdisk -l
Disk /dev/sda: 160.0 GB, 160041885696 bytes
240 heads, 63 sectors/track, 20673 cylinders, total 312581808 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe6c4e6c4
Device Boot Start End Blocks Id System
/dev/sda1 * 63 312575759 156287848+ 7 HPFS/NTFS/exFAT
Formated MD's the drive to ext4 and it was detected fine.
Yes, thats how I also ended up fixing it. All content lost though.. I think the issue was that a swap partition did not have a UUID.
If someone else also as an issue with a drive that does not get detected first check if it has a uuid:
sudo blkid