There's some weird stuff under Ubuntu Feisty I can't fight.
I've got a drive with md0 & md1 on it. I'd like to erase this so that it would look like new.
1. fdisk then d then w - deleted all partitions and rebooted
2. even dd if=/dev/zero of=/dev/hda count=1 bs=512 to erase mbr with partition table alltogether (though mbr has nothing to do with this)

Still, if during ubuntu install I create partitions of exactly the same size those md0&md1 partitions were and of the 'RAID' type, at the step I enter RAID menu aiming to create new partitions (on the RAID ones), installer would tell me that there are no partitions available. I step back and here we go! Installer shows me ext3 partition on md0 and swap on md1.

How could that be? I'm stunned.

Thanks.

Not sure what you are trying to do here. Is your hard drive setup RAID? What sort of RAID (RAID0, RAID1, RAID5)?

If you want to continue to use a RAID setup, they will be called md something, just as scsi ones have sd and normal IDEs have hd.

It's RAID1.
The prob is sorted out wiping the drives.