Raid drives???

[GeraldCC]

Hi Guy's
I have the ALT version on KUbuntu installed on a AsUS motherboard 2GB ram 3-
core CPU and 3 sata2 drive each of 160GB.
I have md0 --root
md1 ---swap
md2 ---/home
md3 ---?? should be /mnt/data

Now md3 has data in from PCLinuxOS when it was installed.
I cannot get md3 to mount. I get all sorts of problems. From drives (sda4-sdc4 
or sda5-sdc5) not being there or allready in use or not formatted correctly???
I have done re-install of KUbuntu and let it make the raid device md3 and 
formatting it, but it is still not mountable.
Is there something going on that is not documented in the 10.04 Server book, 
or will KUbuntu not run on this system???

Many thanks for your support

Gerald