Yes, but. RAID 1 is no problem - the second drive is a mirror of the first, at the hardware level.

RAID 0 will also work, but you will have two partitions, not one large partition.

RAID0 is a very dangerous option - your chances of failure double because the integrity of your data depends on two drive, and if either fails, recovery is just about impossible.

Felix,

Thank you for visiting the Dell Community Forum.

You can find basic information on configuring the various types of RAID setups on pages 22-28 and page 112 in the Dimension 8400 Owner’s Manual which is available online at the following location:

http://support.dell.com/support/edocs/systems/dim8400/en/om/U70350LRs.pdf

RAID 0 provides faster access times since the data is spread over 2 hard drives, the drives both work together in finding information. It provides more performance (usually the heavy gamers would go for this setup, or if you don't need to worry about hard drive failures)