I have a dell server with two 18 gig drives in a Raid 1 config. I want to replace the drives with 400 gig drives. If I break the mirror and then remove one of the 18g drives, insert a 400g and create the mirror, then do the same process again with the other 400g drive, what will I have? I would like to think I would have a new 400g raid 1 drive. But I seem to remember that this process might result in only 18g of useable space on the 400g drives. Anyone know for sure?