I have 4 year old Dell Poweredge SC430 with two 80 GB SATA disks using RAID mirroring in Windows 2003 . They are configured 30GB C: for system files, 50GB D: for data. The Data partition is getting low on space and I want to increase disk capacity whilst maintaining RAID. Dell tell me I can only have two disks in the box, so I cannot add extra disks. I am thinking of replacing the two disks with higher capacity disks. My plan would be to break the mirror, put in one higher capacity disk, recreate the mirror, break the mirror again, take out the other disk, then put in the second high capacity disk. Is this is sensible plan? Any issues? The server is a basic file/print + exchange server for a small office (6 staff).