I have a windows XP machine (32 bit) that I'm now using to store all my DVDs and media. I already had 3 1TB drives set up in a raid which gave me about 1.8TB storage. I bought another drive and since I was having some issues with applications decided to reformat and rebuild the array from scratch (had the data backed up). I'm using an ASUS A8N Sli Premium mobo with a raid5 controller built in. Now the odd thing is this: when I try to create a new RAID 5 group with 4 drives (all the same 1TB drive) it gives me a max size of 746 GB. If I build one with just 3 drives, I get my 1.8TB again. This makes no sense and I can't figure out what to do. Any help is appreciated.