If you wanted to with a RAID 1 or 5, etc. you could use this NAS device. It will do almost anything for you.

http://tinyurl.com/296adl

If you main database is located on the computer with 512 MBs of RAM, if you had to make one purchase at TigerDirect, increasing to at least 2 GBs of RAM would make the most difference. With a hard drive that old make sure that S.M.A.R.T. (if on the motherboard) is enabled. It has saved me at least twice allowing me to clone data directly over to the new WD hard drive with the WD software.

But, my recommendation would be to pick up a new machine with plenty of RAM. And, just becaues you are not buying a computer made to be a "server," and are not purchasing Windows Server 2003, doesn't mean you can't set your system up as client/server based using a new Gateway/Dell/HP or whatever computer.

Bert
Pediatrics
Brewer, Maine