Hello, I am looking into buying a new hard drive for my webpc (VB90N).  What is the largest size in GB the system can support?  I want to get at least 80gb with a drive that has ATA 100 with a rotation speed of 7200RPM and 2 meg cache memory.  This is the one that I am looking at:

http://www.compusa.com/products/product_info.asp?product_code=294555

Will I have to update the Bios on the system board to get this hard drive to work?  Also, I saw on one of the threads that we would have to put in a Dell hard drive if we upgrade.  But, my computer came with a Seagate hard drive.  So, is that can't be true, can it?  I don't have a credit card, so I would need to get my hard drive from some place where I can go into the store and pay cash.

Thanks in advance for your help.