What Is The Biggest External Hard Drive For The Ps3 External Hard Drive For Ps3?

External Hard Drive for Ps3? - what is the biggest external hard drive for the ps3

I bought a simple technology, 320GB HD at Best Buy. My PS3 can not read it yet, my computer would. I did some research and found that it should be FAT32. I format using the command prompt. When you finish the message said it was too big for FAT32. Can anyone help please?