Wow, that's a surprising limitation in a modern computer. I honestly didn't try a 500 gig drive but the Sony W seems to have a very modern BIOS and I wouldn't expect that limitation.
Thanks, the issue is that the manufacturers will intentionally limit the capabilities of these machines because they are so cheap. They would rather sell you a real notebook at a higher prize. Sony historically have been no better that LG in this regard, so I am still hoping for success reports from someone who have tried a 320GB+ drive in the machine.