UHHH You are correct GB NOT MB. Silly mistake. Not that long ago 128 mb hard drives existed... As far as upgrading an ultrabook goes, they are certainly not as easily upgraded as a typical notebook or desktop due to their newness and slim form factors and designs. That does not mean they are not or you should not upgrade. Thank you for responding, however I am hoping for a bit more technical answer. For example, Im fairly certain now that it is possible and have learned that the existing drive is a pci express msata. Ive even seen some pics of the drive. What I am not certain about is if Vizio is using some sort of proprietary configuration I need to be aware of. For example, this book uses a "hibernation" partition which I have learned can be utilized many ways by manufacturers as a sort of cache. typically used with Intel Rapid Start Technology to resume the pc sate quickly but may be used a variety of ways. I would still appreciate any thoughts or comments on the upgrade possibilities.