It's not clear if it uses a 9.5mm or 7mm 2.5" drive. From the Best Buy comments:
$50 more? Probably upgrade to a 4GB stick of RAM if you can use it for Marketplace stuff:
http://www.bestbuy.com/site/corsair-...e/1305172751.p
StartMenu8 is free:
http://www.iobit.com/iobitstartmenu8.php
You can also use Windows Defender for free Antivirus:
http://forums.anandtech.com/showthread.php?t=2325766
Although my current recommendation for keeping your computer clean is Avast Internet Security 2014 ($40 a year, or $80 for 3 years), which includes a feature called SafeZone, which runs Chrome in a fullscreen virtual environment to completely protect your computer while on the Internet:
http://www.avast.com/en-us/internet-security
It basically bulletproofs the laptop, similar to how the Chromebooks operate...all of the Internet-based stuff lives in a secure environment. In Avast, you can reset (wipe) the Safezone any time you want, although you can still optionally choose to download & save files you want to keep in a folder on your computer, so it's not like you're completely locked out (you can then scan those files in Avast to check for viruses).