Apple have recalled all the 64gb and 128gb ssd drives that are installed in macbook air’s bought between june 2012 and june 2013

if you have an affected machine, you can find more info on apples site:

http://www.apple.com/support/macbookair-flashdrive/

I was unlucky, I purchased two macbook airs in june 2012, and both had harddrives that died within a couple of weeks of each other :( fortunately apple replaced both of them for free :D