btw, just a heads up for crucial m4 owners and ones that maybe on the market for it. there seems to be an issue with the drive once it nears the 5200 hour mark. more info here:
Re: 0x00000f4 error on M4 64GB - Page 9 - Crucial Community
just before everyone goes into panic mode, 5200 hours = 216-217 days of continuous use so this may not apply for most people yet.
edit: i own an m4 128gb myself and haven't noticed any issues yet. most likely because i an nowhere near that 5200 hour mark.