This release of update patch flash STORAGE Firmware update 1.1 is mainly for the 2012 section, there was earlier user feedback that some of the model on the unknown problems caused by the data saved in SSD was erased. If the consumer discovers the problem or cannot install the update on the machine, you can replace the SSD at the local Apple Store for free.
The security bulletin is as follows:
Apple has found problems with flash memory hard drives in part of the MacBook Air model, and has the potential to cause user data loss. This security update is mainly to test your use of the machine is also the problem, in most cases, after the installation of the patch can be fixed to solve the problem. But if you can't update, please go to the local Apple Store for free to replace the SSD.
It is not clear the probability of the problem, nor how many consumers have been affected, but in Apple's Support forum on SSD protection and data loss tag has been searched several times.
Download: http://support.apple.com/kb/DL1690