Apple today released Thunderbolt Firmware Update, a small update offering "performance and stability fixes" for machines supporting the new high-speed data connectivity standard.



From Apple Insider:

Do not disturb or shut off the power on your computer during this update.There is no indication of exactly what the update does beyond the general note regarding "fixes". It is also unclear from Apple's description exactly which machines the update applies to, as Apple does not specify on the download page whether it applies to the company's latest MacBook Pros or iMacs or both, although the update page displays an image of a MacBook Pro. Consequently, all users of Thunderbolt-enabled machines should check Software Update to see if the update is available for their machines.

  Apple Releases Thunderbolt Firmware Update