Apple has released a firmware update for Thunderbolt



From TUAW:

Have a Mac equipped with Thunderbolt? Then head on over to your friendly neighborhood Mac App Store this morning, click on Updates and get yourself a nice firmware update.

Firmware update v1.2 for Thunderbolt "provides stability fixes for Thunderbolt and Target Disk Mode" and requires a machine restart.

  Apple issues stability fix firmware update v1.2 for Thunderbolt