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   Thunderbolt Firmware Update v1.2

   Agen G. N. Schmitz

   Apple has released [1]Thunderbolt Firmware Update v1.1 to address
   stability issues with using Target Disk Mode to boot from another drive
   (which presents your Mac as a connected hard drive). The update is for
   only those Macs with a Thunderbolt port, and it requires OS X 10.8.3
   Mountain Lion or later. As always with firmware updates, we recommend
   relying on Software Update or the Mac App Store app to ensure you get
   the firmware update for your Thunderbolt-equipped Mac, and being
   careful not to interrupt the update process. (Free, 1.22 MB)

References

   1. http://support.apple.com/kb/DL1653

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