Apple Updates Thunderbolt Firmware to Enhance Target Disk Mode

ThunderboltApple released Thunderbolt Firmware Update v1.2, an update that, "provides stability fixes for Thunderbolt and Target Disk Mode." The update is for Macs equipped with Thunderbolt, Apple's next generation I/O interface.

The patch notes for the firmware update:

About Thunderbolt Firmware Update v1.2
This update provides stability fixes for Thunderbolt and Target Disk Mode.

When your computer restarts a gray screen will appear with a status bar to indicate the progress of the update.

Do not disturb or shut off the power on your computer during this update. Note: Your computer must be plugged into AC power for the update to install.

It's a 1.22MB download through Apple's support site. Users with eligible machines should also find it in Software Update/the Mac App Store.