If you use a Mac, MacBook or MacBook Pro and have replaced your hard drive with one of the newer hybrid SSD/HDD hard drives from Seagate, you might have stumbled upon quite a lot of issues with the drive.
Firmware SD22, the first firmware of the drive, was interesting on the Mac since the drive constantly went to sleep and then back again. Users were reporting around 20.000 on/off cycles per month.
Firmware SD23, released in summer 2010, disabled the power management of the drive completely under Mac OSX. It did not respond to sleep commands, and it did not spin down as a response to the sudden motion sensor. Users reported battery life of their laptops dropping to minutes instead of hours. Firmware SD23 also locked the system periodically, which meant that the Mac became useless for watching longer movies.
Last Friday on December 9, Seagate has now finally released firmware SD24 which fixes all the issues in SD23. The drive no longer locks the system, and it should now also properly respond to sleep and sudden motion sensor events.
If you own a Mac, MacBook or MacBook Pro and have replaced the built-in hard drive with the Seagate Momentus XT, you should definitely download the latest firmware now. To find out if you need to upgrade your firmware, you can open the System Profiler by clicking Apple -> About This Mac -> More Info…
Download Seagate Momentus XT SD24 firmware
Some users on the Seagate forum have reported that they had problems running the upgrade on their MacBooks. I did not, but if you cannot run the upgrade you should check out this thread for a solution.