I work at a university and all of our students are required to purchase their own hard drives for use with iMovie (intro students) and FCP. However, several of them have gotten the Western Digital "My Book" drives and I'm having issues with them. On some computers, they work fine, while on others they won't show up at all. One of them that worked on one computer the week before now won't recognize on that computer any more.
We're working with some brand new 2.4Ghz iMacs and several older eMacs. All running 10.4.10. The odd thing is, the drive I'm currently diagnosing works fine on the eMac I put it on, but won't recognize on the new iMacs (won't show anything even connected to the firewire port under the System Profiler). Also, when I restart the iMac with the drive plugged in (but powered off) the computer stalls on a blank screen. All drives that I've been able to connect at least once have been formatted to the Mac OS Extended format.