I'm experiencing big troubles with my SeaGate Barracuda 7200.10 Ultra ATA/100 500-GB Hard Drive (boxed as an external enclosure) and Mac OS X.
This is the link to the manufacturer's page.
** ISSUES: **
1) When I plug the power adapter, the FireWire 400 or USB 2.0 cable and then turn the disk on, the red LED (disk activity) is permanently active -- i.e. it doesn't stop, even for 1 second.
2) It would be normal for Mac OS X to recognize the partitions and then show them in the Finder. This doesn't happen, and no partition is recognized.
3) The same thing happens with Windows XP (emulated via Parallels Desktop).
4) However, System Profiler seems to recognize it, as you can see in the attached image.
So the disk is recognized, but no partitions are shown.
The disk has 70.000 h of calculated life and I think it hasn't done even 0.001% of them yet.
So I'm asking here for help.