On Jan 2, 2012, at 9:53 PM, Kevin wrote:
Please help shed some light on this unusual problem.
Tina hit the nail on the head, the fact it affects to different Macs, one PPC and one Intel, running two versions of OS X, 10.4.11 & 10.6.8, would seem to indicate this issue is a hardware issue related either to the enclosure bridge or the HD. Since the enclosure is both Firewire 800 & USB 2.0, have you tried it with USB 2.0? I'd try USB 2.0, and if it works, just use USB 2.0 rather than Firewire 800. There is almost zero speed difference because the bottleneck on a single HD is the HD itself, not the type of connection, they're all faster than the HD.
You can check for error messages related to Firewire using Utilities>Console and searching through the messages for anything related to the Firewire bus or this HD.
Often there have been firmware updates for enclosures that work poorly, but your enclosure appears to use an Oxford 943 chipset (OXUF943SE) which doesn't appear to have any firmware updates that might fix your issue.
I think switching to USB 2.0 is your best bet. If USB 2.0 doesn't work in a similar fashion, it's FOR CERTAIN the HD. You might be able to backup the data and reformat the HD completely, or use DiskWarrior to fix, but most likely it overheated in the small, fanless enclosure, which is common, and the HD would likely be dead for all practical purposes. S.M.A.R.T. data doesn't work for HD's in external enclosures, BUT, if you can place the HD into a regular desktop or laptop attached to the internal bus you can use a utility that can access the S.M.A.R.T. data which should be able to tell you if the HD overheated or has other fatal defects.
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