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I recently bought a WD 1TB Black HD and, upon realizing that I didn't have that extra SATA cable lying around, put it in my external USB case until I buy a SATA cable.

The problem is that Windows XP does not always recognize the HD. Sometimes it connects perfectly fine, sometimes it will only be recognized as a USB device which can't be used, and other times, it is recognized, but the read/write light on the case is constantly on, and it doesn't mount properly.

I haven't been able to notice any kind of pattern either, and have also tried multiple USB ports.

Anyone know what could be going on here? Anything I should check?

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Here is a comprehensive list of things you could try:

Troubleshoot: Windows Won't Recognize USB Hard Drive / Fix Unassigned Drive Letter

I personally had problems with some USB controllers on certain machines which didn't provide enough juice to power the disk. There a special cables with two USB connectors which work on such machines.

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Its a 3.5" HD so it has its own power supply. Would the controllers not supplying enough power still affect this? – DeadHead Jul 19 '09 at 18:08
Okay, if it has its own power supply then forget the paragraph. – splattne Jul 19 '09 at 18:22
K, after reading that thread, it seems to be a hardware issue, which is what I suspected... I took my drive out of the case, and it was running really hot, so hopefully, it is just a heating problem, which will be fixed as soon as it is put into my computer. Thanks for the link. – DeadHead Jul 19 '09 at 18:44
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