Not intentionally trying to hijack this thread into an external HDD discussion, but I too have read that you should treat an external drive as you would a flash drive and always use the safe removal procedure to properly disconnect it from your system. Then you can turn off the external drive, If you do not follow that procedure you will definitely risk data loss.
Conversely, I also read that you should always turn on the external HDD
before you power up your desktop or laptop.
http://www.techieask.com/2010/09/shu...en-not-in-use/
I also agree that a power adapter is the way to go. That and the on-off switch were the two main prerequisites for my HDD decision. I do not want any device pulling on my system that hard, especially through a USB port, as I frequently use flash drives to move files from my desktop to laptop and do not want data transfer slowing down any more than it already does. My desktop still has the older USB 2.0 ports, not the newer 3.0 standard.
I've been reading so much about external HDDs and have come to the conclusion that they all have potential reliability issues to varying degrees, so I'll just pick one from the NewEgg site and see how it works out.
I hope that you sort out your HDD freeze issues and find the source of the problem.