External Harddrive Error

may be power issue, does it freezes on all usb port in your desktop, have you tried with rear usb port.. also make sure you desktop has grounded properly..

What do you mean when you say "make sure you desktop has grounded properly"?

power supply ,, grounding/earthing( are you kidding me)

http://www.wikihow.com/Ground-Yourself-to-Avoid-Destroy...

https://en.wikipedia.org/wiki/Earthing_system

yeah. thats what i thought. just making sure we were thinking the same thing. I use a power bar to ground the computer. The computer i am using is a recent model so I am pretty sure it has a grounded system already built in. Plus, I really don't think it has anything to do with grounding.I guess i did not mention this but it worked perfectly fine before with out any problems. Here is the story: bought new computer, tried external hard drive on it, does not work. After about six months I am able to use my external hard drive perfectly with no problems on the same computer. Few months later re-installed the OS and it does not work anymore. Same location, same computer, same external hard drive.