I have been using my 320GB WD external hard drive and worked perfectly, i suddenly plugged it in but my computer is no longer seeing it. i have tried with other pc's but same problem. the device manager sees that a hard drive is connected but 'my computer interface' does not show it. i really just cant access the hard drive.

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Sounds like the USB interface is working, but the physical drive is not. Remove the drive from it's external case, and try a different hard drive. If that works, your drive is the problem. If it still doesn't work, the USB to IDE interface is the issue.

Try mounting the original IDE drive internally, and see if you can read it there. If not, you'll need to send it to a data recovery center.

Before sending it, keep it in the freezer for 2 hours and check if it is accessible. If so, quickly transfer the data to HDD. If this happens, you drive is no more usable.

These may help you.
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