External USB HDD not being detected, beeping

I have a 640GB Transcend USB 2.0 hard drive that sometimes won't be detected and keeps beeping. Unplugging and re-plugging in the cable always fixes this, but it's annoying to have to keep unplugging and re-plugging, not to mention probably not good for the drive.

I've gone to device manager -> USB controllers -> right click, scan for hardware changes, but it doesn't help.

I've got a cable with two USB ends, and I've plugged both into USB 2.0 ports at the back of my desktop computer. I do have USB 3.0 ports - would it be a good idea to plug both cable ends into USB 3.0 ports for additional power, or is this a bad idea? Should I plug one into USB 3.0 and one into 2.0?
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More about external detected beeping
  1. Bump?
  2. No-one?
  3. This is still a problem..
  4. it beeps even with both ends plugged in? its OK to use both USB 3.0 ports.
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