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When I turn on my 2 terabyte LaCie DD3US external hard drive, disk appears to rotate but I get a red light along with the blue, and clicking noises, and the drive's icon doesn't show on my iMac screen

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Jim LeVerso - IT Services and Support

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If the device doesn't show up in Mac System Profiler at all or as an unknown device:
The symptoms indicate there is a problem with the drive, how it is connected, or with the computer used for troubleshooting. The next best step is to change physical variables, and find a simpler problem than a broken product.

  • Change the data cable (USB, FireWire, Ethernet, etc.) A failure in the cable can cause this issue.
  • Change the external power supply or cable. If possible, obtain another power cabling to see if the problem is in that component. On drives that are powered via USB or Firewire, try using the included power sharing cable and connect it to another port.
  • Change the computer you are using. Computer problems can manifest themselves in many ways. Even if the computer appears to be working properly, this is a worthwhile test. Try it on a friend's computer and see if it works fine.
If the tests above don't help, it's possible that the drive was either dropped while running, had a hard drive 'head crash' or the circuitry inside the drive is fried.
Hope this helps!

Posted on Jun 20, 2011

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