Hard disk Western Digital KO!

since I upgraded the operating system to Maverick on my imac I lost all backup data on an external drive that I had the Western Digital to do with Time Machine. In addition, such a disk, 1TB is practically unusable. What i can do?

Agree with macjack.
I have a WD 1TB drive that I formated after buying it and have never had an issue with data loss. It's used as my LAN Time Machine back up for 3 Macs. Also, no operating system installs ( OS X 10.8 and 10.9) have caused any issues with it.

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    Hello, thank you for looking at my question.
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    carroteye wrote:
    Hello, thank you for looking at my question.
    First off, I am NOT very tech-savvy, but I'm willing to research and learn, I'm just afraid to make a mistake and blow up my computer.
    Good! Better to inquire than leap!
    I have had my Macbook for 2 years. I have not backed up my hard drive during that time. Bad, I know.
    Yup.
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    |
    It's a toss-up; try to diagnose what's wrong, or try to get a backup.
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    |
    The copy may take a very long time. There will be a progress bar, but they're notoriously inaccurate under the best of circumstances. If it completes, and you can start up from the external, post back and we'll see if we can find the problem, and either fix it or confirm that you need to take it to Apple.

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    John Danger wrote:
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    What is the manufacturer of the external and how old is it? Does it have its own AC power supply or is it USB bus powered?

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