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How to nuke a hard drive with Ubuntu live CD

When selling old hardware, for instance an old laptop or external hard drive, you want to make sure nobody can access your private traces and data that you left on the device. Even if you clear the trash bin of your computer, the data is not always gone and can be recovered. In fact, the data is marked as deleted but can still be accessed and restored using special software tools. The data will be removed ultimately only after it is overwritten by new data.

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