When you rescue your data from a dying hard drive, time is of the essence. The longer it takes to copy your data, the more you risk losing. GNU ddrescue is the premium tool for copying dying hard drives, and any block device such as CDs, DVDs, USB sticks, Compact Flash, SD cards — anything that is recognized by your Linux system as /dev/foo. You can even copy Windows and Mac OS X storage devices because GNU ddrescue operates at the block level, rather than the filesystem level, so it doesn’t matter what filesystem is on the device.
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