Whether you’re trying to rescue data from a dying storage drive, backing up archives to remote storage, or making a perfect copy of an active partition somewhere else, you’ll need to know how to safely and reliably copy drives and filesystems. Fortunately, dd
is a simple and powerful image-copying tool that’s been around, well, pretty much forever. And in all that time, nothing’s come along that does the job better.
Using dd
, on the other hand, can make perfect byte-for-byte images of, well, just about anything digital. But before you start flinging partitions from one end of the earth to the other, I should mention that there’s some truth to that old Unix admin joke: “dd stands for disk destroyer.” If you type even one wrong character in a dd
command, you can instantly and permanently wipe out an entire drive of valuable data. And yes, spelling counts.
Remember: Before pressing that Enter key to invoke dd
, pause and think very carefully!
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