I have a raw disk image I took using
dd of a Ubuntu instance. The total disk size is 300 GB, but only 5.5 GB used.
Is there a way to resize the raw dd image down to 20 GB, keeping all of the 5.5 GB of data, and just truncating empty blocks?
In its normal use, it writes a temporary file and then rewrites the original, with holes.
If you’re short on disk space, it can even reduce the file in-place, without writing a temporary copy, with the
-i option, though this may not free up all possible space.
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