I recently wiped my hard disk with a fresh Ubuntu installation. I'm planning to use Testdisk to recover the files.
However, since I do not have prior experience, I feel it would be safer if I could keep an image of the hard drive as well. That way, I can work on the image to avoid wrecking the original drive even more.
I have two questions:
1) Could you suggest a tool for the same?
2) Since I need the image for recovery, I don't want to overwrite the hard disk anymore than it already has been. Hence, could you comment if the tool would affect the hard drive in any way (if it is run via a usb)?