I need to recover a 3TB USB HD. I started making a copy yesterday by running ddrescue in Terminal entering:
sudo ddrescue -v -f -n /dev/disk3 /Volumes/Seagate/disk_rescue.dmg disk_rescue.log
I've only just learnt how to use ddrescue so I was thrilled that it worked at all. It got to 1071 GB rescued (with no errors so far!) when I realized that a 2TB destination drive is going to fail when it runs out of space - oops.
I interrupted the copy with Ctrl-C and ran out and bought a 4TB hard drive to use as the destination drive instead. 4TB because I read that it needs to be bigger than the input drive to have enough space for the log file.
So my question: can I resume the copy of my failing hard drive on the new 4TB destination drive using the log file? Or do I have to start again from scratch? It's been running for about 16 hours so far, so if I don't have to start again that's a big time saver.