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Data recovery of failing hdd & disappearing hdd devices

cn flag
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I have a failing 6TB SATA hdd with one NTFS partition (the source drive, /dev/sdc2) from which I'm trying to recover the data. I was using the disk in my Windows PC. To recover the data, I'm using a brand new empty 8TB target drive (/dev/sda2) with one NTFS partition.

I started using ddrescue on Ubuntu 21.04 to do the recovery based on tips I found in this forum. I used this command: ddrescue -f -n /dev/sdc2 /dev/sda2 mapfile

At first, the recovery seemed to go well and reached 10%, then a portion of the disk was giving many read errors and no progress was made. The disk was getting hot and I decided to stop ddrescue and let the disk cool down (shutting down the PC).

I wanted to resume the recovery process again, but now, none of my source or target drives shows up in /dev anymore. At first, I could list them with lsblk, and now, they are not there anymore. I tried to see if they are listed as raw device, but I can't see anything in /dev/raw either. So I'm stuck.

I don't see hard-disk related error messages in dmesg. The disks are not disappearing and showing up again as noted in some threads in this forum, so I can't use the retry trick listed in "Example 6" on the ddrescue man page.

What can I do to make the harddisks show up again in /dev and resume the ddrescue process?

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cn flag
David
You interrupted the recovery time to go to the back up you made before doing that.
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cn flag
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I interrupted ddrescue using ctrl-C as I read on the man page. It took a moment to stop, possibly writing the mapfile before stopping (I guess). Then I did a 'shutdown' of the computer. All seemed normal. Later on I booted the PC again and my disk devices where missing.
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cn flag
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Any tip, anyone?
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