I'm in the process of creating a disc image and I'm reviewing whether to continue or not, any advice on what you would do in this situation would be greatly appreciated.
I have a WD My Book Live 3TB that has failed, I've removed the HDD mounted it into a dual USB3 dock and am 3 days into a 41 day clone of the drive.
Prior to this I first tried Disk Internals to try and read the drive
I'm using windows 10 Pro on an Intel Core i5-6400 CPU, 64-bit OS, x64-based processor.
I first tried Linus DiskInternals Reader to copy the data, the programme read the drive as;
WDC WD30 EZRS-11J99B1
K: 2794.52GB Linux Swap
Linux Ext Vol 1 1.91GB
Linux Ext Vol 2 1.91GB
Linux Swap Vol 1 489MB
If I try to access these files through DI Reader I get the error;
"Can't open disk: K:
Check the disk and try again.
Thinking I had a damaged partition I then downloaded DiskInternals Partition Recovery
Using that I scanned the drive and selected “Yes”

I then tried R-linux to try and recover damaged partitions, in running “open drive files” the programme generated errors in trying to read the disk (see screenshot below).


A quick test gave the following error.
Test Option: QUICK TEST
Model Number: WDC WD30EZRS-11J99B1
Unit Serial Number: WD-WCAWZ2745213
Firmware Number: 80.00A80
Capacity: 3000.59 GB
SMART Status: PASS
Test Result: FAIL
Test Error Code: 06-Quick Test on drive 8 did not complete! Status code = 07 (Failed read test element), Failure Checkpoint = 105 (Unknown Test) SMART self-test did not complete on drive 8!
Test Time: 14:58:11, August 08, 2017
SMART Test result;

I have since removed and reinserted the HDD into the other dock and tried creating an image again, this time it began working and until today looked ok.
However since the early hours of this morning it began returning the Read disk XXX at position XXXXX failed after 1 attempts. The request could not be performed because of an I/O device error, again.
I'm conflicted now as to whether to continue with the disk imaging and risk the drive failing in the month it'll take to scan or to go again and try and read the disk and access whatever I can now, but knowing that I may not be able to start the image cloning again...
Most of the contents is movies and music, which although is a PITA to lose, it's not the biggest concern.
I have photos and files that I do wish to recover and although I have backed them up I'm fairly sure that there are some that aren't on the most recent backup.
Is there a way of imaging only this section of the drive? I'm thinking only if I can read the folder structure of the main partition, which I haven't been able to so far.
From what I can guess it's a bit of a gamble either way, most advice I've read suggests cloning the drive is the priority (and that seems wise) but the time it will take to do this I think increases the risk of a total failure.
What would you do?