This drive was dropped and has had a head swap. There is no visible platter damage, but there may well be some. The drive will eventually come DRD (on occasions) and I have managed to get a back up of HDD resources. In Data Extractor the drive will read very slowly, it reacts almost like it has the Pending Bug with the drive working away in the background. I have attached the terminal output as it changed depending on whats happening to the drive at any particular time. This could be platter damage, but your input would be appreciated.

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HDD, SSD, Flash and RAID Data Recovery
Founder of The Data Recovery Professionals Group

I've had several discs that model and I had bad heads
i doed heads exchange and as well as slow reading.
but I was able to clone the 99% aproxi but very long time, aprox 1 month.