Have a client 2.5" laptop drive, was part way through data recovery with read rates periodically varying between 80MB/sec down to 1MB/sec until eventually it stopped responding and timed out entirely.

Won't connect under Linux with eSATA, USB2 or USB3 interfaces any more ( -110 error ).

All I can hear from the drive are about 20 attempts to find something and I can hear it doing a double-tap, pause, double-tap, pause about 20x and then it eventually spins down.

Possible causes?

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Oh joy :\

Wonder what has caused them to go bad in this case. Guess I'll just put it on the ever growing pile ( about 300 drives now ). At least I managed to haul 20GB off ( out of 500GB ).

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You have a backup...right? | Tech Repairs on YouTube

Momentus 5400.6 drive, right?
This drives with bad sectors are tough to clone (usually are accompanied with weak heads).
I'm cloning one of this right now in DE, however problem with your hdd is different then mine.

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My firmware database:
https://mega.nz/folder/O01DkBRI

That's the type, yes.

The client doesn't want to go with the expense of a head replacement, so I just let it run through the night periodically to see if it'd give me a bit more life ( Have had it happen before, just getting lucky ); thus far though it is insisting still on staying dead.

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You have a backup...right? | Tech Repairs on YouTube