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i can tell you from personal experience
about 20 years worth.
the drive is probably good. the enclosure is what has failed. take the drive out and hook it up to either an adapter or another known good enclosure
best of luck fellow gun nut
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Some of the external WD drives have special connectors. Instead of a sata connector on the drive inside the enclosure, it has a usb connector.
When the firmware fails, the drive can start transferring data very slowly (as in 20 kb per second slowly), or not show up at all.
I had one do this, it was a 1 TB and I had to let it transfer data for a week to get the data off, and then it got destroyed.
The drive itself was good, but the firmware got corrupted and went into a failsafe mode with slow transfers. It was a known issue with those drives, and you couldn't rip off the enclosure and pop the drive into a host machine to fix it.