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I tried running testdisk on /dev/sdb, as you suggested, but I still get the same result.

I have a Seagate Freeplay 1500GB external HDD that stopped working. There were no lights on, no noise, no power so I removed it from the enclosure and mounted it on an external caddy.
The Mounted HDD shows up in explorer but does not let me open it - "F:\ is not accessible. The parameter is ...