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Update, I followed the troubleshooting guide and a reinstallation of the drivers seemed to fix the issue.
Just need to sort out the license (I had a free one with the Seagate drive) - raised a...

I have a Seagate 3TB external drive that used to work.
I've just upgraded my Mac to Sonoma 14.1.2 (23B92)
And the disc won't mount. No errors. Verify is OK. Repair is OK.