I experience this with 4 different WD drives bought at different times. Some are USB bus powered, some have external power. None support SMART (I haven’t seen any external drives that do afaik).
Like I said in the original post, they mount and work fine after I do it manually from a terminal, and it resolves after a reboot (for a while, anyway). My guess is that there’s some process that’s supposed to unlock FileVault-encrypted volumes when they’re plugged in, but it stops doing that on my machine for some reason.
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