Hi all,

I updated my laptop to Catalina, and now I'm having trouble with (at least one) 
of my external backup drives. After mounting fine once, the drive now asks for 
passwords (it has encrypted volumes), accepts the passwords, but does not mount 
the drives. If I pull the drive out and put it back in, I get a message that 
the drive needs to be reformatted. [1]

The drive is an apfs drive with multiple volumes.

Has anyone seen this behavior, and, if so, was there a fix which did not 
require reformatting?

While I've tried googling, I've not hit on the proper combination of search 
terms to find anything useful.

Any tips, even for better search terms, would be appreciated.

Thanks,

Bill

[1] Full list of actions:

After I installed, the external drive mounted just fine.

I unmounted it.

I installed an upgraded version of Parallels (15).

I plugged in the external drive while Windows was doing its 
we-have-to-waste-your-time-with-daily-updates routine.

Parallels asked over and over if I wanted to connect to the Mac or to Windows. 
First time I selected Mac, other times the selection window just blinked and 
didn't allow any selection.

After the seemingly endless Windows update, I shut down parallels.

Problems began.


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