Cannot find external disk

I have two external disks attached to my system.  One is attached via USB to an Airport Extreme.  It is used as the target for Time Machine backups from both my iMac and my MacBook Pro.  Software is up to date on both machines.  The other disk is used for user files and is attached directly to the iMac by USB.
"Suddenly" the backups failed, because the connection to the disk failed.  Neither disk appears in Finder.  I've tried some cable and port swapping, rebooted, etc. but still have no clue what's happening.

No.
JS

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