Files (temporarily) disappear from USB Hard Drives


i have 2012 mac mini 2 external wd hard drives hooked (usb3.0). both drives formatted hfs+.

when first boot, hard drives fine. disk utility says verify fine, no action taken if attempt repair them, etc. well.

@ point (haven't figured out how tell "when" happens, less why) files no longer appear. hard drives report proper size\available space, if open of top level directories in finder, they're empty, , applications expect files there, find nothing.

attempting verify or repair disk @ point throws bunch of errors. can force eject drive if want to, can't mount again. when reboot - well. disk utility happy again. smart reports drives have no issues.

i'd chalk failing hard drive, it's happening 2 newer drives, seems unlikely. have both drives encrypted using filevault2 - both drives being decrypted see if still happens when drives aren't encrypted...

in mean time, has experienced this?
 



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