Mac-formatted external HD only access with Disk Utility

Hello!
I read a lot about problems with Mavericks and WD harddrives. But i did not found anything about my problem:
- bought a new HD and formatted with Disk Utility
- copied all important data to it, all fine
- next day for my surprise i couldn´t see this HD in Finder
- looked in Disk Utility and the HD is there
- if i click on the drive and "open" then i can see it in finder and have access to all data, but if i click on "reveal in finder" i can´t see it!
- i started CarbonCopyCloner and did a complete backup to a new second backup HD, CCC recognized the HD and everything worked fine
- now the backup HD has the same problem, i can see it only in Disk Utility
- it seems that the error moved from one drive to the other, so my guess is it has nothing to do with brands or a hardware failure
- i´m searching now for hours but i don´t find a solution
- i now have one (very important) data HD and a backup HD as a clone with the same problem
- all other HD´s i have are showing correctly in finder!
Does anyone have any ideas?

After hours of searching this is the solution:
Open Terminal, then
defaults write com.apple.finder AppleShowAllFiles TRUE
killall Finder
sudo chflags nohidden /Volumes/"Name Of Drive"
killall Finder
defaults write com.apple.finder AppleShowAllFiles FALSE
killall Finder
This thread helped me:
http://forums.macrumors.com/showthread.php?t=209905&highlight=drive&page=4

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