Finder not able to view folders and files on EHD after updating to OS X 10.9.4

I can see still see 'Hitachi' in the 'Devices' Sidebar, but I am not able to view folders and files on this Hitachi XL2000 2TB FAT32 Hard Drive (EHD) that is USB connected to the iMac below.
Late 2013 Apple iMac (27-inch Display 2560 x 1440), 3.4GHz Quad-core Intel Core i5, Turbo Boost up to 3.8GHz, 8GB 1600MHz DDR3 SDRAM - 2X4GB, 512GB Flash Storage, NVIDIA GeForce GTX 775M 2GB GDDR5, Magic Trackpad, Apple Wireless Keyboard and OS X 10.9.4 Mavericks
All was fine until I updated from OS X 10.9.3 to 10.9.4 earlier this week, so now when I double-click on 'Hitachi' it just loads and loads with nothing happening and never displays the folder and file contents of the EHD.
Also, confirmed that Hitachi EHD has been removed from Spotlight indexing per System Preferences > Privacy > + > Hitachi and it was so this does not seem to be an indexing issue.
I have used OnyX and Apple Disk Utilities unsuccessfully to try and fix this problem.
Interestingly, Backblaze online backup still sees the EHD and connecting this EHD to a Win 8.1 PC also sees the EHD.
Further, I ran the commands below in 'Terminal' to make sure the drive was visible and got the following results which shows that the EHD is not hidden.
iMac:Applications john$ chflags nohidden /Volumes/Hitachi/
iMac:Applications john$ GetFileInfo /Volumes/Hitachi/
directory: "/Volumes/HITACHI"
attributes: avbstclinmedz
modified: 07/10/2014 23:26:44
Finally, I installed XtraFinder and am still not able to see the contents of the EHD, but when I installed OmniDiskSweeper I can navigate the EHD folder tree with no problems and can see the contents of the EHD, but when I try and open up a file it opens Finder which loads and loads and nothing happens.

Apple Support was quite helpful, but in the end I will wait to do a clean install of OS X Yosemite which is due in the Fall and not try and fix OS X 10.9.4 Mavericks.
It turns out that I run backups on my '/Users/john/Library' and the size of this folder before the 10.9.4 update was 1.07 GB and after the update it is 806.9 MB which is baffling, but in the end all of these problems should be resolved with a clean install of OS X Yosemite.
One lesson learned for the future is that I will wait on installing an update until it has been in the wild for awhile as a quick OS X Mavericks Finder Problem search and similar searches show there could be an issue.

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