Repeated External HD Failure - Please Please Please Help.

I am running a 2012 Mac Pro with Mountain Lion.
I have now had 3 external HD failures by it ejecting itself and never mounting back again.
All 3 External HD's have been used for my archiving my photo's and Lightroom Catalogs.
My current set up is running 3 HD's at once via a USB Hub, (1) Photo HD, (2) Back Up HD and (3) Time Machine HD. All 3 HD's are the same brand and model.
My Backup and Time Machine HD's are all fine and have never been a problem.
My Photo HD has failed 3 times. It ejects on it's own accord and then never mounts again. I do back up the files to my Backup drive so I have only lost a few days work, but WHY is it this same drive set up continues to eject and then never mount again. As it has happened 3 times, each time I have had to put in a brand new drive back in, I am totally confused and completely fed up with it all. Why is it only my photo drive that fails and dismounts.
I have backup my HD to my Backup drive and also to Crash Plan so not data has been lost, but WHY is it happening and to the same drive set up only.
If anyone has any suggestions why this is happening and better still a way to resolve it I would be eternally grateful as I am now worried about losing my photo work.
Regards
Matt

Wow. This sounds nasty. I don't want to lose photos either, so even though I don't have any ideas on the root cause, maybe I can help to make sure your photos are safe.
I also have a Mac Pro - it is the tower machine, right - not a laptop MacBookPro.
You are using an external USB hub? Why? Do you not have enough ports on the machine itself. My machine is fairly old, but it certainly has enough ports for this many external disks.
Why are you using USB disks? Macs tend to like Firewire better, which is what I use almost exclusively.
How many disks do you have inside the computer? Are all 4 internal disk bays full? If not, I'd suggest adding an internal disk for the master copy of your photos. It is faster than an external disk anyway, and likely more reliable.
I recently just purchased a USB3 card for my Mac Pro. Your's may already have USB3 ports. I'm using a 1-TB USB3 disk for my manual backup. I copy the photos from the master to this drive manually, so I know exactly what is on it. Then I keep this very small drive at another location. This is my backup of backups, so even if the Timemachine or other backups fail, I know I have the majority of my photos safe.
I'll follow up a bit more once I know more about your configuration.

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