My internal drive keeps ejecting - why?

I have 4 bays on my Mac Pro and each one contains a drive: the HD on which is the OS (ML- at this time) and three scratch drives for media.
The largest of these drives is a 3TB one. Every morning I wake up my MacPro and see the message that my 3TB drive was not ejected properly and that the OS will try and do it's magic next time it is connected. As stated, this is an internal drive and not an external one via thunderbolt or FW or USB.
Is this common? I have important media on this drive for a client and cannot be restarting my MacPro every morning.
Regards,

That error is indicative of a serious problem with the drive. The logs may indicate that it has suffered an I/O Error.
You need to back up anything that has not already been backed up right away -- it may already be lost. Most drives never recover from this.
Do not delay in buying a replacement drive -- you WILL need it.
At a minimum, you should attempt to Erase the drive and write Zeroes to every block. But I do not hold out any hopes for it ever working properly again. Drives that do this may be good for nothing but a doorstop.
Many users find that using a small fast Boot Drive -- containing nothing but System, Library, Applications, and the hidden Unix files including Paging/Swap -- gives them a slight overall Performance boost. User files are moved off to other drives to keep the System's incessant "snacking" from the Boot drive from slowing down the other drives.

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