Why don't extra hard drives show up in finder window?

I have an older MacPro running 10.7.5 with 4 internal drives. Just this morning the three extra drives do not show up in a finder window under "Devices." I used "Disk Utility" to verify all three and no problem was indicated. I checked "Finder - Preferences and under "Devices" all 4 boxes are checked. I unchecked them, closed the window and then rechecked them to no avail. One of them is my backup disk. When I attempt to enter "Time Machine" I get the message "The Time Machine Disk cannot be found." What could cause them to disappear. I have not tried opening the case, removing the disks and reinserting them.

Might be corrupted Finder preferences ...
Open the Finder. From the Finder menu bar click Go > Go to Folder
Type or copy paste the following:
~/Library/Preferences/com.apple.finder.plist
Click Go then move the com.apple.finder.plist file to the Trash.
Restart your Mac. See if external drives mount in the Finder.
message edited by: cs

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Why is my external hard drive showing up twice on Time Machine?

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Triple-click anywhere in the line below to select it:
tmutil destinationinfo
Copy the selected text to the Clipboard (command-C).
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☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
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hello
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Quote from: Sick my Duck on 13-February-14, 16:53:42
Thank you very much for your response darkhawk.
So either way I will always be able to fit a 2nd hard drive in there?
Because there is only one hard drive in there, which means there is a free bay physically (wether it is for SATA or SuperRaid 2).
Are there GT70 models that don't have 2 bays? (This was my initial question, I now notice it was confusing.)
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A GT70 is a GT70 is a GT70.
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Rich

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http://support.apple.com/kb/TS2474

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http://www.youtube.com/watch?v=dnYjCML3gv8
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Why don't extra hard drives show up in finder window?

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