All files except HDD icons disappered from desktop

I am using Lion. Suddenly, all of the files and folders from my desktop disappered. I have tried to reset desktop and finder preferences by deleting plist files from Library/preferences but no success. Any idea?

Okay. In Finder if I hit Apple-Shift-C, the drive is there.
UPDATE: In Disk Utility, I unmounted both partitions and then re-mounted them. In Finder Preferences I unchecked External Drives and re-checked it. The drives are back. They came back once before today, but disappeared--we'll see if they stay this time.

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    =====
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