Flash drive not on desktop

Hi, I have a MacBook Air with Lion and when I put in my USB flash drive, it won't show up on the desktop as it should.
I have switched on the finde options that all should be shown on desktop, but this doesn't.
Any idea what to do?
Best,
Anton

If it is not mounting, try "mounting" the drive in Disk Utility.
See if it then appears on the desktop. What is the file system on the drive? (FAT32)?
You mentioned that Show "External Disks" is check-marked, right?

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