Upgraded my PowerBook G4 to Leopard 10.5.8 - USB/Jump drives won't mount

I just upgraded my OS to 10.5.8. Now, when I boot with any attached jump drive it pops up on my desktop for about 10 secs and then gives me a dialog box with a big stop sign w/exclamation point and reads "device removal" - the device you removed was not ejected properly....the 'icon' for the drive disappears and if I try to re-insert it, it doesn't read it. Any ideas why that might be? I have run all the software updates earlier today. What could I be missing?

Thank you so much for the suggestions. You are correct, in 'wiggling' the drive it seems to read and then not read...the jump drive is definitely damaged. I will make attempts to pull files slowly, one at a time. Yes, I wish I had a back up but I don't. I should have burned the files on a CD as a second back up but didn't,my bad. It's okay, I'll have to manage. I'm happy it's not my USB port but a faulty drive. Thank you again for helping me out, greatly appreciate it.

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http://support.apple.com/kb/TA24950
Leopard is no longer available at the Apple Store but may be available by calling Apple Phone Sales @ 1-800-MY-APPLE (1-800-692-7753).
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MB427Z/A Leopard 10.5.1 install DVD
MB576Z/A Leopard 10.5.4 install DVD
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MB022Z/A Leopard 10.5.6 install DVD (5-user family pack)
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http://support.apple.com/kb/HT1544
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Upgraded my PowerBook G4 to Leopard 10.5.8 - USB/Jump drives won't mount

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