USB drive doesn't appear

Often when I plug my USB drive (Seagate) into the USB port, it does not appear in the Finder. I have to reboot the computer for it to appear. Is there a reason why this happens, and is there anything I can do besides reboot?
thanks
Scott

USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151?viewlocale=en_US
Common fixes for USB device issues (unrecognized, etc.)
http://www.macfixit.com/article.php?story=20070824012114701
 Cheers, Tom

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Wondered if you could help me out with this problem.
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udevadm monitor
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See
iOS: Device not recognized in iTunes for Windows
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Removing and Reinstalling iTunes, QuickTime, and other software components for Windows XP
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