Missing disk space after inserting a USB flash drive

Hello everyone..
I had a little problem with my Aluminum Macbook recently
It started on last sunday, when i pluged in a USB flash drive into my macbook, all of sudden my Macintosh disk free space is gone, from about 50gb left to about 1.5gb...
I ran the disk utility check and repair it fixed the problem, but then again whenever i plug in any usb flash drive(i tried several), it "steals" my free disk space and i have to run th repair programme again..
Any idea of this problem? is it any kind of virus or something else?
thanks

Hi,
*"a restart message."* If it looks like this...
That is called a kernel panic. Sounds like the USB card software/hardware is incompatible with your Mac.
Go here for help to Resolve Kernel Panics
Carolyn
Message was edited by: Carolyn Samit

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Welcome To  Discussions mfidelman!
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HELP puhleeeeze!
This seems to be an issue on various sites with no one being able to figure out what is the cause and a solution. One person stated his problem went away with a fullwipe and clean-reinstall of everything. But this is what I did already.
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Hello everyone,
Ok, I did the ultimate task. I erased the hard drives, AGAIN. Just to start fresh from scratch. Hard drives were erased. Did a new install of Mac OS 10.5. And all was well. I could copy with no problems. I gave the computer to my friend and all was good for a couple of days and then the issue came back again. He couldn't copy anything to his internal hard drives and we received the "Not enough disk space" error message! I was baffled. A complete hard drive erase 2 times, 2 fresh Mac OS 10.5 installs and it works for a few days and then coping to HD we got the same **** problem again! THEN - I remembered that the PRAM battery was dead on this G4 Mirrored-Door Dual 1GHz PowerMac. I had recommended that he get a new battery, because this computer would always have the incorrect date and time after every restart. So with recalling this, I had him reset the PRAM by holding down the CMD+OPT+P+R keys after a restart (start-up Chime). I had him hold the keys for at least 3 start-up-chimes. Soon as the G4 Power Mac started up everything was fine again. He was able to copy files to his hard drives again with the "Not enough disk space" error message.
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