Formatting/erasing USB memory stick using Disk Utility - won't unmount

Hi,
I've got a 2GB USB memory stick, and I'm trying to format it by erasing it on Disk Utility just as I have done with many USB memory sticks before now.
Whatever I try to do with this one though I get the error message:
"Volume Erase failed with error:
Could not unmount disk."
There are no manual switches on the USB memory stick to change, and I've checked that I have read/write privileges so I don't know what else to do. I can't find anyway of unmounting it.
I need this memory stick for transferring a large amount of files and it's the only one I've got, so any help that would stop me from buying a new one would be great!
Thanks people.

sorry bro it's toast. the only time i had something like this happen the manufacture said the drive had to be re-flashed. if they provide the software online you got lucky. other wise they will tell you to send in and get it replaced (warranty valid)
Message was edited by: realhiphop0331

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Message was edited by: roeiboot

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Message was edited by: Glenn Leblanc
Message was edited by: Glenn Leblanc

Formatting/erasing USB memory stick using Disk Utility - won't unmount

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