Pen drive will not appear or format on iMac

Hi
I have a 16gb hp pen drive and i used it with my imac one day then the next it will not appear unless viewed in the disk utility, even then it is greyed out. I need to format it as it has information i need to delete off it, but when i choose erase it comes up with the following error message. "POSIX reports: The operation couldn’t be completed. Cannot allocate memory"
Any ideas? Any help would be greatly appreciated.
Thank you

I know this may be presumptuous of me, but have you tried plugging it in to other ports and or rebooting? Also, try using the First Aid of Disk Utility to repair and or verifying it.
I think there is some issue with Snow Leopard and USB drives. I have a 32 GB USB drive that will not be recognized on my powered USB hub, but will be recognized when plugged directly into my iMac. Yet, that same USB drive will be recognized while plugged into the powered USB hub by Windows 7 while running in virtualization mode.

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Greetings from [email protected],
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