I was previously using the kingston 4gb usb flash for eboostr, it was working perfectly.

Then I decided to plug a camera flash into an external usb flash reader, the kingston flash stopped working the instant i plugged external usb reader in (error: one of the usb storage has mulfunctioned). And the kingston flash worked again when i pulled out the external flash reader. Tried this serveral times even after computer restart, problem is not fixed. This problem occured before i even tried to use the external card for eboostr.