How to salvage an unreadable usb flash drive

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http://unix.stackexchange.com – I have a 16GB USB flash drive that somehow got corrupted to the point in which even fdisk -l can't find it (I get a one-line error message saying: "Unable to open /dev/sdc") However, it is being attached, being assigned /dev/sdc as dmesg shows: usb 1-7: new high speed USB device using ehci_hcd and address 69 usb 1-7: New USB device found, idVendor=048d, idProduct=1167 usb 1-7: New USB device strings: Mfr=0, Product=0, SerialNumber=0 usb 1-7: configuration #1 chosen from 1 choice scsi68 : SCSI emulation for USB Mass Storage devices usb-storage: device found at 69 usb-storage: waiting for devi (HowTos)