i think u mean flash drive (flash based storage device, typically about the size of your finger, also referred to as thumb drive - for it's form factor) Flash drives were initially called jump drives, but the name has been changed over time to reflect the type of memory used in the small stick
there is also a pen drive, which is a flash drive that is embedded inside the end of a pen.
copy contents of "flash drive" to local disk. format the flash drive (quick format with FAT file system is fine) copy the contents of the flash drive back to the freshly formatted device. BAM, done.