USB mass storage device class

[technoguy]

The USB mass storage device class (umass) is a set of computing communications protocols defined by the USB Implementers Forum that run on the Universal Serial Bus. The standard provides an interface to a variety of storage devices

[vipl]

Many USB devices, from digital cameras to disk-on-key units, provide "mass storage" capabilities, which allow you to use them just like a file system on a hard disk.

[alan_jader]

To cleanup duplicate files in your memory stick, use this solution

http://www.dublicatefilesdeleter.com/