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USB mass storage device class (in English: USB mass storage device class, also known as USB MSC or UMS) is a protocol that allows a device with a USB interface to be connected to the main computing device to transfer files between them. For the main computing device, the USB device looks like a mobile hard disk, allowing drag and drop file transfer. In fact, it is a summary of many communication protocols adopted by the USB Implementer Forum, which provides interfaces for many devices. Including mobile hard disk, flash disk, mobile optical drive, card reader, digital camera, digital music player, PDA, mobile phone, etc.