USB Mass-storage Device Class
The USB mass storage device class, otherwise known as USB MSC or UMS, is a protocol that allows a Universal Serial Bus (USB) device to become accessible to a host computing device, to enable file transfers between the two. To the host device, the USB device appears similar to an external hard drive, enabling drag-and-drop file transfers.
The USB mass storage device class comprises 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.
Some of the devices that are connected to computers via this standard include:
- external magnetic hard drives
- external optical drives, including CD and DVD reader and writer drives
- portable flash memory devices
- solid-state drives
- adapters bridging between standard flash memory cards and USB connections
- digital cameras
- digital audio players and portable media players
- card readers
- mobile phones
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