Memory Technology Device
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Memory technology devices (MTD) are a new type of device file in Linux for interacting with flash memory, similar to Flash Translation Layer. The MTD subsystem was created to provide an abstraction layer between the hardware-specific device drivers and higher-level applications. Although character and block device files already existed, their semantics don't map well to the way that flash memory devices operate.
USB sticks, MMCs, SDs, CompactFlashes and other popular removable devices should not be confused with MTDs. Although they are also called "flash", they are not Memory Technology Devices.[1]
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