Memory Technology Device
Memory Technology Device ( MTD ) is a subsystem under Linux , which serves as an abstraction layer for access to the memory of a Linux system.
MTD offers a unified interface for memory modules that mediate between the various hardware-specific device drivers and the upper layers of a system. MTD is primarily used for flash memory . One advantage of MTD is that the users of this abstraction layer do not need to have any knowledge of the internals of the layers below (e.g. which file system: FTL , FFS2 ). Furthermore, the same API can continue to be used from these upper levels when changing the flash memory .
MTD is different from the device drivers for USB , MMC or SD cards . For the latter, block devices are used, which regulate the physical data access internally, while MTD is intended for raw formats of flash memories.