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== Overview == MTD --- Memory Technology Devices 目的在于为 Flash ROM, EEPROM 等设备提供一个统一的接口,亦可将一段RAM虚拟成一个MTD 设备 MTD 设备与传统设备的区别: HARD drives MTD device Consists of sectors Consists of eraseblocks Sectors are small (512, 1024 bytes) Eraseblocks are larger (32KB, 128KB) Maintains 2 main operations: read sector and write sector Maintains 3 main operations: read from eraseblock, write to eraseblock, and erase eraseblock Bad sectors are re-mapped and hidden by hardware, at least at modern LBA hard drives Bad eraseblocks are not hidden and should be dealt with in software HDD sectors are devoid of the wear-out property Eraseblocks get worn-out (i.e., bad and unusable) after about 104-105 erase cycles. <br><br>
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