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Memory Technology Device

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Flash-EEPROM in a Router - real MTD
Not an MTD but a block device

Memory technology devices (MTD) are a new type of device file in Linux for interacting with flash memory. 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.

Do not be confused by USB sticks, MMCs, SDs, CompactFlashes and other popular removable devices. Although they are also called "flash", they are not Memory Technology Devices.[1]

References

  1. ^ http://www.linux-mtd.infradead.org/faq/general.html#L_ext2_mtd
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