## Input/Output Device Driver Reference

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### Memory Technology Driver Helpers

The Memory Technology Driver (MTD) Helper routines provide Card Services assistance to MTDs during Read, Write, and Erase operations.

Card Services provides default MTD support. The default SRAM MTD supports Read, Write, and Erase (= write FFh) operations. A non-SRAM default MTD supports Read and Write operations as basic bus cycle byte presentations to the card (with no special algorithms). The Erase operation is not supported by the non-SRAM default MTD.