## Input/Output Device Driver Reference

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### Media Access Routines

The media access routines are the common worker routines used by MTDs to perform the low-level primitive functions underlying the basic Read, Write, and Erase operations.

Card Services builds the Media Access Table (MAT) using the Socket Services function GetAccessOffsets for register-based sockets. If Socket Services does not support the function, the MAT is provided by Card Services itself.

All pointers in the MAT consist of Selector:Offset (16:16), level 0, GDT addresses.