Maxtor D740X-6L 20.0 AT Product Manual page 55

Basic Principles of Operation
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The µProcessor, Disk Controller, and ATA Interface electronics are contained in a
proprietary ASIC developed by Maxtor, as shown below in Figure 5-3.
Block Diagram
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Maxtor D740X-6L 20.0/40.0/60.0/80.0GB AT 5-6