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Printed Circuit Board

The circuit design of modern drives is characterized by the use of a few highly-integrated chips.

As one can see in the picture, the whole layout is based upon four chips:
    • system controller chip including the read/write channel, disk controller and RISC control processor (microcontroller);
    • Flash ROM chip containing drive firmware;
    • chip controlling the spindle motor and voice coil;
    • ROM chip used as a cache buffer.
Further increase of integration is impossible due to some basic differences in the operational modes of the above functional parts

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