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Will the UltraBlock's HPA/DCO support alter the hard disk permanently?

The commands needed to override HPA can be used in a "volatile" mode, so the changes are temporary and the hard disk will be returned to its original state after it is power-cycled.

The commands needed to override DCO are permanent, so they will be retained even after the hard disk is power-cycled. For this reason, an UltraBlock will never send DCO commands to a hard disk except under the explicit control of the user.

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