: A built-in HDD capable of storing thousands of audio files.
While the specific HRZ099 manual doesn't exist in English, this unit is part of a hardware family. Mechanically, it is nearly identical to the and shares DNA with the AVIC-HRZ88 .
This feature bridges the gap between pure navigation and entertainment, an advanced option for its time that would justify a premium “HRZ” (High Resolution) model.