Unlike portable GPS units, the DN-W58 stores map data on an internal 30GB or 40GB HDD. The DVD you insert is not the live operating disk; rather, it is an that copies (or overwrites) the map data onto the car’s hard drive.
to function; without this disk, the unit often locks or displays an "Insert Correct Map Disc" error, especially after a battery disconnection Software Download & Availability Nddn-w58 Toyota Map Disk Software Download
: Fix screens that prevent rearview camera displays due to the "insert disc" error. How to Download and Create a Map Disk Unlike portable GPS units, the DN-W58 stores map
Updating your Toyota map disk software regularly is crucial for several reasons: Unlike portable GPS units