First, you use inadequate terminology. These are not two hard disks, one device is connected with two storage memories. The word for it is drive. It's actually flash memory, two chips, or one logically divided. You see what and access what your device allows. There is nothing funny about that.
It's the exactly same story as when you plug a cell phone into a computer.
New devices...it’s not the same story as before. No more navcore.
New devices have firmware. It houses all low level functions, defines its behavior and houses the complete operating system. And it is with them that the story is identical to that of mobile phones.
In fact, its complete operating system is based on Android with major modifications. TomTom has not published its contents anywhere.
The only thing you can do is contact their technical support.
Or, if it's still under warranty, send it directly.
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