GEN 7 HDD navigation map update (via USB)

[Octogenarian]

I know it is quite a rare setup as it is relevant to a relatively limited number of Lexus cars but I was still hoping that someone might have a solution or at least could provide me with some additional info.

I am an owner of a RX350 (mid 2012 -2015 model version) that comes with a 7th GEN navigation system based on HDD. It is updated via maps on a USB stick and requires a License Key input. 

I know how to get the key, however, I was wondering how to get the maps. I have a feeling that potentially the map files of GEN 7 and previous WHEREIS DVD operated systems look the same. 

I was just wondering if anyone knows if the DVD content can be put on a USB stick (and in what folder structure etc) and used in a GEN 7 navigation update. Any additional details on this situation will be appreciated.

 

Cheers