On my Tomtom, on an inserted sd-card, I had a full map of Europe with buildings installed. But because of the bigger download size and because it didn't have any additional value to me, I decided to change the map to full Europe without building. All well, until a next map update... I wondered why the download took so long and it kept on going way beyond the 7 or so Gb's. And then I saw when the downloading was finished a total of around 16Gb's where downloaded and cached, so obviously now the two maps are downloaded instead of one. And there is only one installed on my system, that I can assure.
So I wrote Tomtom support but they don't seem very good at actually reading the question so my issue wasn't resolved and closed by them, and it seems there is no more support for the 5100 so I can't open a new issue, instead I am send to this forum, even though the issue has nothing to do with the device I have but with the update system.
Anyway, is there anyone who can help to solve the problem?