I used a 32gb Sandisk ultra in my MS908P without any issues. As far as space go issues and having to get an SD card to get BMW updates to fit , if it were mine and I was getting close to my update period expiring (2 weeks or so )where I decide I just don't want to chance doing anymore updates so close to expiration , I think I would do a Factory Reset and just download everything with fresh install without the added SD memory installed. Down load one car make at a time Start off with the biggest car make files first downloading BMW first, Mercedes Benz second , VW, GM and so on . Do all the USA , and Asian makes I know I will work on here. Probably hold off on doing huge Renault and Peugeot download unless I still see plenty of room remaining . Might not bother with any Chinese makes I don't see here. Prefer everything I use be kept in one place on one Scan folder , and then create a final software backup to a new Sandisk 32gb USB thumb drive .