Microsoft really needs to fix this mess... On my 920, I had 6GB consumed while only have 1GB in App Data and 1.5GB of Music. No device should use 6GB in "Cache".. This is clearly going to be a major problem for people who have 8GB of storage on their devices.. iOS, Android, BB, MeeGo etc are all able to handle cache without it consuming a majority of the devices memory.. This is clearly poor coding that Microsoft needs to sort out asap.