Am pretty confident we won't change it on the 4500
The issue on our older models, was it had about 4GB of Free Space, without any apps installed
If a user recorded just 3-4 Hours of Live TV, the box would have 0MB left
Then not work properly and also unable to take updates and users would blame it on the box.
With 64GB you have about 50-60 Hours of Recording to the Internal Storage.