With MTS tv you can upgrade you pvr to one that has a bigger hard drive.
All boxes come with a 160GB hard drive.
Which allows you to record 30-35 hours of HD programing.
The upgraded box has 500GB hard drive which is over 100 hours of HD programs.
MTS does charge a $50 per household fee to upgrade all boxes in your house.
I upgraded over the summer.
Check out link for more info
https://www.mts.ca/residential/tv/features/whole-home-pvr