how do i find the storage size taken of X1 DVR recordings currently stored?

hi,

how do i find the storage size of my X1 DVR recordings currently stored?

- for example, let's say my X1 tells me I have 45 programs/movies/shows currently stored, how do I find out how much storage size that takes up?  -- so I know how much of the 150 Gb storage is being used, is being left to use.

Let me know.

Thank you.

John