You can see how much space is available on your Apple TV's hard drive right from your Screen Manager in Playlister. Apple TVs come with either 32 or 64 GB of storage, just click on a screen to see how much storage space is available:
If one of your Apple TV's is low on storage, a warning label will appear on the screen in your Screen Manager. Here's what each of the storage labels means:
The "Storage Low" label shows up when there is still a bit of available space left on your Apple TV. This label appears to let you know that the Apple TV is nearly full and you should probably clear off some playlists by unscheduling them.
The "Storage Full" label appears once there is no space left on your Apple TV's hard drive. This means that the Apple TV will no longer be able to sync playlists and you will need to unschedule some of them.