According to Wikipedia, the 2017 HD Stick (3800X) continue to have 256MB flash for channel storage, just like the 2016 HD Stick (3600X). There's no micro SD slot, so no way to expand storage.
In contrast the 4K Stick+ (3810X), and all the boxes with micro SD slot (ironically), come with 512MB or more.
With a family account having 50+ channels (no games), I'm noticing that the HD Sticks are frequently reloading anything but the few most recently used channels. That's too bad, as the 4K Stick+ doesn't seem to have that problem.
Are channels getting bigger these days with SceneGraph or NDK?
Is there a secret screen that shows the size of each channel?