The PS3, the stop button and resuming play

[damnspynovels]

So I have a PS3 and a handful of movie discs.

I've noticed that annoyingly the stop button on the remote will kill the disc back to the PS3 menu interface. And restarting the movie will result in having to go through all the previews etc.

However, I ejected disc one of Robin Hood in the middle of the first episode, and when I put it back in, and selected the disc from the video menu, it returned to the exact point I was playing before I ejected it.

What's the policy for resuming play then? Is it something that depends on the kind of disc you're playing?