Question about watching a One Pass show and then deleting it.

In my experience, it does not usually re-record episodes you've already recorded and deleted. But it does occasionally mess up.

 

Yes.
After a period of time.

 

I've only recently come back to Tivo, but my impression of both TIVO and WMC was that they did some how keep track of episodes recorded. I've been recording Anthony B's "Parts Unknown" on CNN and haven't notice a lot of duplicates, but it's a bit hard for me to tell because I had recorded some using WMC. Also, CNN is rather bad at indicating which episode is shown, which further complicates it.

 

To elaborate, there is a "28 day rule". If an episode is either scheduled to to record within 28 days or was recorded within 28 days, then other airings of the episode will not be recorded. Also, if an episode is in the NPL (now playing list), it won't be recorded again regardless of time.

This prevents an episode from being recorded multiple times in the same week. It doesn't prevent it from being recorded again when the network cycles back to the beginning of the series a few months later.

 

If the episode info is generic, it is probable that you will get multiple recordings of the same episodes. Check out the upcoming episodes of the program and see what the descriptions show.