I have noticed that when searching for say a tv program I have missed that I can find par2 files but no data. These search results usually contain a hex string such as '7964c9565072eb22dc2c7797ba250e88' but searching for this just returns the par files missing from the initial search. I cannot imagine why someone would only post par2 files!
I realise that in some instances these are posted separately from the data files and you must download both. Downloading books is sometimes a two stage process where the first result returns a numeric string that must be searched for separately.
I welcome some advice