How exactly does "sync" decide what needs to be updated?

Marc Field <[email protected]>
Newsgroups gmane.comp.ipod.ephpod
Message-ID <23113405.1055260155@[192.168.130.190]>
Hi,

I have a question about how the sync routine works:  What exactly does 
Ephpod look at in deciding whether to add a song from the PC to the iPod? 
The reason I ask is that I'm trying to determine whether certain actions on 
my PC will trigger a re-download to the iPod.  The Ephpod documentation 
hints that it looks first at each song in the iTunes database, and then 
looks to match files with the same ID3 tags on the PC, and then downloads 
any unmatched songs on the PC to the iPod.  Is it that simple?  If so, 
which tags does it check?  Or is there more to it (e.g., does it also keep 
a record of all the files it has synced from the PC sync folders, and then 
re-download a file if its name or modification date has changed -- even if 
the ID3 tags are the same, say, because you re-rip the song -- or if you 
move a song to a different directory on the PC)?

Thanks for any help!
Marc

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