length of time stored vs. how tivo stores video in FSID

[tuzman]

I've noticed a possible trend in my TiVo, and wondering if anyone 
else has had a similar situation. If this has been already covered 
please forgive me :-)

I notice that the longer the video I keep stored on my TiVo, when I 
try to extract the video to my PC via the numerous methods mentioned 
(Extratstream via TivoApp, Sendstream via NC or SMB/NFS, etc.) I get 
a HUGE portion of bad blocks. In fact, when I get down to it, I 
actually find sequences of other shows located in the FSIDs I am 
extracting.

For example, I have the Enterprise episode "Fight or Flight". Quite 
literally, 75% of the show was bad upon extraction. This is also one 
of the videos I have kept the longest on my TiVo. However, with 
newer records, I have little to no bad blocks. 

I think it has something to do with the way TiVo stores shows in 
the "save until I delete" function. 

Anybody have any ideas as to how I can extract the video without the 
corruption? Am I missing something big here?

-Tuz

P.S. Thanks to merch for a great page, your process has worked VERY 
well for me, thanks for the help!