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tbh, I haven't done alot of blu ray rips ... only some light testing. 59% would seem plenty and with decent opts 25 - 27% should look awfully nice going to the atv's 720p. Cave, I believe you've done more testing than me 😉
 
I'd say stick with the scenes standard of 8GB 1080P's. Hard drives are cheap anyways, $130 for 1.5TB drive- enough for about 192 films @ 8GB.
 
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