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A movie is pretty descent quality from about 115MB and up, but of course, the more memory you use, the better it is. For me, 180MB is just about perfect, because it leaves 60 or so MB free on my 256MB SD card for MP3s.
Compact flash is faster than Secure digital; I don't know about microdrives. I would assume that they have to spin for a while before they can read. At any rate, I don't notice any difference in speed from opening an MP3 from my 32MB CF card or my 256MB SD card. Then again, the CF card is 3 years old and the SD card is brand new :wink: . My SD card handles movies fine, opening a 180MB movie, almost 2 hours, in maybe 5 seconds. So while CF is faster, I don't think it makes too much of a difference for movies.
As for a couple of movies, I would recommend at least a 256MB CF card, probably 512MB. CF is less expensive than SD.
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