Is there a significant performance penalty for opening files on the SD card?

For instance, if you try to play a movie by opening 1000 PNG files in a 
directory on the sd card, is this way worse than having them all 
concatenated in one file?

My (probably flawed analysis) is this:

Since the SD card is not a hard drive, the 10ms or so seek penalty is not 
there.  So, there probably isn't much difference.

Anyone have any other views?  

FYI, I'm basically working on a hi-res loss-less movie player.

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