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The first thing I did was put six copies of the same book, Clive Barker's Books of Blood Volume 1 on my eReader and test the speed change between DOC, HTM, PDF, RGO, RTF, TXT, and a LIT copy of BoB2. I also tested some Brad Thor books that were of different sizes, 200K, 550K, 780K, and 1.1MB, all in LIT format. It seems that size has little impact. A book by Clive Barker in 700K took significantly shorter time than a book within 40K by Thor.
The format issues do seem to make a difference. I'm ordering a class 6 16GB to use for this and my digital camera, I want to see if having a faster Class card makes a difference.
Class 2, Class 4 and Class 6 - transfer data at least 2, 4 and 6MB per second. There are class 10 cards out there but it would be a a bit of overkill for an eReader. You would use Class 10 for a camcorder. Class 10 runs at a max of 22MB/sec, and a minimum of roughly 12MB.
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