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How are you putting the books on your SD card? If you are simply coping them via a usb connection (eg _NOT_ using the Sony software) in addition to loading the file on the Reader the Reader also must parse the file and format it for the various font sizes. These operations are, apparently, quite cpu and therefore power intensive. If you use the Sony software this parsing and at least some of the formatting is done on the PC and the results are simply stored in the database on the Reader. What is worse it seems as if the formatting information is lost if it is done by the Reader with any change in the file structure on the SD. Which is not say that some SDs may be more power hungry than others.
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