I have been using the 4GB SD card that I have and the boot speed doesn't seem to be a problem. I don't yet have 2 GB of data in the main memory and the SD card combined so maybe that will slow things down when I get there. The SD card does offer the ability to archive reading material off the Reader though. That might be useful if there is something that you want to keep personal too since there doesn't seem to be any security. Archiving can be done with a CD or DVD too if your PC supports a CD and/or DVD writer
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