I have a 2 GB SD card for the PRS-500 and a host of Memory Sticks from years Sony cameras. The Memory Sticks are from 16 MB up to 128 MB. However, I don't use them. Since I can put 40 books on the internal memory and still have over 40 MB remaining means that I have no need for the expansion capability. I have a 30 GB Creative Zen that I use for MP3s so the only time I have used the expansion is to review pictures I have taken on the Sony after exchanging the Memory Stick in the camera.
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