i came here specifically to find out about this problem: my PRS 505 worked ok until a week ago when i uploaded 4 or 5 pdfs to my approx 450 titles [mixed in internal memory and a 2Gb SD card]. now it hangs for about half an hour updating the database after i unplug the usb, and it drains the battery much faster.
i guess i'll try and delete the most likely culprits [pdfs] and see if the problem goes away. if not, i will give up on the SD card, and keep fewer titles only on internal memory.
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