HT1386 Why does iTunes reinstall all my photos every time I sync with my iDevice?

I store over 10000 photos on my ipad and iphone.
It doesn't usually happen, but lately, when I sync with my device via iTunes, it deletes all my photos and resync them back in.
Which dramatically increase my sync time from a few minutes to half an hour.
Does anyone know what might be the cause of it? And most important, how to fix this?
Thanks

Hello clarkkent0117,
You may need to delete the relevant iPod Photo Cache.
iTunes: Understanding the iPod Photo Cache folder
http://support.apple.com/kb/TS1314
Cheers,
Allen

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HT1386 Why does iTunes reinstall all my photos every time I sync with my iDevice?

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