[Q] Internal SD Card

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http://forum.xda-developers.com – hey guys , i have a problem here about my internal SD card can you tell me how to clean my internal SD card without delete any system which is running i already put my titanium backup folder , video , music , and SMS on my PC and maybe this is dumb question , but please tell me the answer "CAN I DELETE all FOLDER in my internal SD CARD ? " if no , which folder must i keep ? (HowTos)