well this is no a big problem first format your memorycard in your mobile or pc than formatt your mobile *#7780# 2 time withought memory card then insert formatted memory card withought download anything and open galllery and thenopen memorycard folder... there you see no data.... ok then switch off your mobile then remove memory card and download it.... 10 mb free space switch.... ok then inset memorycard in mobile withought sim and then quick format *#7780# and open quick memorycard folder and play randomly mp3 files and video quickly....and update music library....
done 5000000%%%%%% by me in 15 sets this trick created by me... so plz try it....
regards,
imran87132