MP4 my space!! Very serious! Online, and other high-~~~~~~

I have mp4's 2G, put a 1.26G things, not the space! I have read all the documents inside the space, that is, 1.26G, but the entire mobile disk space on the show 1.91G ~ ~ do not know why? How to solve ? Should not have hidden files, and so on !!!!! 1 online ~~~~~~ high ~

If your p4 Ipod is not, then try to format or defragment this is normal.You have to buy a 80G hard disk.On a computer display 80G is not 79XXMB but that was the case.

Because the capacity of each algorithm Different.So.Memory card.Or hard disk is not full capacity.In general.The greater the capacity.The more it would cost more ruthless.For instance.500G of a hard disk

actual capacity will be 490G About ..