I have 8 gb flash drive but the problem is that when i copy the data in my usb flash drive like 2 gb data and i plug out the usb flash drive when i again insert usb flash drive in usb and there is no data in usb flash drive but space is still used 2 gb i checked the folder option all visible file option Dos attrib option all tricks i do that but still no solve problem so please any one help me..
Have you tried to disconnect it?
If there is no difference, your drive may be damaged for your improper operation or vicious virus attack, or something else, such as not safely ejecting this drive.
Now, for the 2GB data, you should try a USB flash drive recovery freeware that can do its utmost to recover all your data back just in the same way as it has retrieved the data of my friend completely. If you are curious, you could visit there: http://blog4mark.blogspot.com/2012/11/how-to-repair-cor...
In the future, you should learn to back up your data at least on two different drives.