Hello! I have a problem with my memory stick ( flash drive). It has a memory of 2GB and I have copied some files on it, representing 20% of its size. Now when I want to use this device I receive a notification that the stick needs to be formatted. If I try to do this, another warning says that all the files on the stick will be deleted. Another thing is that when I check the properties of the stick I am told that it is full, which , of course, is not true. Can you help me with hese problems? Thanks.