It is fine...
Everybody has told you it is fine. If you aren't going to take our word for it go back to apple and get them to tell you it's fine!!!
Watch my video though in this thread, my write will go to 500MB and then drop to 300 in the same test.
Does yours do that? Watch both videos.
Everybody has told you it is fine. If you aren't going to take our word for it go back to apple and get them to tell you it's fine!!!