Your USB what? I am assuming it is an external hard-drive. Am I correct? Also there is no point in not putting the correct error message in your post and not put "something like that"instead. The more information we have the easier it will be to help.
I have just Googled your "pram 2164" error and I get pages of baby carriages. Would you like to post again, this time with a little more care and a bit more detail.