There are m? Are you saying you have files on a flash drive that you need to recover and have tried the flash drive on four different computers and get the "format disk" message? You could try something like Recuva (http://www.piriform.com/recuva) to see if it will retrieve files from the drive. If that fails I'm sure there are other data recovery programs you could try. As a last resort you could try going into disk management (diskmgmt.msc) and assigning the drive a different drive letter and see if that helps.