I have a backup hard drive that has pictures from our old computer which was a mac. I am trying to move the pictures over to our new computer which is a windows. When plugged into the pc, no external drives appear. I think the problem lies in the fact that when moving files from the mac to the drive the drive must have been formatted for use with only macs. Is there a program that can convert the files on the drive into a format compatible with windows? Or any other suggestions on how to get the pictures off of the external drive. Thanks!