I have a external drive hooked up to my Windows PC to back up all my music, but I get most of my music off of my MacBook. I know they usually don't play well together, but I haven't had a problem in three years or so. The music I have been gathering is .mp3 but now it won't transfer over when I try to switch it from laptop to PC by plugging in the hard drive into each. I also tried to use Google Drive to transfer them and they still don't want to go, which leads me to think it's the music and not the drive. What do you guys think?