I have a 3TB external Seagate drive connected via USB 3.0. I have had it connected to a 2014 Mac Mini for about 6 months. It holds video files for PLEX. The drive has had times where it is connected but not showing up by the Mac Mini. It has also had times where the files don't show up. Now the files are showing up, but they won't play through PLEX. And they will not copy to the Mac Mini drive. I have also tried connecting this drive to my 2013 Macbook Pro. Same results. I have run Disk Utility - Repair Disk. It ran through everything and said the disk was fine. Does anyone have any other suggestions? Mostly what I have are ripped Blu-ray movies that I can rip again, but I do have quite a collection of recorded TV shows. Like an idiot I didn't have it backed up. Thanks for any suggestions!