LaCie 5TB Rugged Mobile Hard Drive (Thunderbolt & USB 3.0 Type-C)

It's a great hard drive, it is fast and has lots of storage, however it comes with a back up program that you must install before you can use it and when it is connect that program wants to backup data from your computer onto the hard drive, while it runs it won't allow you to eject the hard drive. If you want to use it just as a portable hard drive to transfer data from one computer to another, you must pause the app on the computer you install it on so that it doesn't remain always connected to the hard drive co that you can disconnect it when you are done. I use the hard drive so that I can transfer work files from work to home so that I can work from home, so the backup program was annoying, but I think I have fixed it by pausing it, so it works normally now.