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I got the Samsung T5 SSD 2TB for my Mac Pro tower. At first it was fine. They, every few days it would randomly start "disconnecting" or "ejecting" while copying files. The problem is that it would not mount after that. This required reformatting the drive each time. Disk Utility along with Disk Warrior both report "hardware failure" issues. But those warnings to away once the drive is reformatted (extended, journaled) again. Then, a few days later, it would eject while copying and not mount again - thus requiring another reformat and erasing everything on the drive. I'm using Mavericks (not High Sierra). I reformat and she works again... until the next time...