Hi everyone, Please be patient with me, I'm a bit new to the world of Macs. I have a slightly old Samsung 850 EVO 500GB SSD that I want to use for Time Machine backups. For the last few days, I've had the SSD connected with a USB->SATA cable, just connected to one of the regular USB ports on the back of my new 2017 5K iMac. Time Machine ran fine for the last few days Today, I got an Oyen Digital MiniPro USB 3.1 enclosure. I put the drive in it, and reconnected it. Time Machine backup failed ("could not copy files"). I've tried several Erase operations. I connected the drive to my Windows PC and wiped it clean, including the EFI partition. Basically, when I initialize the drive on the iMac, format it and then instantly run First Aid, it says "keys out of order" amongst other errors messages. Is it possible the enclosure is corrupting something? I have another enclosure of the same type, and it seems to work fine. Please help...this is frustrating. Thanks, Chris --- Post Merged, Jul 20, 2017 --- Going to keep an eye on it, but I switched the drive to a different enclosure and it worked fine. Hmmm...going to call Oyen Digital tomorrow and tell them I suspect one of the enclosures I ordered is bad somehow.