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Message: <blockquote data-quote="MacInWin" data-source="post: 1831040" data-attributes="member: 396914">You can roll back, but it's pretty painful to do. The upgrade to Mojave changed the format of the internal drive, so you would have to boot from some external source, repartition and format the internal drive back to the El Cap format, then do a restore from TimeMachine, or whatever backup you may have. But I don't think you need to do that. Could it be the cable from the drive to the Mac? The port works, we know, as the USB Stick works. The drive isn't showing anywhere, but it's reacting to the Mac by spinning up, so something is getting through, but maybe not all it needs. Could be a duff cable?</blockquote>