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os install from flashdrive

  1. W

    Late 2015 iMac HDD replacement 17,1

    My HDD went out on my (late 2015) iMac so I'm looking at a OWC Mercury Extreme Pro 6G Professional grade SSD, its formatted for Macs, has anyone installed one? I'm getting the 2tb Also any advice on putting the OS on a flash drive to install should I install Catalina or Mojave?