hard Drive Preloaded with MacOS high Sierra for Unsupported Apple Mac Pro 3.1, 4.1, and MacBook Please See Pictures The price is $125 The 1TeraByte Hard Drive allows you to run macOS High Sierra on unsupported Mac Pro and MacBook Pro. Its preloaded with MacOS high Sierra and lots of software. Its a Plug-n-Play no software installation. Requires no extra steps to install. All you have to do is1- Install the hard drive 2- Start your Mac, Thats it. Carbon Copy Cloner is installed on the hard drive for an easy method of backing up or storing these images on other drives. You can clone this Mac OS X version to a bigger hard drive or SSD that you already own. If you have Mac Pro 3,1 or 4,1 you can enjoy the latest macOS High Sierra without spending thousands of dollars to replace your machine.This MacOS system is tested and work without issues. With this modificationmodernization you can enjoy many more years with your current Mac. The Hard Drive Is1 TeraByte SATA300 10K RPM 16 Mb General Features 1Tera Byte storage capacity SATA interface. Please email or text 727 - 85 one - six seven 80 I Always respond to all messages if you didnt hear from me please check your spam folder.