I made a boneheaded mistake while erasing my hard drive (can’t tell you what that mistake was) and now I can’t reinstall macOS! Can someone tell me what I need to do so I can free up the hard drive and correctly reinstall the new copy of macOS?

I’d appreciate any advice and guidance. I’ve posted the pictures to provide details.

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  • An added note is that I can not select the erase button in disk Utility. It is grayed out along with the restore and unmount selections. The memory on APPLE HDD, which is the SATA internal physical Disk is completely taken up by OS X Base system. I’d like to know how can I reinstall macOS, in this case? Any suggestions?
    – Amber Khan
    Commented Apr 5, 2018 at 13:00

1 Answer 1

  1. Boot to Internet Recovery Mode (shiftaltcmdR)
  2. Open Disk Utility and erase your internal disk
  3. Install macOS (the macOS that came with your Mac, or the version closest to it that is still available will be installed).
  4. After rebooting and configuring your system download and install macOS Sierra.
  • I appreciate your response however I cannot select erase. It won’t allow me to... “erase” is grayed out. What can I do to free up the memory?
    – Amber Khan
    Commented Apr 5, 2018 at 12:49
  • Perhaps I misunderstood the steps that you suggested. The iMac automatically loads up to internet recovery mode. I think I saw a previous posting when you helped someone with this sort of problem. But I’m not sure what to do in Terminal to restore memory.
    – Amber Khan
    Commented Apr 5, 2018 at 13:12
  • @AmberKhan If disk0s2 with 1.9 billion 512-blocks is mounted to / (screenshot2-line3), you aren't booting to Internet Recovery Mode.
    – klanomath
    Commented Apr 5, 2018 at 15:18
  • ok i see...I erase Apple HDD correct?? And not the OS X Base system? This might be a silly question but it looks like I have two internal hard drives. Thank you
    – Amber Khan
    Commented Apr 6, 2018 at 16:39
  • Booted to Internet Recovery Mode you will have two OS X Base systems: one (~1 TB) falsely installed/moved? to your internal disk and the second proper one "d/led" from Apple (~2 GB). You have to erase the internal disk.
    – klanomath
    Commented Apr 6, 2018 at 16:43

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