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User profile for user: kbpereira
kbpereira Author
User level: Level 1
8 points

OS X Base System is locked?

I was having problems with my iMac, when I decided to clean up abd restore as factory seetings.

Now, I am having a problem which says mt OS X Base System, that the disk is locked. What do I do?


iMac 27″, 10.12

Posted on Mar 17, 2021 3:06 PM

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Question marked as Top-ranking reply
User profile for user: Jack-19
Jack-19
User level: Level 8
46,020 points

Posted on Mar 17, 2021 3:20 PM

Hi kbpereira,


Somehow, you did not erase your disk correctly. Follow these steps:


  1. Once you are in macOS Recovery, verify you are connected to WiFi in the top right corner.
  2. Quit the Installer
  3. Go to Disk Utility.
  4. Select "View" in the toolbar > "Show All Devices".
  5. Select your main hard drive. This will either be "APPLE SSD...", "APPLE HDD...", or "Fusion Drive". It is the non-indented drive.
  6. Click Erase, and input the following exactly:
  7. Name: Macintosh HD
  8. Format: Mac OS Extended (Journaled)
  9. Scheme: GUID Partition Map (if shown)
  10. Click Erase
  11. Quit Disk Utility
  12. Go to the reinstall macOS app.
  13. Follow the prompts, and install on Macintosh HD.


Cheers,


Jack

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Question marked as Top-ranking reply
User profile for user: Jack-19
Jack-19
User level: Level 8
46,020 points

Mar 17, 2021 3:20 PM in response to kbpereira

Hi kbpereira,


Somehow, you did not erase your disk correctly. Follow these steps:


  1. Once you are in macOS Recovery, verify you are connected to WiFi in the top right corner.
  2. Quit the Installer
  3. Go to Disk Utility.
  4. Select "View" in the toolbar > "Show All Devices".
  5. Select your main hard drive. This will either be "APPLE SSD...", "APPLE HDD...", or "Fusion Drive". It is the non-indented drive.
  6. Click Erase, and input the following exactly:
  7. Name: Macintosh HD
  8. Format: Mac OS Extended (Journaled)
  9. Scheme: GUID Partition Map (if shown)
  10. Click Erase
  11. Quit Disk Utility
  12. Go to the reinstall macOS app.
  13. Follow the prompts, and install on Macintosh HD.


Cheers,


Jack

Reply

OS X Base System is locked?

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