Can’t reinstall MacOs because disk is locked (2nd hand MacBook)

"S W

@avanteguarde


Rep: 46.7k




7


55


91"

"Try this:

Restart , Hold down CTRL+OPTN+R

it should get into internet recovery, Circling globe and it will end up in disk utility page.

Click on disk utility and erase the hdd from internal only once done go back and go to reinstall Osx sierra."

"I also had an issue with a locked disc when I was in recovery mode.

I ended up installing High Serria on a thumb drive, rebooting the mac holding down command, and selected the thumb drive to boot from. From there I was able to erase the mac's hard drive with JOURNALED selected. Exit disc utility and installed High Serria. It's installing now. I'll message again if there are any problems."

I have a similar problem, the drive is locked, I can unlock it and run first aid but when I reboot drive is locked again.

"1.) Open the terminal from the reset mode.

2.) Type this command in: diskutil list and hit enter.

3.) If there are no errors, type this command: diskutil unmount force /dev/disk0s2 and hit enter

4.) You will now be able to look at all of the actions through Disk Repair (erase/partition)

5.) Select Partition and create a new partition (select OSX Journaled)

6.) Hit continue and if it works then you can go to download your operating system and your disk will see two disks. Select the disk that is no longer locked."