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koden

macrumors member
Original poster
Feb 13, 2016
61
5
I have this imac.
I have removed standard 1 TB disk and put in a SSD disk.

First I installed win 10 on it because MAC OS stop in installation.
Thats why you see some EFI in picture

Then Ibooted on a high sierra USB (command+R) and deleted disks and partioned with journaled.

But when installing high sierra it says my disk is locked.

I open terminal and run diskutil list and get what you see in picture.
Why all thoose disks??

How do I completly delete all so that I just have a disk and the USB installer shown?

20200216_174550.jpg
 
Those are mostly disk images. No idea why they are there but they are not part of your SSD (/dev/disk0).
your installer also appears at /dev/disk8 which is good and normal.
what you want to do is boot off the USB (option key at boot) the use DiskUtility to repartition the drive. Then the installer should work.
 
Those are all virtual RAM disks created by the installer and can be ignored. They will disappear when you reboot.

You need to option key boot to your USB installer, not command-r boot.

Once you are booted to the USB key, start DiskUtil then check show all devices and select the drive itself at the very top like in my screenshot.

Now click Erase and wipe the drive to macOS extended journaled. Then quit DiskUtil and install the OS.

This will wipe your data of course.
 

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Yes thanks... :)

Then there is only the locked disk problem back
[automerge]1581874959[/automerge]
I have 2 top disks in diskutil

no name
and
the OS X base system

and lower my High sierra USB

no name is a little 16 MB
And OS X base system is my SSD ???

No idea how it got that :)
Anyway when trying install high sierra on SSD (OSbase) it says it locked.
 
Last edited:
File, in the menu bar. By the look of the screenshot, you are not booting off USB yet. It is critical that you are boot off the USB and not internal.
 
ahhh... what a fool I am..
Sorry

Booted with command+R
Now done with just ALT
Choose USB installer.

I choose disk utility
Delete top disk
No problem.
Connect to wifi
Go back to installer window
Click install MAC OS

I get this back:

This installer of high sierra is destroyed and can't be used install MAC OS

I have read before that USB can be broken, but maybe high sierra is to new for this old machine.
Maybe I have to install LION or some old OS first.

I have used USB before on my other MAC to install High Sierra.
 
Booted with command+R
I posted what you need to do up in post #4. You need to option key boot to the USB key top be able to erase the entire drive.

A command-r boot is still booted to the recovery partition on the internal drive and you cannot format the drive while you are booted to it.
 
I posted what you need to do up in post #4. You need to option key boot to the USB key top be able to erase the entire drive.

A command-r boot is still booted to the recovery partition on the internal drive and you cannot format the drive while you are booted to it.


Yes you did. I just read to fast and did'nt see it :)

But thanks... :)
 
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