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Macintosh HD show up as external

Hey

I have a 1TB SSD drive I purchased at the owc

The detailed model is shown in the picture:

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I had some problems lately with the performance of the computer and it made me decide that I wanted to reformat and do a clean installation of the operating system and then do a restore from the time machine

When I got to the stage of deleting the drive I kept getting this error:

"failed to unmount drive"

And this actually brings me to a situation where I can not format the drive.

I also tried through the terminal all sorts of orders to make it work but without success.

What to do ?

Are you booted into the Recovery Partition?

See mount section in 1st linked article.

Disk Unmount Using Terminal

Disk Unmount Using Terminal (2)

Disk unmount

最後更新：2017-10-12 00:12:09

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