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

Problems formatting MacOS Catalina

Hi, I am formatting my Mac due to upgrading to a new mac.


its a Macbook Pro 2015 with MacOs Catalina. I was following this apple post


https://support.apple.com/en-us/HT208496


my mac had 2 internal drives, Macintosh HD and Macintosh HD Data. I was not connected to the Wifi when I did this. I went into recovery mode (Command + R) , disk utility, selected Macintosh HD and as the tutorial says I selected to Erase Group. It went ahead and erased one of the HDs but not the other.


it gave me the error


The volume Macintosh HD couldn´t be unmounted because it is in use by process 708 (it was a slight different process before) (kextcache)

Couldn't be unmounted disk: (-69888)


Im stuck and don't know how to go forward, I tried to re-install the OS but it tells me its an incomplete system.


can someone help me?


thank you

MacBook Pro 15″, macOS 10.15

Posted on Jul 13, 2020 12:13 AM

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

Posted on Jul 15, 2020 10:12 PM

I actually found the answer. I googled the problem "the target volume is part of an incomplete system" and found that I didnt format the parent drive, because I had not selected >Disk Utility>View>Show All Devices. Found it here https://discussions.apple.com/thread/250872009


so after formatting the whole drive correctly I could re-instal the OS and now is working.


thank you

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

Jul 15, 2020 10:12 PM in response to Moreplavec

I actually found the answer. I googled the problem "the target volume is part of an incomplete system" and found that I didnt format the parent drive, because I had not selected >Disk Utility>View>Show All Devices. Found it here https://discussions.apple.com/thread/250872009


so after formatting the whole drive correctly I could re-instal the OS and now is working.


thank you

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Problems formatting MacOS Catalina

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