High sierra isntall fails - unable to unmount volume for repair

Mac mini 4,1 mid 2010 running sierra with two SSDs arranged as SSD1 and SSD2 for time machine backup. (was a server but now running as a standalone)

Of the various rescue methods the only one that worked was starting in safe mode, ejecting the SSD2 drive and any external drives and running the installer from safe mode

The command line methods either could not find the files or demanded a password, but did not recognise the startup password

Mac mini 2018 or later

Posted on Sep 11, 2022 8:42 AM

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3 replies

BDAqua

Level 10

250,259 points

Sep 11, 2022 11:48 AM in response to vpopovic

Thanks for the tip, it should help some others! :) 👍

vpopovic Author

Level 1

4 points

Sep 11, 2022 12:34 PM in response to BDAqua

Good enough machine running photo capture, processing and archiving with legacy software but needing to interact with company m1 machines via dropbox which is abandoning osx 10.11 and lower!

oh the tech companies just don’t get sustainability. Why throw away good hardware?

BDAqua

Level 10

250,259 points

Sep 11, 2022 1:17 PM in response to vpopovic

Yep it's a shame.:(

Take care my friend! :)

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High sierra isntall fails - unable to unmount volume for repair