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Apple Computing Products:
macOS - Operating System
imac keeps crashing, rebooting?
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<blockquote data-quote="MacInWin" data-source="post: 1845795" data-attributes="member: 396914"><p>Just to be sure, the version of OS on the external is the same as the version on the internal? DU is updated with the OS, so you need the same DU as the internal. Particularly with APFS changes at Mojave/Catalina. If that is the case, the drive is dead/dying and chscag's advice is about al you can do. Backup what you can, replace the drive. You could do a backup, boot from an external installer, try formatting the entire drive and then creating the APFS container and reinstalling from scratch. Test the drive again and if the error are corrected, do another reinstall and use Migration Assistant at the first boot to get your system back like it is now.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1845795, member: 396914"] Just to be sure, the version of OS on the external is the same as the version on the internal? DU is updated with the OS, so you need the same DU as the internal. Particularly with APFS changes at Mojave/Catalina. If that is the case, the drive is dead/dying and chscag's advice is about al you can do. Backup what you can, replace the drive. You could do a backup, boot from an external installer, try formatting the entire drive and then creating the APFS container and reinstalling from scratch. Test the drive again and if the error are corrected, do another reinstall and use Migration Assistant at the first boot to get your system back like it is now. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
imac keeps crashing, rebooting?
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