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<blockquote data-quote="MacInWin" data-source="post: 1949187" data-attributes="member: 396914">That's not how to do that. It used to be how to do it on an Intel system, but is not the way to do a fresh install on Apple Silicon Macs like yours.Alarm bells going off on that sentence. The Apple Mx Macs are NOT like the Intel machines at all. You may have erased the hidden segment of the internal storage that allows the Mac to boot from external drives at all, or you erased the Recovery system. Either is rather nasty.Sounds like you are booted from it, and it won't let you erase or format it because you are booted from it. See if this has anything helpful:[URL unfurl=&quot;true&quot;]https://eclecticlight.co/2023/02/23/secure-boot-and-disaster-recovery-for-apple-silicon-macs/[/URL]or this:[URL unfurl=&quot;true&quot;]https://eclecticlight.co/2022/07/13/an-illustrated-guide-to-recovery-on-apple-silicon-macs/[/URL]or this:[URL unfurl=&quot;true&quot;]https://eclecticlight.co/2025/02/21/how-external-bootable-disks-work-with-apple-silicon-macs/[/URL]&nbsp;Good luck with it.</blockquote>

[QUOTE="MacInWin, post: 1949187, member: 396914"] That's not how to do that. It used to be how to do it on an Intel system, but is not the way to do a fresh install on Apple Silicon Macs like yours. Alarm bells going off on that sentence. The Apple Mx Macs are NOT like the Intel machines at all. You may have erased the hidden segment of the internal storage that allows the Mac to boot from external drives at all, or you erased the Recovery system. Either is rather nasty. Sounds like you are booted from it, and it won't let you erase or format it because you are booted from it. See if this has anything helpful: [URL unfurl="true"]https://eclecticlight.co/2023/02/23/secure-boot-and-disaster-recovery-for-apple-silicon-macs/[/URL] or this: [URL unfurl="true"]https://eclecticlight.co/2022/07/13/an-illustrated-guide-to-recovery-on-apple-silicon-macs/[/URL] or this: [URL unfurl="true"]https://eclecticlight.co/2025/02/21/how-external-bootable-disks-work-with-apple-silicon-macs/[/URL] Good luck with it. [/QUOTE]

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