Dual boot with 2 BigSur installed on internal ssd

[alpez]

Hi

I wonder if anyone done that on their m1 ?

- Split the ssd into 2 partitions
- Install 11.1 on each partition
- Why, so my work and private os is sepparated (like I have it on my Intel mac)

I made a try with my old m1, but diskutil f*cked up the ssd, (it got twice the size so apple sent me a new m1 mac (bricked !)

The old m1 external ssd I installed 11.0.1 on wont boot on the new m1 (yes boot options are set to allow external boot)

Im damn careful now, the firmware/boot/etc seem to be very different from Intel macs ...

Your macos Admin user and password seem to be stored in the firmware.
That why im asking so i dont f*ck up everything when installing bigsur on the other partition ... overwriting the other partitions user/pw !

Or anyone got a clue how bootsystem works on m1 firmware

/Alexis

 

[grahamwright1]

Guide to Startup Modes on M1 Macs:

A Guide to Startup Modes for Intel and M1 Macs

From Startup Manager to Internet Recovery on Intel Macs, and how to engage each of those in an M1 Mac. With comprehensive diagrams.

eclecticlight.co

Also take a look at:

Big Sur boot volume layout

Detailed account of disk, volume and folder layouts on Big Sur’s boot disks, complete with roadmaps which are downloadable as PDFs.

eclecticlight.co

There are a number of other very interesting articles on that site about the new M1's you should take a read through.

 

[alpez]

Thanks

I will ask him !

/A