Can this be used for dual booting?

[dancojocaru2000]

On the internal SSD of my 2012 MacBook Air, I have macOS Mojave installed. I would like to keep that installation intact and only occasionally use Big Sur by booting off an external SSD.

Is it possible to install Big Sur on the external SSD using this method? Will my main Mojave installation be affected?

[Danzel-599]

Will my main Mojave installation be affected?

No way! No worries

Is it possible to install Big Sur on the external SSD using this method?

Of course! Be careful!

1. Are you already using APFS or using HFS+ ? This is important!
2. You have to format disk to APFS scheme (GUID)
   
3. At least you must have more than 60GB+ SPACE on AFPS Container
4. Just choose the external SSD

[dancojocaru2000]

I would assume this configuration is correct?

[Danzel-599]

I would assume this configuration is correct?

Nice one!

[dancojocaru2000]

Thank you!

While I'm here, I would assume that if I pair a Bluetooth device with one OS, it will be unpaired with the other, even if they're both macOS, right?

[Danzel-599]

Thank you!

While I'm here, I would assume that if I pair a Bluetooth device with one OS, it will be unpaired with the other, even if they're both macOS, right?

I don't think so..

[dancojocaru2000]

I'm asking since on my Lenovo laptop where I dual boot Windows 10 and Ubuntu, if I pair a device on one OS, it forgets about the other OS. So if I connect my Bluetooth mouse to Windows and then to Ubuntu, Windows still sees it as paired but the connection isn't made when I turn the mouse on.

Regardless, I'll see for myself after the install. Thank you for your help!

[Danzel-599]

I'm asking since on my Lenovo laptop where I dual boot Windows 10 and Ubuntu, if I pair a device on one OS, it forgets about the other OS. So if I connect my Bluetooth mouse to Windows and then to Ubuntu, Windows still sees it as paired but the connection isn't made when I turn the mouse on.

Regardless, I'll see for myself after the install. Thank you for your help!

You're welcome! @dancojocaru2000

Regards!