Boot from thumb drive new MacBook Pro?

[calliex]

Can you boot the new MacBook Pro from a usbA thumb drive using a usb C adapter.?
I always make a bootable thumb drive with the mac OS on it. I have one for sierra, high sierra and Mojave but the are on USBa thumb drives. A friend of mind is buying a new MacBook Pro 13 today and may want to run Sierra on it because of old software. I thought we could boot from my thumb drive but wondered what would happen using an adapter. I am going to see him later today and trying to anticipate problems.

joe

 

[chrfr]

Can you boot the new MacBook Pro from a usbA thumb drive using a usb C adapter.?
I always make a bootable thumb drive with the mac OS on it. I have one for sierra, high sierra and Mojave but the are on USBa thumb drives. A friend of mind is buying a new MacBook Pro 13 today and may want to run Sierra on it because of old software. I thought we could boot from my thumb drive but wondered what would happen using an adapter. I am going to see him later today and trying to anticipate problems.

joe

You cannot run Sierra on a 2018 MacBook Pro. You can use a USB drive to boot Mojave or the appropriate version of High Sierra, however. To boot from an external drive it’s necessary to allow the setting for that in the recovery partition. By default the new Macs can only boot from the internal disk.

 

[calliex]

You cannot run Sierra on a 2018 MacBook Pro. You can use a USB drive to boot Mojave or the appropriate version of High Sierra, however. To boot from an external drive it’s necessary to allow the setting for that in the recovery partition. By default the new Macs can only boot from the internal disk.

Thanks You for the info. His 2012 MBP died today. He is a researcher and went out and bought a new one. He thinks he may have software that will not run on Mojave. We deal with it if and when it comes up.

 

[CoastalOR]

Can you boot the new MacBook Pro from a usbA thumb drive using a usb C adapter.?
I always make a bootable thumb drive with the mac OS on it. I have one for sierra, high sierra and Mojave but the are on USBa thumb drives. A friend of mind is buying a new MacBook Pro 13 today and may want to run Sierra on it because of old software. I thought we could boot from my thumb drive but wondered what would happen using an adapter. I am going to see him later today and trying to anticipate problems.
joe

The 2018 MBP has the T2 chip in it and it will not allow booting from an external source (including a thumb drive) until the Secure Boot settings are modified:
https://support.apple.com/en-us/HT208330

 

[calliex]

The 2018 MBP has the T2 chip in it and it will not allow booting from an external source (including a thumb drive) until the Secure Boot settings are modified:
https://support.apple.com/en-us/HT208330

Thanks did not know that

 

[Ploki]

after you do that however, it works fine