Boot from external hd drive

[heisenberg123]

I got a Early 2015 13" rMBP I found my old hard drive from my Early 2011 MBP I was curious how OS X 10.7 would feel on a new MBP but I get a grey screen with an line through a circle

in system preferences its recognizes it as a startup disc and in disk utility it still says its GUID partition table and the drives shows nothing wrong with it

any suggestions?

 

[jermy4]

I'm pretty sure you can't run any OS X versions older than what your machine shipped with when it was first introduced so you wouldn't be able to use anything older than Yosemite on a 2015 rMBP.

 

[heisenberg123]

thanks that does ring a bell now that I read your reply remember reading that in 2011 when I first got a mac

 

[jermy4]

They also aren't including support for older versions of Windows via bootcamp on new machine either now. I think the 2015 models can only run Windows 8 or 10, the 7 drivers are missing in action.

 

[heisenberg123]

thanks Windows make me ill and will never go back especially Windows 8

 

[Fishrrman]

You can't boot a 2015 MBPro using 10.7.
Won't work.
That's why you're seeing what you're seeing (the "prohibited" sign), when you try to boot that way.

 

[snaky69]

I'm pretty sure you can't run any OS X versions older than what your machine shipped with when it was first introduced so you wouldn't be able to use anything older than Yosemite on a 2015 rMBP.

That is exactly it.

10.7 just doesn't have the correct drivers to support your hardware. Which makes sense, back when 10.7 was around your hardware was still an electronics engineer's wet dream.