10.6.8 startup disk System Prefs does not route El Capitan

I have a mid 2011 13 "MacBook Pro ("MBP").

It worked 10.6.8

I use SuperDuper to backup bootable external hard drive to the top.

I have the 10.6.8 cloned system and it is bootable from an external Lacie Rugged Triple HD, connected via Firewire.

I installed 10.11.3 on the MBP and it works fine.

I need to boot from the 10.6.8 backup to access some files and that worked fine.

When this 10.6.8 HD is connected via Firewire to the MBP shows up in startup disk options while it is started from 10.11.3

But, now I want to reboot of HD in MBP 10.11.3 can't do running.

When the startup disk is open when running 10.6.8 from the external hard drive the internal drive in the MBP 10.11.3 running does not appear as an option to restart the system.

Y at - there a trick to getting the HD 10.11.3 appears in the startup disk?

If not, if I just stopped the MBP and then remove the external hard drive, the MBP starts its internal HD with 10.11.3, despite the fact that I am not able to select it from the boot disk before you stop? /

Thanks for any help in advance.

This is because in SystemPreferences-> StartupDisk disc is not set how you want to start.

To avoid this kind of situation when the two BONES are connected:

Hold down the Alt (option) key during startup: it will open the "bootmenu": choose the OS disk to use.

Tags: Mac OS & System Software

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