Installation 10.11.6 El Capitan with 10.6.8 Snow Leopard on old Mac Pro 4.2 multiboot?

Looking for savvy here advice...  I have an old Mac Pro 4.2 (cheese grater) that runs Snow Leopard 10.6.8.  It is a wonderful workhorse machine, who served me tirelessly for many years.  It is obviously older and slower, but works very well.  I love 10.6.8.  If Apple ever updated the Mac Pro line (I know, probably not... sigh...), I'll buy one and replace this machine.  Until then, I keep doing this work.

This machine is a beast, has been upgraded with internal hard drives 1 TB three (he also got a couple internal HDs inherited from 750 and 500 MB used for storage).  I have also several external 1-4 to, hip, FW800 drives too.  A host of storage, of course, and should be a lot of options to start on several systems.

I am generally satisfied with 10.6.8 on this machine, although there are obvious limits to that.  I would get one or two operating systems newer on it, pick-and-choose between them according to the needs, but I absolutely want to/need to preserve the ability to initiate and run 10.6.8 systematically as my operating system on the day the day, at least for now.  Maybe I'll warm to one of the others on this machine eventually, but 10.6.8 must remain usable, install a newer OS on other readers may not nerve there.

On a year-and-a-half ago, I took a race to install 10.10.3 Yosemite on one of the internal disks.  This doesn't quite work.  I moved, sniffed Yosemite everywhere, don't really like it a lot and went to restart and him switch back to 10.6.8 for a bit.  Initially, it was impossible (from less than I expected, would be the same old process, I have always used, via system preferences > startup disk).  You can read the details of this experience here and more here if you are interested.  This latest attempt to get Yosemite on this machine was a very negative experience.  Yosemite is still there on an internal HD, but I tried not to boot on it since then.

Now I take another look at this.  What is the engine now, is that I want to update my iPad Mini 3 iOS 10.  But that (update of an iDevice iOS 10) requires iTunes 12.5.1.  And iTunes 12.5.1 requires Mac OS X 10.9.5 or newer - it won't work with 10.6.8.  I'm looking for my options.

Right now, I have three large internal HDs: HD #1, 2 # HD and HD #3, each 1 TB.

HD #1 has 10.10.3 Yosemite on this.  I started from this time and have not resumed since.

HD #2 has 10.6.8 Snow Leopard top.  This is my main operating system and startup of daily drive.

HD #3 is nothing special about it.

Although HD #1's Yosemite about that, I have only started from this disc once and hesitate to go back, at least until I can get a way easy and reliable to restart off HD #2.

I understand that I can also get 10.11.6 El Capitan.  I thought that installing on HD #3.  That sounds like a reasonable to add option, but again, I want to make sure it won't cause problems to switch back to start off HD #2 in Snow Leopard (such as installation of Yosemite on HD #1).

What is the best way for me to go about safely - preserve the option to start easily in 10.6.8 on HD #2?

Thanks for the help!

If you start or restart now Option (Alt) key and calls the Startup Manager, you should be given the choice at the start of any boot disk OS X on any of the readers.

See > How to choose a boot on your Mac - Apple Support drive

Tags: Mac OS & System Software

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