I am trying to install an older OS on an external hard drive to use older software that does not run anymore on High Sierra. I've seen a few links online on how to do this, but nothing really good. Just looking for the steps to install on older OS on an external hard drive, and how to boot from it.
Well, I ended up booting off the Snow Leopard DVD, then I found that I could install Snow Leopard on any drive at that point. I just had to partition one of my internal hard drives, and set it as a GUID Partition Map. Thanks for everyone's help. Ended up being an easier solution than I thought.
Well, I ended up booting off the Snow Leopard DVD, then I found that I could install Snow Leopard on any drive at that point. I just had to partition one of my internal hard drives, and set it as a GUID Partition Map. Thanks for everyone's help. Ended up being an easier solution than I thought.
The major obstacle you must first overcome is to boot from that operating system, or an older one, because a macOS installer won’t work at all if it’s launched from a superseding OS. If you can do that though, the rest is easy–just designate the destination when it offers that option: choose “Show All Disks” when it appears.
Yeah that's the problem. I just need to find a way to install the older OS onto an external drive. After that, I think I should be able to select the external drive as the start up disk and boot from it.
if you don't have it then find an external which has an older operating system and that it can boot your machine. Once that's done then find a DMG file or similar to install the older operating system.
Well, unless you already have a Mavericks installer or it's in your Purchased items in the App Store it's no longer available. If you do, you would have to restore your Mac Pro to Snow Leopard, run the Mavericks installer to the external, then reinstall High Sierra.
Seems like too much work. I suppose if you do have access to the Mavericks installer, you could create a Mavericks guest in a virtualization program and use it to install to an external drive.
Gives me a headache thinking about this. 😎
What program is so important?
Well, I do have a copy of the Mavericks installation file. But are you saying that I would need to install Snow Leopard instead? That would still work for me, but I'd have to find the disc. I just want to be able to boot from an external and run the older OS when I needed to, but still keep High Sierra on the main hard drive for all other times. Didn't know if it was possible, but saw some discussions about it.
I do a lot of video editing and create DVDs, and iDVD is still the best program out there for that purpose, but it keeps crashing on High Sierra. And I also have other programs that I can't access anymore, but would like to.
The problem is, you can't run the Maverick installer on anything newer than it is. So you either have to downgrade in order to run it, or as I mentioned install Mavericks as a guest then use the guest to install Mavericks to the external drive.
It's actually easier to do than explain.
在 2018年3月11日，上午4:48，Apple Support Communities Updates <discussions-updates@apple.com> 写道：
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dialabrain <https://discussions.apple.com/profile/dialabrain?ac_cid=tw123456> has posted in the macOS High Sierra community.
How do I install on older mac OS onto an external HD? <https://discussions.apple.com/thread/8314311?answerId=33140064022#33140064022&ac_cid=tw123456#33140064>
FWIW, you cannot boot from an OS older than what came with your Mac.
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You can create a bootable USB flash drive from an OS installer, then use that to boot from and install the older OS.
How to create a bootable installer for macOS - Apple Support
or use DiskMaker X.
FWIW, you cannot boot from an OS older than what came with your Mac.
What Mac do you have and what version of OS X was installed?
I have a Mac Pro that came with Snow Leopard (but currently has High Sierra), and I'm hoping to install Mavericks on an external drive.
Welcome.
How do I install on older mac OS onto an external HD?
