A dilemma here !

[apanacci]

Hey guys wondering if someone may know the problem here. I had my tech guy put in Open Core on a HD in my 2012 MacPro. He installed Monterey. I have another drive in the computer with Mojave on it. That is my main drive. The problem is when I want to startup on the Mojave drive a circle appears with a line thru it and the computer shuts off. Is there a way around that or do I need to configure the Monterey drive and not use the Mojave drive. If I take out the Monterey drive Mojave starts up ok. Any suggestions would be appreciated thanks !

[HCMarkus]

My highly technical and, I'm sure, helpful suggestion: Take out the Monterey Drive.

[apanacci]

Ha! Great minds think a like ! Thats funny Markus ! When all else fails look for the obvious

[James Steele]

Ha! Great minds think a like ! Thats funny Markus ! When all else fails look for the obvious

Here's my truly unhelpful advice. Start scheming now to get an Apple Silicon Mac someday. I know it's a painful transition. I'm arguably still in the midst of mine and had to get new interfaces since no PCIe slots in my Mac Studio, but you will thank yourself when you can finally break free of the Intel world.

Not saying this to be elitist. I had to sell a pretty nice guitar to fund the greater portion of my Mac Studio, but I figured it was time to put my cheesegrater out to pasture. What great machines those were though!! Truly a classic and the fact that, yes, they are still viable today speaks volumes about how well they were engineered!

[apanacci]

Great advice. It does feel like I am chasing this and not catching up. I guess I am also relying on my PCIe slots and other connections the newer computers dont have. Scares me but a lot of you have figured it out. I will look tom the future ! Thanks James and Markus

[James Steele]

Great advice. It does feel like I am chasing this and not catching up. I guess I am also relying on my PCIe slots and other connections the newer computers dont have. Scares me but a lot of you have figured it out. I will look tom the future ! Thanks James and Markus

Well, I wanted to be very careful suggesting it, because it sounds flippant and I'm the last guy to act as if money is no object. It was painful and I still have a PCI-424e card, HD192, and 24I/O just sitting in a corner in my practice room waiting for me to muster up the motivation to take pics and put in on Reverb and not make much on the sale. I sometimes find myself rationalize keeping it. I tell myself I could set up a secondary workstation for editing, but I think I'm lying to myself. I also tell myself that I shouldn't try to get a few bucks from my 5,1 12-core because I might use it as a VEP server, but again... I think I'm lying to myself there too, but not as blatantly.

Good thing is that if you can hold out, it seems that Apple might be on the verge of another leap forward with the M4, so it does pay to lay low and wait for the reviews and the smoke to clear. I'm fairly certain that once I get though all the pain of transition which I think I'm mostly over and have my studio configured nicely, I may do one last "trade up" and perhaps make my M1 Max Mac Studio an overkill office machine, and go for an M4 or whatever in a year or two.

[mikehalloran]

With Apple Silicon, many apps will not run if installed on an external boot drive. Someone posted about that wondering when MOTU was going to fix that... uhhh... being that Apple crippled this functionality, my guess is never.

It looks like your guy got a head start on the future.

What he should have done was to install Open Core onto a new APFS Volume on your System Drive (do not partition an SSD running High Sierra or later). Will that work? I don't know but that's how it's supposed to be done for any chance at success. Among the many cool features of APFS Volumes is that they are easy to create and just as easily deleted giving you back all of that space if you no longer have the need.

A 4TB SATA III SSD with 3D NAND can be had under $200 on Amazon. 8TB is a bit pricy these days hovering in the $650 range.

[bayswater]

What he should have done was to install Open Core onto a new APFS Volume on your System Drive (do not partition an SSD running High Sierra or later). Will that work?

It worked for me while I was setting up a OSX12 volume and retiring a 10.14. Obviously some app versions were too old to run on V12 but for the most part they worked. Even plugins with a symbolic link worked fairly often. The odd thing was starting from Mojave reported that the Monterey volume was invalid, but it was accessible and files could be opened from it under Mojave.

[mikehalloran]

This guy did it successfully.

https://www.motunation.com/forum/viewtopic.php?t=74251

Note that he installed Open Core and Sonoma on the System drive of his 2012 MBP.

I have a couple of 2012 MBPs but I’ve no interest in modifying either this way. One runs Mojave for a pair of apps that may never become 64 bit. The other runs Catalina and is a test machine for the many apps that I beta test these days (DP is not one of them). I could install one of my spare 4TB SSDs into one of them and dual-boot but I’ve not taken the time.