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Booting back into APFS from HFS
Posted by: celliott
Date: January 23, 2019 12:35PM
I have a drive with two partitions. One is the new APFS with Mohave, the second is HFS with Sierra so that I can still run some old software.

Here's the problem. When I go into system preferences to set the startup drive to HFS/Sierra, no problem. Select, restart and there I am. However, when I want to go back the other way: system preferences to select the APFS volume to reboot into, Sierra is not able to see that volume because it can't read APFS. So, I can't select that as my startup drive.

So, how do I boot back? Anyone have some insights? What am I missing or is it not possible? Since they are on the same internal drive, simply unplugging the HFS to force the APFS startup is not possible.
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Re: Booting back into APFS from HFS
Posted by: Gareth
Date: January 23, 2019 12:42PM
Have you tried rebooting and holding down the option key? This is supposed to give you a list of available start-up drives to select from during the boot process. Presumably since the firmware of the computer can now read APFS, hopefully it'll see the APFS partition.
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Re: Booting back into APFS from HFS
Posted by: FormerlySaleenl
Date: January 23, 2019 01:02PM
The option key is the only solution. From there, you use the startup manager.
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Re: Booting back into APFS from HFS
Posted by: RAMd®d
Date: January 23, 2019 02:10PM
The option key is the only solution. From there, you use the startup manager.

That's good to know. I hope I don't forget that when I finally upgrade my OSs.

The only down side is that I can almost never do that with a BT keyboard and have to drag out a wired version.






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Re: Booting back into APFS from HFS
Posted by: wowzer
Date: January 23, 2019 06:00PM
APFS is awful. Why apple doesn’t allow non-Apple disk drives to boot is a real bad decision. My daughters 2015 MacBook somehow got ‘upgraded’ to Mojave’s and it won’t boot because it’s a third party sata SSD. Of course, she had file vault activated, so getting her files off and reinstalling high Sierra was a pita.



All I ever really needed to know, I learned from watching Star Trek.
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Re: Booting back into APFS from HFS
Posted by: Sarcany
Date: January 23, 2019 07:05PM
Quote
RAMd®d
The option key is the only solution. From there, you use the startup manager.

That's good to know. I hope I don't forget that when I finally upgrade my OSs.

The only down side is that I can almost never do that with a BT keyboard and have to drag out a wired version.

Press the Option key on the BT keyboard immediately after the boot-chime. That's when BT initializes.



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Re: Booting back into APFS from HFS
Posted by: celliott
Date: January 23, 2019 09:39PM
Thanks. I've been away from my Mac for awhile this evening. I'll give it a try. I know I had trouble doing that before with the BT keyboard and just assumed you couldn't do it anymore. I assumed it was a part of Apple's security squeeze to keep someone unauthorized from booting into another volume.

I do know that used to work in the older Mac OS.
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