Hi Folks!
We're getting this really strange error when trying to reinstall macOS High Sierra 10.13.6 on an iMac 5k Fusion Drive:
MacOS could not be installed on your computer.
Invalid Request
Quit the installer to restart your computer and try again.
Anyone else seen this?
iMac with Retina 5K display, OS X El Capitan (10.11.6)
You split the fusion drive?? It is not clear, oh I see the link says "fix" the Fusion drive. So maybe you had some issues here—non the less
I do know APFS is not ready for Fusion drives.
Typically HFS+ format can be forced from the installer from the command line:
/Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/startosinstall --converttoapfs NO
If I open fire up Terminal from Recovery Mode and type ‘diskutil info disk1’ (disk0 is my 3TB hdd, disk1 is my 128gb ssd), the SMART Status is “failing”. I haven’t tried this yet, but if I were to split my fusion drive and install High Sierra on just the hdd, I’m betting it would probably work. I may just try it out to verify my hypothesis - that the failing install is due to a failing ssd bound in a fusion drive.
When turning on the computer keep Command + Option + R pressed until you enter Recovery mode. And have your Mac download the latest High Sierra version. Here you should be able to install the system.
I haven't had a chance to try what was suggested here, YET! Sorry guys, but in a pinch, I had a macOS USB installer with 10.13.3 on it. And that worked! for whatever reason. But funny you should say I/O errors. Where did you see this?
Machattan wrote:
We're getting this really strange error when trying to reinstall macOS High Sierra 10.13.6 on an iMac 5k Fusion Drive:
MacOS could not be installed on your computer.
Invalid Request
Quit the installer to restart your computer and try again.
Do you meet all the requirements?
Hi! Thanks for the response!
So yes, hardware definitely meets requirements. It's an iMac 5k 2015. We booted into a 10.13.6 macOS install booter created from this link: How to create a bootable installer for macOS - Apple Support
Then we zapped the drive using this link: How to fix a split Fusion Drive - Apple Support
and now every time we try to install the OS we get this error: Invalid Request
Did you ever figure this out? Having the same issue with my 2012 iMac fusion drive that I split and put back together. I think my internal SSD is on the fritz (SMART errors) and that may be the cause..?
How are you trying to reinstall the OS? (sorry I realized I said new)
MacOS could not be installed on your computer
