Unable to unmount for repair

[abkarino]

I tried to install Sierra.
When I finish the USB setup and open the drive using clover, I get macOS couldn't be installed.
Unable to unmount volume for repair.
From the log I can see the error is related to CoreServices.
It can't bless it possibly because it doesn't exist.
Log attached.

EDIT:
My disk is working perfect. I ran first aid and it shows no error.

 

[kamalaggi]

Y

I tried to install Sierra.
When I finish the USB setup and open the drive using clover, I get macOS couldn't be installed.
Unable to unmount volume for repair.
From the log I can see the error is related to CoreServices.
It can't bless it possibly because it doesn't exist.
Log attached.

EDIT:
My disk is working perfect. I ran first aid and it shows no error.

I had same error. Installing Sierra on partition 1 fixed it.

 

[abkarino]

I had same error. Installing Sierra on partition 1 fixed it.

Thanks for reply.
That is not possible.
The first 3 partitions are reserved for EFI, System and Recovery. "Windows additional partition"
I wonder if there is another solution that won't force me to remove my current windows.

 

[kamalaggi]

Thanks for reply.
That is not possible.
The first 3 partitions are reserved for EFI, System and Recovery. "Windows additional partition"
I wonder if there is another solution that won't force me to remove my current windows.

I have EFI (Partiton 0), Sierra (Partition 1), Windows (Partition 2). I tried every possible combination and this is the only one that worked for me.

I had to backup my windows partition delete everything of hard drive. Install Sierra first then clean install windows letting it install the boot files etc then restored my windows backup overwriting the clean installed windows.

 

[abkarino]

ok Thanks.
I had 10.9 working perfect but needed to update. Now I have nothing.

 

[SwagBrah]

ok Thanks.
I had 10.9 working perfect but needed to update. Now I have nothing.

Hmm, I had the same problem. Try the following.

1. Backup as much as possible. Both Windows and Mac.
2. Boot Mac, I assume you already downloaded macOS Sierra, so, go to mac partition and delete the macOS Sierra Install files.
They're probably there, so just delete them. You should be left with Applications, Library, System & Users. And maybe EFI Backups.
3. Mount EFI partition with script v3.
4. Install Clover to EFI, download config.plist (don't bother with iMac14,2 plist, just regular uefi config.plist, or legacy, IDK what you use) and put it in /EFI/EFI/Clover/. Also download and put FakeSMC.kext to /EFI/EFI/Clover/kexts/Other/
5. MOST IMPORTANT STEP HERE:
Unmount the EFI partition!
Also unmount WINDOWS partition if you can see it from Mac!
6. Run the Install macOS Sierra from Apps.
7. Restart your PC.
8. Press space while hovering over Install macOS Sierra from Mac HDD, or something similar.
9. Use ONLY "without caches", at first. Try it. Give it a few minutes, install should start.
10. Just let it do it's thing, it should restart after 10-20minutes and post a Apple logo with install continuing for around 10-15 more minutes. Give it more time, since I'm on SSD, and it's fast.

I had the same problem and this is how I fixed it.
My PC lost clover boot entries later, but I explained in the other thread how I got them back, search for the threads I posted in. Now my dualboot is working again, just need to get audio to work.

 

[abkarino]

6. Run the Install macOS Sierra from Apps.

Thanks for the method. Maybe it would benefit other users.
I cleaned the partition so now I don't have a mac. Just the app compressed as backup and the installation media USB.

 

[Mikael25]

Hi folks

I just tried the below method and it worked flawlessly,
1. Install macOS Sierra to some temporary drive
2. Boot into El Capitan and clone this temporary drive to the drive where you wish to install Sierra. Reboot.
3. Now boot from the main drive where you cloned the macOS Sierra which will now install without the subject error.

Cheers

 

[joyesh]

Hi folks

I just tried the below method and it worked flawlessly,
1. Install macOS Sierra to some temporary drive
2. Boot into El Capitan and clone this temporary drive to the drive where you wish to install Sierra. Reboot.
3. Now boot from the main drive where you cloned the macOS Sierra which will now install without the subject error.

I haven't tried this method with upgrade so no idea abt that. But fresh install works perfectly with this method.

Cheers

Going to try this now since I ended up installing Yosemite and since it's incompatible with my Haswell graphics card it lags a lot so I went to install Sierra. Will keep you updated! (good thing I have 2 usb drives and the temp install before full OS setup is only 5GB)

 

[Venildo]

Had that problem today on a dual boot disk (Window+macOS) today, wanting to fresh-reinstall macOS on the partition it was installed before ; having that issue, I've spent a lot of time trying to repair my partitions under Windows or Disk Utility (from the USB installer). Finally, what worked was :

Do not limit yourself to erasing/recreating your old MacOs partition with disk utility. Run the partition tool (the one that allows you to resize/destroy/create partitions, reach it from the button in the left corner of disk utility). Destroy the macOS partition, and recreate one. It will force macOS to rewrite the partition table, and then it'll be happy with it.

That did the trick for me.