macOS boot entry disappeared after trying to re-partition through Disk Utility

[huijkkkk97]

If you do not have the clear idea, provide a screenshot for the above steps to assist.

I'm assuming you meant 840 and not 860: this is what I should do?

 

[EliteMacx86]

I'm assuming you meant 840 and not 860: this is what I should do?
View attachment 5347

Yes, 840. Looks good. Just click on Apply and you should be good to go.

 

[huijkkkk97]

Yes, 840. Looks good. Just click on Apply and you should be good to go.

Doesn't seem to have resized my macOS partition.

 

[EliteMacx86]

View attachment 5348

Doesn't seem to have resized my macOS partition.

As it is not. You can clearly see that a container disk5 has a partition with the name Untitled. You must delete that partition.

Sometimes, it is not possible to delete a volume from a container. In such case, format the volume as a different File System than APFS and then delete the partition.

 

[huijkkkk97]

Sometimes, it is not possible to delete a volume from a container. In such case, format the volume as a different File System than APFS and then delete the partition.

But after formatting the partition as another format (I chose exFat), you still can't really erase it (unless I'm missing something):

 

[EliteMacx86]

But after formatting the partition as another format (I chose exFat), you still can't really erase it (unless I'm missing something): View attachment 5349

You should be able to erase the volume. Click on Erase button and the disk should be erased. Once erased, provide a screenshot.

 

[huijkkkk97]

You should be able to erase the volume. Click on Erase button and the disk should be erased. Once erased, provide a screenshot.

It is "erased", but in the sense that it's formatted again, not actually deleted (and my macOS partition is still the same).

 

[EliteMacx86]

It is "erased", but in the sense that it's formatted again, not actually deleted

That was the goal!

Select Samsung SSD 840 EVO 250GB Media and click on Partition button and provide a screenshot.

 

[huijkkkk97]

Select Samsung SSD 840 EVO 250GB Media and click on Partition button and provide a screenshot.

 

[EliteMacx86]

View attachment 5351

If you see, there is no option to delete the volume. Try to format the Untitled Volume as APFS. Quit Disk Utility, open it again and provide a screenshot.