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How to Merge Partitions / Volumes

I used a Mojave OS for about three months, then I decided to update to the Catalina OS. At the point of installation, I experienced a few challenges which made me partition the PC. Now I have installed the new OS, and at the same time deleted the old (Mojave) OS. But my PC is showing me that I have a total hard disk space of 60GB, instead of 128GB.


How can I merge the partitions together to have one disk size of 128GB?

MacBook Air 13", macOS 10.15

Posted on Oct 27, 2019 12:42 PM

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Question marked as Top-ranking reply

Posted on Oct 27, 2019 12:49 PM

At the point of installation, I experienced a few challenges which made me partition the PC.

You do not specify what these challanges were that lead to your present problem?



But my PC is showing me that I have a total hard disk space of 60GB, instead of 128GB.

And where are you reading this information?




Reformatting the parent drive from Internet Recovery>DiskUtility>View>Show All Devices

reformatting/initializing your physical drive—GUID/apfs this will erase ALL data.


Quit DU, re-install the macOS, restore your user data from a backup.


Recovery: https://support.apple.com/en-us/HT204904

How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250




3 replies
Question marked as Top-ranking reply

Oct 27, 2019 12:49 PM in response to Segs007

At the point of installation, I experienced a few challenges which made me partition the PC.

You do not specify what these challanges were that lead to your present problem?



But my PC is showing me that I have a total hard disk space of 60GB, instead of 128GB.

And where are you reading this information?




Reformatting the parent drive from Internet Recovery>DiskUtility>View>Show All Devices

reformatting/initializing your physical drive—GUID/apfs this will erase ALL data.


Quit DU, re-install the macOS, restore your user data from a backup.


Recovery: https://support.apple.com/en-us/HT204904

How to use Time Machine to back up or restore your Mac: https://support.apple.com/en-us/HT201250




Oct 27, 2019 1:00 PM in response to Segs007

You do not specify what these challanges were that lead to your present problem?

Okay, so I kept having the error message "the selected volume is not APFS formatted" or something related.


And where are you reading this information?

Under disk utility. I could still see the first partition, and the new partition. It's just that the first is now empty.


Thanks for the assist

Oct 27, 2019 1:04 PM in response to Segs007

Segs007 wrote:

I kept having the error message "the selected volume is not APFS formatted" or something related.



Well hfs can be converted on the fly to apfs—but it sounds like you are past that point.


the empty partition need to be removed, the easiest is


Start over. You have multiple issues. See the post above for your path forward.

How to Merge Partitions / Volumes

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