How to Add, Delete, and Resize Existing Volumes with Mac Disk Utility

It is well known that the Mac Disk Utility software is a well equipped program that was integrated into MacBook product by Apple. The purpose was of managing every single need related to disks and drives on Mac. Mac disk utility app can be used to easily create several partitions on Mac’s hard drive without much trouble or hassles. Partitioning has never been easier than the use of Disk Utility software. In the earlier versions of Mac’s Operating Systems, two different inbuilt apps namely “Drive Setup” and “Disk First Aid” were provided to carry out and take care of periodic management of the drives and disks issues. But in recent Mac OS X versions, especially OS X Leopard all the functions in the previous two apps have been combined into the “Disk Utility” program. Also, better features have been added to aid and ease management of disks and drives on a Mac.

The new “Disk Utility” app also bags along a rare feature for partitioned drives, which is the feature for How to Add, Delete, and Resize Existing Volumes with Mac Disk Utility of an already created partition of a hard disk. It works without affecting the contents and data on that partition of the hard drive. In earlier times, once a hard disk had been successfully partitioned, it was nearly impossible to increase the size of a partition without deleting the entire partition. And repartitioning would result in a complete loss of files and data stored on that volume. But thanks to the new Disk Utility software on Mac, Adding, deleting and resizing a hard drive’s partition has never been easier. Not only has disk Utility App been made better functionally, but it also caused a change in user interface to a preferable and more enticing one. In this article, we’ll be looking into all the steps on How to Add, Delete, and Resize Existing Volumes with Mac Disk Utility.

How to Add, Delete, and Resize Existing Volumes with Mac Disk Utility-1

Part 1: How to add new volumes with Mac Disk Utility

You can add volumes with Mac Disk Utility to a created or already existing partition of a hard disk without losing the files store on that partition. The process involves disk utility app splitting the available disk space into two, storing existing data on the volume in one half and creating a new volume on the other half. In order to add the new volume to a hard disk. Follow the steps below carefully

  1. Open Utility folder under Applications and then Launch “Disk Utility” from there.
  2. On the home screen of the software, the left side pane displays existing drives and volumes in a list.
  3. To re-partition drive, you should select the main physical drive with a disk icon containing the volumes listed below the hard drive
  4. After selecting the drive linked with volume to be expanded, click on the “Partition” tab
  5. Now select the already existing volume which u want to split and lick on the add or plus (+) button to add volumes with Mac Disk Utility
  6. How to Add, Delete, and Resize Existing Volumes with Mac Disk Utility-2

  7. Simply select the volume then enter the size you want to allocate in Gigabyte(GB) or drag the divider seen on the software to the desired size for the two volumes
  8. Next, Mac Disk Utility software would display how the selected volumes would be configured when you click on the “Apply” button. You may also click on “revert” to roll back changes.
  9. A confirmation sheet would be displayed before the changes are made. Now click on the “Partition” button to complete the process to add volumes with Mac Disk Utility.

And just like that, you add volumes with Mac Disk Utility on an already existing hard disk partition without affecting the files on it. Easy!

Part 2: How to Delete the existing volumes with Mac Disk Utility

Apart from just adding a new volume to an existing disk partition, you can delete volumes with Mac Disk Utility. By doing this, all files and data available on that Volume would be lost together with it which will free up the space occupied by the volume. This will lead to increase/enhance the size of other partitions and volumes.

Follow these steps to delete existing Volume with Disk Utility

  1. Open Utilities under Application menu and launch “Disk Utility”
  2. The available volumes and drives would be displayed on the left hand side of the software in the list pane.
  3. Select drive which is linked or associated to the volume you want to delete
  4. Click on the “Partition” tab on the main screen of the program
  5. Select the already existing volumes which you wish to delete from the window
  6. Now click on the subtract (-) button to delete volumes with Mac Disk Utility
  7. How to Add, Delete, and Resize Existing Volumes with Mac Disk Utility-3

  8. A confirmation sheet displaying how the selected volumes would be deleted alongside every single one of the data and files initially stored on that volume.
  9. You can now click on “Remove” to commence the process to delete volumes with Mac Disk Utility.
  10. Once the deleting process has been completed, changes would be made to the hard drive. So now you can expand relating volumes with the deleted one by dragging the resize divider.

Part 3. How to Resize Volumes- Enlarge a volume

Resizing of disk partitions has not only become possible, but easy as well to resize volumes with Mac Disk Utility. It can also be used to resize partitions on an external hard drive without losing existing files and data. It is advisable to backup your files using Time Machine provided anything goes wrong even though the possibility is slim.

Follow this processes to resize a partition of your hard drive without losing its files.

  1. Open Mac Disk Utility software from Application menu under Utilities folder
  2. Select the “Partition” tab and then select the Partition to be resized
  3. Now click on the small corner widget at the right hand corner of the Partition layout section of the software and move the part as you wish till it gets to your desired level to resize volumes with Mac Disk Utility.
  4. You will see changes in the sizes of the partition on the right hand side of your screen as you move the widget to resize the partition.
  5. How to Add, Delete, and Resize Existing Volumes with Mac Disk Utility-4

  6. When done, you can simply click on the “Apply” button to resize volumes with Mac Disk Utility the changes made or click the “Revert” button to roll back any changes.


How to Add, Delete, and Resize Existing Volumes with Mac Disk Utility has never been easier. But it is still advisable to backup files before carrying out any of this processes to avoid loss of files and data in case anything goes wrong. If you follow judiciously every single step in this article, you should have your files as intact as you left them.

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