Apple made it easier to resize partitions—logical divisions of a disk drive into separate mountable volumes with different properties—several releases of macOS ago. A Macworld reader resized their main volume to 369GB to set up a Boot Camp partition, but then realized it was too small. They wondered how to fix this.
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In the right circumstance, you can simply follow these steps without having to back up the entire drive, erase and reformat it, and add new partitions.
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Always back up your drive before attempting to resize partitions in case something goes wrong, or you accidentally click to proceed on a destructive operation.
- Launch Disk Utility.
- Select the disk, not the volume, in the left-hand lists of disks.
- Click the Partitions button.
- You can now delete other partitions (select and click the – button), and type in the new size of your main partition in its Size field.
- Warning! Click Apply to proceed, and Disk Utility will warn you whether it will be a destructive operation, deleting the partition’s data and re-creating, or not. If it’s non-destructive, proceed.
I haven’t found a complete consistency in which drives have non-destructive resizable partitions or not. You can read a lot of detail about macOS drive partitioning, and still find that a volume that meets all the parameters for resizing without erasing, and still be told by Disk Utility that the partition will be erased.
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If you need to erase to repartition, make a full clone, boot from macOS Recovery, and use Disk Utility in that mode to repartition, which will keep macOS Recovery intact if it’s a startup volume. You can then also restore your partition from a clone using Disk Utility as well.
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