There is no hard and fast rule for a minimum partition size.
Just think of how the partition will appear within Disk Utility. In some cases, the partition can be so small that the adjustment dividers are difficult, or nearly impossible to manipulate. In addition to adding volumes, Disk Utility can also delete existing volumes. When you delete an existing volume, its associated data will be lost, but space the volume occupied will be freed up. You can use this new free space to increase the size of the next volume up.
The upshot of deleting a volume in order to make room to expand another is that their location in the partition map is important. The opposite, however, is not true.
Partitions Rules to Resizing Volumes & How to Without Losing Data | Other World Computing Blog
Deleting vol1 will not allow vol2 to be expanded to fill the space vol1 use to occupy. Disk Utility will make the changes to the hard drive. Once the volume is removed, you can expand the volume immediately above it by simply dragging its resize corner. Disk Utility uses the partitioning information you supply to create volumes your Mac can access and use.
When the partitioning process is complete, your new volumes should be mounted on the desktop, ready to use. Before you close Disk Utility, you may want to take a moment to add it to the Dock , to make it easier to access the next time you want to use it. Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About.
He is the president of Coyote Moon, Inc. Updated November 11, The difference between hard drives, partitions, and volumes. How to resize, add, or delete volumes.
Disk Utility for macOS Sierra: Partition a physical disk using Disk Utility
A Mac with OS X This guide will work with OS X Do not attempt to use earlier versions of Disk Utility for this process. One or more drives whose volumes you wish to resize, add to or delete. Volumes are most often made up of a single hard drive partition that contains a Mac file system. When you partition a hard drive, you physically create separate sections on the drive ; each of these sections is called a partition. A partition defines a specific area of a hard drive. Data can be erased in multiple ways. The default method on the Mac deletes the data table entries for the location of the file but does not actually remove the file itself from the hard drive or volume.
Resize Partitions in Mac OS X with Disk Utility
The practical effect of this is that your Mac no longer sees the file, and the space it uses is now marked as available free space. You can also specify optional erase options that will completely remove the data. Your Mac can use five different types of formats: Current drives and volumes will display in a list pane on the left side of the Disk Utility window. Depending on the space available, you can create multiple volumes by selecting the new partition, then clicking the Add button. Mac OS Extended Journaled: Uses the Mac format, requires a password, and encrypts the partition.
Uses the Mac format and is case sensitive to file and folder names. Uses the Mac format, is case sensitive to folder names, requires a password, and encrypts the volume. After you partition a storage device, an icon for each volume appears in both the Disk Utility sidebar and the Finder sidebar. If you have multiple volumes on a device and one of them is running out of space, you may be able to enlarge it without losing any of the files on it. To enlarge a volume, you must delete the volume that comes after it on the device, then move the end point of the volume you want to enlarge into the freed space.
When you delete a volume, all data on it is erased. Be sure to back up your data before you begin.
In the sidebar, select the device that contains the volume you want to enlarge, then click the Partition button. In the pie chart on the left, select the volume you want to remove, then click the Remove button. You can erase all volumes on a device and create new ones. If you simply want to erase a volume, see Erase a volume.
Add a volume to a device without erasing existing data
Erasing and partitioning a device destroys all data on all volumes of the device. Select the device in the sidebar you want to erase and repartition, then click the Erase button.
Master Boot Record: Disk Utility for macOS Sierra: Partition a physical disk using Disk Utility. Add a volume to a device without erasing existing data Select the device in the sidebar, then click the Partition button.
Click each volume in the pie chart on the left, then enter a name for it. Enter the size or drag the divider to increase or decrease the size of each volume.
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