You can simply add additional partitions by pressing the plus button and then using section control (2) to adjust its size. Press the Partition button on the top and a new window with a partitions allocation pie chart will appear.On the picture below you can see our test configuration - external USB drive with a single partition “Test-Resizing”.Open Disk Utility by typing the first part of its title in Spotlight search:.So, let’s check how to shrink a partition using Disk Utility: You can shrink partition size with no data loss if there is unused space in its volume (remember, volume is a layer of file systems above a partition). It is a common partition table for the latest Macs, but check it anyway. You can avoid data loss while resizing the partition only for GUID-partitioned drives.If there is something in between - you need to remove it. You can only extend the partition to the free space right after the current partition.So, if you built a Fusion Drive in macOS Yosemite - don’t use OS X Lion or other older versions. If using an Apple Fusion Drive (technology that represents separate HDD and SSD drives like one logic device), never use a Disk Utility older than one used for the creation of Fusion Drive.In this example we will use macOS High Sierra.ĭisk Utility is quite a simple tool to resize partition in Mac, but there are a few recommendations that can save your time: Its GUI was seriously redesigned the release of “El Capitan ”, so you may notice some interface differences if running an older Mac. You can perform any disk-related operations in macOS using the built-in Disk Utility.

Remove partition mac external drive