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This includes working with unformatted drives as well as unformatted USB flash drives. The disadvantage, however, is that it can make it difficult to work with new unformatted disks you may be using for the first time. This makes using Disk Utility with existing volumes an easy task since there are only a few, and sometimes only one, volumes displayed, cutting down on what could be an overwhelming list of disks, containers, volumes, RAID slices, etc.

Selecting the Initialize button will open Disk Utility, but the disk may not show up if the apps view settings are in the default settings.ĭisk Utility is configured by default to only show formatted volumes. “The disk you inserted was not readable by this computer”. We’ll also demonstrate how to use Terminal to access the remaining hidden disk structures that Disk Utility can’t view directly, including: In this Rocket Yard article, we’re going to look at how to enable Disk Utility to view and work with the types of disk spaces you’re likely to encounter, including: In versions of Disk Utility that came with OS X Yosemite and earlier, you could enable hidden debug modes in the Disk Utility app that allowed you to see and interact with all the space on a disk, including hidden elements, such as the Recovery volume or the secret EFI partitions. Disk Utility, the macOS Swiss Army knife for working with disks and storage volumes, may have a few blades missing, especially when it comes to working with unformatted drives and unused space on a disk or storage volume.