You’ll see the above prompt.RELATED: How, When, and Why to Repair Disk Permissions on Your MacIf a hard drive is acting up, Disk Utility’s First Aid function is the first thing you should try. One of them: volumes on the same drive pool storage space, meaning you’ll see two separate drives in Finder, but won’t have to manage how much storage space each volume uses. To add a new APFS volume, simply select your system drive, and then click Edit > Add APFS in the menu bar. APFS is Apple’s new file system, the default on solid state drives as of macOS High Sierra, and it’s got all sorts of clever tricks up its sleeve.One pass should be good enough, but you can always do a few more if you feel like it. You can also choose to only erase its free space.You can use this feature to securely wipe a hard drive. Click a drive, then click the “Erase” button, then click “Security Options” to select a number of passes to overwrite the drive with. Secure-Erase a Partition or DriveThe Erase button allows you to erase an entire hard disk or partition.
![]() ![]() ![]() If one drive dies, your data is still available elsewhere. This is an advanced feature most people won’t need to use, but it’s there if you need it.Mirroring (RAID 1) means data you write to the RIAD is stored on each partition or drive for failsafe purposes. Combine disks and partitions into one or more RAID sets and choose whether you want to mirror, stripe, or concatenate your data.
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