The worst case is when Mac keeps crashingВ after you deleted one of the key partitions in the startup disk. The next time you want to access the external hard drive on Mac, you could receive an error message like ' The disk you inserted was not readable by this computer.' 3. If you don't, the risk of disk corruption is increased. For example, you should always choose the Eject button before removing an external hard drive. Disk corruptionД®xcept for files being deleted, what's worse is that the hard drive itself is corrupted. So, be careful with these options mentioned above and always back files up. If you don't back up the data, you'll lose files after you erased a hard drive, deleted an APFS volume, or formatted a partition. Your documents, emails, photos, music, movies, etc.

Usually, there are three possible problems. If you don't use Disk Utility in the right way, you could get into trouble. But the risk of using Disk Utility is also an important part that you should know. Of course, you can perform many disk-related tasks with Disk Utility, simple and easy. Even so, it's undeniable that what Disk Utility can do now is still good enough in many ways.Дisk Utility brings more insights into disk management on Mac, on the condition that you use this tool in the right way. For example, you can't repair disk permissions in Disk Utility anymore in macOS. Some other features are dismissed along with the development of Mac operating systems. Verify a disk's integrity and repair it with First Aid if the disk is damaged or corrupted.Create, backup, convert, compress, encrypt, and restore disk images.Combine multiple hard disks into a RAIDВ set for better performance and reliability with increased storage capacity.Erase and format disks with multiple file system options supported.Create, resize, and delete partitions by allocating space to storage devices.Mount, unmount, and eject connected hard drives including SSDs.

Your mac os x startup disk