Startup Disk Again Mac Os About This Mac
How to repair a Mac disk with Disk Utility
Apply the Showtime Assist feature of Disk Utility to observe and repair disk errors.
Disk Utility tin can find and repair errors related to the formatting and directory structure of a Mac disk. Errors can pb to unexpected beliefs when using your Mac, and meaning errors might even prevent your Mac from starting up completely.
Before proceeding, make certain that you have a current backup of your Mac, in example you need to recover damaged files or Disk Utility finds errors that it can't repair.
Open Disk Utility
In general, you can just open Disk Utility from the Utilities binder of your Applications folder. However, if your Mac doesn't outset up all the way, or you want to repair the disk your Mac starts upwards from, open Disk Utility from macOS Recovery:
- Determine whether you're using a Mac with Apple tree silicon, then follow the appropriate steps:
- Apple silicon: Turn on your Mac and continue to press and concur the power button until you see the startup options window. Click the gear icon labeled Options, then click Go along.
- Intel processor: Turn on your Mac, and so immediately press and hold these two keys until y'all see an Apple tree logo or other image: Command (⌘) and R.
- You may be asked to select a user y'all know the password for. Select the user, then click Next and enter their administrator password.
- From the utilities window in macOS Recovery, select Disk Utility and click Keep.
Select your disk in Deejay Utility
Cull View > Testify All Devices (if bachelor) from the menu bar or toolbar in Disk Utility.
The sidebar in Disk Utility should now bear witness each available disk or other storage device, starting time with your startup disk. And below each disk you should meet any containers and volumes on that disk. Don't see your disk?
In this example, the startup disk (Apple SSD) has ane container and ii volumes (Macintosh Hard disk drive, Macintosh HD - Data). Your disk might not have a container, and it might have a unlike number of volumes.
Repair volumes, then containers, then disks
For each disk that yous're repairing, start by selecting the last volume on that disk, so click the First Help button
or tab.
In this example, the concluding volume on the deejay is Macintosh HD - Data.
Click Run to begin checking the selected volume for errors.
- If there is no Run button, click the Repair Disk button instead.
- If the push button is dimmed and you tin can't click it, skip this stride for the disk, container, or book you lot selected.
- If you're asked for a countersign to unlock the disk, enter your administrator password.
Afterward Deejay Utility is done checking the volume, select the next item above information technology in the sidebar, then run Starting time Aid again. Proceed moving upward the list, running First Assistance for each volume on the deejay, then each container on the disk, then finally the disk itself.
The guild of repair in this example was Macintosh HD - Data, then Macintosh HD, then Container disk4, then Apple tree SSD.
When washed, quit Disk Utility. If you used Disk Utility from macOS Recovery, you tin now restart your Mac: choose Apple carte du jour > Restart.
If Disk Utility found errors that it tin can't repair
If your disk doesn't appear in Deejay Utility
If Disk Utility tin can't see your disk, it as well can't run across whatsoever containers or volumes on that disk. In that instance, follow these steps:
- Close downwards your Mac, so unplug all nonessential devices from your Mac.
- If yous're repairing an external bulldoze, brand sure that it'south connected directly to your Mac using a cablevision that yous know is adept. Then turn the bulldoze off and back on.
- If your disk withal doesn't announced in Disk Utility, your Mac might need service. If yous need help, please contact Apple tree Back up.
Published Date:
Source: https://support.apple.com/en-us/HT210898
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