We don’t at all times know why a drive linked to a Mac begins to fail or the system turns into sluggish and nothing helps. Should you’ve gone via routine troubleshooting and nothing fixes the issue—together with reinstalling macOS as a final resort—chances are you’ll wish to attempt to get better the startup quantity’s contents by booting utilizing recoveryOS, a particular partition in macOS designed for serving to with what it says on the label: restoration!
First, restart your Mac into recoveryOS:
With an Intel Mac, select > Restart or energy up your Mac. Maintain down Command-R throughout startup till you see the progress bar beneath the Apple icon.
With an M1 Mac, energy down your Mac usually if it’s energetic (by way of > Shut Down). Then maintain down the facility button till “Loading startup choices” seems, which may take about 10 seconds. Finally, a number of drive icons will seem together with the Choices icon. Click on the Choices icon and log in with an administrator account if prompted.
The macOS Restoration dialog seems and you may try to repeat the startup quantity:
Connect an empty drive or one with an empty quantity or one that may be erased that’s sufficiently big to include all the information within the startup quantity.
Select Utilities > Disk Utility.
Choose the empty drive or quantity. (Should you don’t see the drive, select View > Present All Gadgets.) Warning: The quantity you choose right here might be erased and can’t be recovered.
Select Edit > Restore.
From the “Restore to ‘empty quantity title’?” dialog’s “Restore from” menu, choose the startup quantity you wish to copy.
Warning: Whenever you carry out the subsequent step, the amount you chose might be irrecoverably erased. Click on Restore and observe prompts.
When full, select > Shut Down.
Disconnect the drive containing the copied quantity and fasten it to a different Mac to get better recordsdata or use for migration.
This Mac 911 article is in response to a query submitted by Macworld reader Derek.
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