You can, however, run First Aid on your drive anytime in macOS.
Click on First Aid followed by Run to scan the disk for problems and attempt to fix them. By attempting to boot into Safe mode, macOS will scan and repair any errors it finds on the disk.
How to Verify (& Repair) a Disk from the Command Line of Mac OS X
Safe mode boots your operating system with only the bare minimum it needs to run. No third party kernel extensions will boot, login items are skipped, and it empties certain caches. To boot into Safe mode: Turn your computer off, then press and hold the Shift key while your computer boots. If your computer has hung on boot, shut it down by holding the power button until the machine switches off around 10 seconds first.
Should your computer boot properly, try restarting and booting as normal.
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You can then restart into Safe mode, remove the problem extension, and try again. Every Mac ships with Recovery mode, which lives on a separate partition on the startup disk. To boot into Recovery mode: Later you also may want to restore it. Here's how to do both.
Keep in mind this requires an internet connection and will take a lot longer, since macOS needs to download the image first. Select it from the list on the left, then click First Aid followed by Run. File system consistency check or fsck for short is a longstanding Unix tool for checking and fixing drive problems. Depending on the size of your volume, the type of drive you have installed, and the potential problem, fsck can take a while to complete.
Patience and persistence is important if you want to fix your drive this way. Gonna be a bad weekend, as this is not what a Mac is supposed to look like during boot. This boot mode allows you to make changes to shared user resources. To boot into Single User mode: You can type fsck -fy to run fsck. If you have a firmware password set on your Mac, Single User mode is not available to you.
If you interrupt the process while it is making changes to your drive, you may incur data loss.
How To Repair & Verify Your Hard Drive From The Command Line [OS X Tips] | Cult of Mac
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Verifying a Disk from the Command Line in OS X Verifying the volume determines if the drive needs to be repaired and can be done with the following general syntax: Enter your email address below: Posted by: Howie Isaacks says: January 28, at January 30, at Fred says: February 16, at 8: February 4, at AKD says: October 19, at 3: Uros says: September 19, at George Holmes says: July 30, at Leave a Reply Click here to cancel reply. Shop on Amazon.