Disk Utility User Guide

Disk Utility can fix certain disk problems—for example, multiple apps quit unexpectedly, a file is corrupted, an external device doesn’t work properly, or your computer won’t start up. Disk Utility can’t detect or repair all problems that a disk may have.

Mar 01, 2017 The second option is the Extended Check; this is the check that is run within Drive Pulse by default when your computer is in idle mode. If you were to start an extended physical check within Drive Genius onto a 1TB hard drive you would expect the scan to run for multiple days, up to a week in time. Oct 23, 2017 Check the description under your hard drive. This will display how much free space is available on your hard drive in gigabytes (GB) under your hard drive's name (e.g '318.21 GB available of 499.42 GB').

If you run First Aid on a disk, Disk Utility checks the partition maps on the disk and performs some additional checks, and then checks each volume. If you run First Aid on a volume, Disk Utility verifies all the contents of that volume only.

For

Solution 1 Preview storage device. When you select a file in the Finder of Mac and press the blank. How to check disk for errors in Mac OS X Errors on the hard disk on your Mac OS X computer can be the cause why the computer doesn't run as fast as it used to. Let me show you how to check and repair the errors on a disk drive. If you don’t know how to check your disk space use on your Mac, here’s where to look. Options 1 and 2: From the Finder. The Finder gives you a couple ways to see how much free disk space you have.

  1. In the Disk Utility app on your Mac, choose View > Show All Devices.

    Note: If you’re checking your startup disk or startup volume, restart your computer in macOS Recovery, select Disk Utility in the macOS Utilities window, then click Continue. If you check your startup volume (Macintosh HD), make sure you also check your data volume (Macintosh HD - Data).

  2. In the sidebar, select a disk or volume, then click the First Aid button .

    If Disk Utility tells you the disk is about to fail, back up your data and replace the disk—you can’t repair it. Otherwise, continue to the next step.

  3. Click Run, then click Continue.

    If Disk Utility reports that the disk appears to be OK or has been repaired, you’re done. You can click Show Details to see more information about the repairs. Otherwise, you may need to do one of the following.

    • If Disk Utility reports “overlapped extent allocation” errors, two or more files occupy the same space on your disk, and at least one of them is likely to be corrupted. You need to check each file in the list of affected files. Most of the files in the list have aliases in a DamagedFiles folder at the top level of your disk.

      • Gmail notification sound mac. If you can replace a file or re-create it, delete it.

      • If it contains information you need, open it and examine its data to make sure it hasn’t been corrupted.

    • If Disk Utility can’t repair your disk, or you receive a report that the First Aid process failed, try to repair the disk or partition again. If that doesn’t work, back up as much of your data as possible, reformat the disk, reinstall macOS, then restore your backed-up data.

If your Mac has a Fusion Drive and you see a flashing question mark or alert, see the troubleshooting section of the Apple Support article About Fusion Drive, a storage option for some Mac computers.

Mac

Chkdsk Mac

If you continue to have problems with your disk or it can’t be repaired, it may be physically damaged and need to be replaced. For information about servicing your Mac, see Find out how to service or repair your Mac.

Check Disk Mac Startup

See alsoErase and reformat a storage device in Disk Utility on MacAdd, delete, or erase APFS volumes in Disk Utility on MacPartition a physical disk in Disk Utility on Mac
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