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It's straightforward to run a check on your Mac with Disk Utility. If you're facing a problem with your startup disk, you'll need to run First Aid from Recovery Mode - we'll cover this in just a moment. After analyzing the disk directory, First Aid will determine if it can repair any detected damage. It has multiple built-in capabilities that can detect and repair errors. The First Aid function within Disk Utility can quickly check the status of your Mac disk, volumes, and external devices. Some folks really don’t like the thought of poking around in Disk Utility, but it’s simple to use and not a place to fear. What is the Disk Utility’s First Aid function? Here, we’ll explain how to run First Aid to fix possible problems on your Mac. These kinds of issues indicate there could be a problem with your Mac disk that definitely needs investigating. Is there any chance of data recovery? TIA.If you're experiencing these issues on your Mac, it might be time to run the Disk Utility’s First Aid function and repair your disk:įirst things first, if you're encountering any of the above items, it's time to backup your data before it's too late.

I used a different connector, and that didn't help. I unplugged it while the computer was off, and then restarted, and then plugged it back in, and that didn't help.

I tried restarting a few times, which did not help.

Upon restarting my computer, the Mac won't recognize my external hard drive in Finder or in Disk Utility. So, I manually shut it down with the power button. All applications stopped responding, force quit worked but the spinning wheel of death remained and couldn't open any new programs. Once I was finished with it, I clicked "eject" and the spinning wheel of death came up. original issue- I was accessing my perfectly good, relatively new external hard drive on my Macbook Pro. use the following 2 commands: diskutil unmountDisk /dev/disk2s2 diskutil eject /dev/disk2s2 Eject was successful! Unplugged it, replugged it back in, and eureka! All of my files safely stored. Identify the disk you would like to unmount (for me it was disk2s2) 4. SOLVED! For posterity for anyone who might Google this in the future, this is what works: 1.