One of the simplest fixes when a disk won’t mount on a Mac is to try remounting it through Disk Utility. To check if that’s the case – and fix it – follow these steps:įix #2: Remount External Disk in Disk Utility It’s possible that your disk drive is simply prevented from showing up in your system settings. Fix #1: Change macOS Drive Display Settings Make sure to take a structured approach to this and note your results. Not all of them will work, and sometimes you might not reach a solution in the end. In order to fix a hard drive that won’t mount on a Mac, you should try the following steps. How to Fix Your External Hard Drive Not Showing Up on a Mac For more information visit 1: Change macOS Drive Display Settingsįix 2: Remount External Disk in Disk Utility Shirley Zhang is a data recovery expert in DataNumen, Inc., which is the world leader in data recovery technologies, including damaged mdf and outlook repair software products. Based on your own case, you can opt to ask the disk repair shop nearby for help or search and contact the online disk repair service. Of course, if all means mentioned above can’t rescue you from the annoying error message, your last resort is to ask professionals for help. You should find and choose a reliable and experienced one that can help you perform the original task without such an error. Also, it’s pretty easy for you to find third party tools for formatting, partitioning or modifying disk. What’s more, fortunately, there are a lot of repair utilities dedicated to fixing this error on today’s market. Replace the “/dev/diskx” with the correct disk number, such as “/dev/disk1”. Lastly, you should type “sudo diskutil unmountDisk force /dev/diskx” line.At this time, you ought to find out the disk that you want to force unmount.Then, input the “diskutil list” line, which will list out all the disks on the Mac.To begin with, you have to access Terminal application.Moreover, you can also attempt to eradicate this error, forcing unmounting disk by command line. Lastly, select “First Aid” to re-verify the disk or choose “Erase” to format the disk at your will.Next, access Disk Utility from the boot menu.Then, when booting, hold down the “Option” key to select Recovery Partition.At this point, you can try solving it with Recovery Partition. If the error message appears during “First Aid” or formatting a non-boot disk, the above means will not make effects surely.
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