Fix external hard drives not mounting issue on Mac Now, let's make the external disk accessible on Mac. If not, recover important files from this unmountable external hard drive first to avoid data loss. Check if you have a copy of a data backup. Any further operation is very likely to overwrite your original files and make them unrecoverable.ģ. Do not run First Aid to directly repair the disk if you didn't restore data from it or back up it. Reformatting will wipe the data on this disk and cause serious data loss.Ģ.

Do not go straight to reformat this not-mounted external hard drive unless you've restored data from it or backed up it before. Dos and Don'ts When External Hard Drive Not Mounting on Macīefore you go further, it's better to know what you can do and can't do.ġ. Note: You need to save the recovered files to another usable drive.Īfter having successfully restored all data on this drive, you can set out to erase this external hard drive to fix the disk not mounting on the Mac issue. Knowledge Base: What does 'Mount' mean on Mac Why can't access the external hard drive on Mac Dos and Don'ts When External Hard Drive Not Mounting on Mac Recover data from an external hard drive that won't mount Wondering 'why my external hard drives won't mount on Mac'? This post explains the reasons and teaches how to fix this disk problem without losing data. I can't do First Aid as my LaCie external drive does not mount on the MacBook Pro. The main drive is greyed out in Disk Utility and the partition is not showing up. Now after updating, macOS is not mounting this external hard drive. 'I have a 500 GB LaCie external hard drive, formatted as macOS Extend journaled on MacBook Pro 2014 and I have been using it to do Time Machine backups.

So, it's annoying when you find that your external hard drive is not mounting for the error or not recognized by your Mac, just like the user below. Usually, an external hard drive will appear (aka mounted) automatically on your Mac once you plug it in, and you can access data on this drive.

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