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 Fix external hard drives not mounting issue 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. It’s important to keep in mind that if you run the eraseDisk command, the target disk is going to lose all its data, so make sure you are erasing the proper disk.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. The syntax is going to look like this: Diskutil eraseDisk JHFS+ Empty /dev/disk5s2 Let’s say the disk I want to erase has “/dev/disk5s2” as its identifier and I’m going to use Mac OS Extended Journaled (JHFS+) as the system format type and name it “Empty”. This is the syntax we need: Diskutil eraseDisk FILESYSTEM DISKNAME DISKIDENTIFIER Then pick a name and a system format type. Once you have found the proper drive to erase, just copy its identifier so you can use it for the next command. This is going to list all the mounted drives on your Mac. Start off by running the following command in the command line: Diskutil list Here I'll show you how you can erase and format a disk using the command line. To do that, the only thing you need is a bit of precise syntax to make sure that you are erasing the proper disk. But some Mac users might need to erase them from the command line on Mac OS. Most users use Disk Utility to erase a disk or hard drive.

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