Hard drive format error mac

The disk does not show up in Finder but I can see it in Disk Utility. When I try to erase it from there I get. I've tried running a surface scan in Techtools Pro, it processed blocks and all were bad. I cancelled the operation cause it was very slow.

How to force a Hard Drive to unmount for formatting in Mac OS X Disk Utility

You'll need to change diskX to whatever the number is for your drive. You can find that out in disk utility, select the drive, click info, and look under 'BSD device node'. This made the troublesome drive's item in the sidebar become an item of larger item sorry my vocabulary sucks.


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In disk utility Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Select the volume you just created this is the sub-entry under the drive entry from the left side list. Click on the Erase button. Where X is a number.

Disk Utility Errors and Questions for macOS 10.11 and higher

First run sudo diskutil list to find the relevant disk3, etc - check the size and make sure it's the right disk! Sounds simple, but first boot after an OS upgrade or with a failed disk mount due to timing problems, and the system can get confused. A reboot sorts this out.

Started the mac, and all was well: reformatted and on its way. On the left hand side of your finder, check the list of devices that are mounted. There may be more than one disk mounted. Eject all the mounted ones except for the one that you have to format. Now go to disk utility, select external hard drive and erase.

This should work. I was having exactly the same problem as described above; unable to reformat my 16GB USB after interrupting an "erase free space" command. The command will force a reformat--of course any data will be lost, but your drive will be usable.


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  • 1. If Your Drive Is Blank.

I simply selected it and formatted it and voila! It mounts and works!

15 Worst Mac Hard Disk Drive Problem with Solutions

The only solution for me was to format this USB drive on Windows. Also, the Quick Format didn't seem to work, I had to performa a standard format who took very long. I don't understand what happened to the drive to be honest, I never had any error when formatting until now.

Mukhtar Jafari is the CEO of wikigain. He would like to share his experiences with IT enthusiast via this blog. When I try First Aid it completes and says there are no issues. You have helped solve a very frustrating dilemma. The most important step was to select the whole drive not the volume!

Your email address will not be published. Notify me of follow-up comments by email. Notify me of new posts by email. This happened to me, too. The screenshot shows that you should delete one level lower in the hierarchy than actually works. Hi, someone could already solve this problem?.

If you need help:

I bought two WD Elements discs and the same thing happened to me. I already tried to format it in an PC with Windows, but it does not see it.


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You should see it succeed now. Thank you.

Format a USB Drive to FAT32 on Mac: All You Need to Know

That was exactly it. Problem solved.

How to solve it

You need to select the disk name one level higher. Support Downloads Knowledge Base. German Spanish Italian French. HGST Support. Error message when formatting a new drive WD External Drives.