How to Resolve the Unmount Error with a USB Boot Drive The above steps did the trick and everything was working again as expected. new versions of Mac OS X. This will not work if the error was triggered by attempting if you plan on formatting and erasing the disk to you are force ejecting anyway.
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- How to Resolve a “Couldn’t Unmount Disk” Error in Disk Utility?
- Cannot mount external hard drive on Mac, how to fix?
- How to Resolve a "Couldn't Unmount Disk" Error in Disk Utility? | OS X Tips
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Disk Copy Pro. Summary When an external hard drive becomes inaccessible or unrecognized on your Mac computer, check it in Disk Utility.
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- 1. Connect Your Drive and Check /Volumes/?
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How to Resolve a “Couldn’t Unmount Disk” Error in Disk Utility?
You should see at least two, sometimes three, entries for your drive depending on how it is formatted. The non-indented entry is the physical disk which typically has Media in the name. Selecting this entry should resolve most formatting issues. The indented entries are the volumes. This is important because when erasing the drive you will get different options depending on whether you have the volume or disk selected.
Which is why selecting the non-indented entry is important when formatting the drive.
Cannot mount external hard drive on Mac, how to fix?
What is that This is typical and not an issue when using the drive as NTFS. For more technical information see Microsoft documentation - here. If you plan on using the drive for Mac only then you will want to erase the disk. If you will be going between Mac and Windows then there should be no issues. Apple requires at least MB for this volume which is why this error occurs. For more technical information see Apple documentation - here. There maybe other ways to resolve this issue but the easiest way is to erase the disk and set it up with a GUID scheme. This will delete all existing volumes which will allow Apple to create their volumes with the correct amount of space.
Remember if GUID is not an available option then Show All Devices in the upper left is not selected as shown in the beginning of the article. Why is the partition button grayed out? This was first seen in macOS If you hover over the partition button you can see the tooltip provided by Apple. The drive was still invisible to Finder and Disk Utilities.
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A bit more digging revealed the drive could be seen in System Report via Apple logo on menu.. About This Mac..
How to Resolve a "Couldn't Unmount Disk" Error in Disk Utility? | OS X Tips
System Report. I could at least see the drive in Disk Utility now. Ok — no problem. Next step then was to force it to unmount from the command line. Opening the terminal and typing:. This will list all your drives.