Mac os x disk utility cant unmount

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Contents:
  1. Disk utility tip: Fix ‘couldn’t unmount disk’ errors
  2. How to Fix "Couldn’t Unmount Disk" Error on Mac?
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The HDD has been acting up recently, very slow performance, bad behavior etc. Tech Tool Pro and Disk Utility don't seem to be able to fix the drive, so I decided to wipe the data by a reformat and writing zeros to the entire drive.

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Everytime I try and format, it tells me that the drive cannot be unmounted. I have rebooted a few times, and spent days running everything from TechTool Pro on it and it won't go.

Disk utility tip: Fix ‘couldn’t unmount disk’ errors

Any thoughts on how to get it to unmount and reformatted? Is there a way in Terminal to do this instead? However, since you are erasing the drive anyway, this doesn't really matter in your situation. When a disk is first connected, macOS helpfully tries to run fsck on the volume.

If the volume is large or has extensive problems, this process can run for a long time before it fails. If you have a PC download transmac trial start in administrator mode plug your disk in via usb. Locate your drive and right click on it.


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If you have an image you would like to clone to it use the clone option. You cannot erase a disk that you are booted on. There should be a Recovery Partition, a "hidden" Partition from which you can format the boot disk. Attention after that you can install os from the recovery Partition.

How to Fix "Couldn’t Unmount Disk" Error on Mac?

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I have two internal drives in my 27" iMac Couldn't unmount disk Any thoughts on how to get it to unmount and reformatted? Kray Kray 1 1 4.

Actually I think the reasons are different: The symptoms unable to unmount and the solution force unmount are probably the same though. You can force unmount a drive by running the following Terminal command: Apple - please make your GUI stronger. Didn't have a volume to unmount; unmounted the disk device instead with N being 3 in my case: Follow the steps below:. You should find and choose a reliable and experienced one that can help you perform the original task without such an error.

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. Shirley Zhang is a data recovery expert in DataNumen, Inc. For more information visit www.

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Data Recovery Blog Discuss every aspect of data recovery. Enter your email address to subscribe to our company's newsletter. RSS Feed. Resolve with USB Boot Drive If this error occurs in that the disk to be modified is the boot drive, the simplest solution is to boot the Mac system from another drive and then run Disk Utility on the disk. First off, insert the USB boot drive to Mac and reboot. Lastly, just perform the original task on the original disk.

For a start, reboot your Mac.


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  5. Next, access Disk Utility from the boot menu. Solve with Command Line Moreover, you can also attempt to eradicate this error, forcing unmounting disk by command line. Follow the steps below: To begin with, you have to access Terminal application.