#MAC AT LEAST ONE VOLUME COULD NOT BE UNMOUNTED INSTALL#

Install and run the software from the Applications folder.

To format the drive with Stellar Partition Manager: You can also use this software to create a bootable DMG and load the system from it instead of the external drive. Formatting the hard drive or partition scheme will recreate a new HFS file structure on the hard drive, which will be free from cryptic errors. Use Stellar Partition Manager when macOS can not format, erase and repair the Mac hard drive or a volume due to the “couldn’t unmount disk” error. Stellar Partition Manager is an alternative to Disk Utility that allows performing various types of disk manipulations: create, hide, delete, resize and mount a volume. Fixing with Stellar Partition Manager Software For your convenience, we have structured instructions into step-by-step guides that are easy to follow. This includes using Stellar Partition Manager software, Disk Utility, or Terminal. There are several different ways to fix the “couldn’t unmount disk” error message on Mac.

#MAC AT LEAST ONE VOLUME COULD NOT BE UNMOUNTED HOW TO#

How to Fix “Couldn’t Unmount Disk” Error on Mac

#MAC AT LEAST ONE VOLUME COULD NOT BE UNMOUNTED FOR MAC#

Use Stellar Data Recovery Professional for Mac if you encounter any kind of data loss and are in need of a quick and easy data recovery solution. Make sure to use Time Machine or other third-party services to backup your Mac and protect your files. This becomes especially important whenever you try to fix any disk-related problems, including when you can’t unmount the disk on Mac. We all know that it is recommended to do regular Mac backups. Before Fixing the “Couldn’t Unmount Disk” Error

Trying to perform any drive modifications would fail to give you the “couldn’t unmount disk” error message. You are also unable to partition, reformat or erase the disk you are currently booted from.

The system won’t allow you to do anything if some other application or process uses the drive. Why is Mac Giving You the “Couldn’t Unmount Disk” ErrorĬan’t unmount disk on Mac usually happens when you try to do some manipulations with the external or internal drive. How Do I Fix an External Disk that Won’t Unmount?.How Do You Unmount a Disk on a Mac the Right Way?.

How to Fix “Couldn’t Unmount Disk” Error on Mac.

Before Fixing the “Couldn’t Unmount Disk” Error.

Why is Mac Giving You the “Couldn’t Unmount Disk” Error.

Back up as many of your files as possible, reformat the disk, and restore your backed-up files. If you have any idea to get the HDD working or even safe the files, I would be really grateful.Īlmost forgot about this from Disk Utility:ĭisk Utility can’t repair this disk. This was the try: $ sudo diskutil eraseDisk JHFS+ DISK_VOLUME disk1īut it didn't work as well. Than for each disk: $sudo diskutil unmount force disk1snīecause I wasn't able to do anything with my external HDD I made a desperate attempt to erase everything on it, including unbackuped files, cause this used to be the backup plan. Gave this: Forced unmount of disk1 failed: at least one volume could not be unmounted If I open it in disk util I sometimes see an actual name of a partition, but most likely it's not the real name.Ģ: Apple_HFS Macintosh HD 140.0 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3Ĥ: Microsoft Basic Data BOOTCAMP 110.1 GB disk0s4Īnd then to unmount this: $sudo diskutil unmountDisk force disk1 My 1TB LaCie Rugged THB decided it was a good idea to stop working all of a sudden.

Mac at least one volume could not be unmounted