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. By this means, you can make use of USB boot drive. At this point, you can try solving it with Recovery Partition.
What to do when a hard drive won’t unmount in OS X El Capitan
Moreover, you can also attempt to eradicate this error, forcing unmounting disk by command line. 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.
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Shirley Zhang is a data recovery expert in DataNumen, Inc. For more information visit www. Data Recovery Blog Discuss every aspect of data recovery. Apple is so frustratingly complicated, I spent three full days just backing up simple, straightforward photo files. Jan 12, At , Friday, this is the situation: Trash cannot empty, error code I backed up my files from 2tb Samsung into another older external HD.
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Used Terminal to force empty trash without success. I tried erasing Samsung HD, that also failed. I gave up.
Next time, I'll get a simpler computer that can do a straight forward job. External Hard Disk won't unmount. More Less.
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Communities Contact Support. Sign in. Browse Search. Ask a question. User profile for user: The above error may also be triggered due to first Aid or while formatting a non-boot partition. In this case, a resolution of the problem occurs with the Recovery Partition, which comes with all the newer versions of the Mac OS X.
However, this is not applicable for the modification of the boot disk with the help of partitions or formatting. Then the resolution lies in the previous method. Otherwise, we follow the steps: This will not work with the disk that is throwing the error is the same as the primary boot partition.
The solution lies only in using a separate USB drive for fixing the error. Vishal is a data recovery expert Stellar addressing several data loss scenarios on a macOS system. He loves to read autobiographies and his personal favourite is of Steve Jobs. View More. Please help me recover as the SSD contains important projects and documents.
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I suggest you to install Stellar Data Recovery Professional for Mac to recover your important documents and to avoid any data loss risk. The software scans your unrecognized SSD and list all the recoverable files. To save the files, you need to register the software. Leverage Stellar Mac Data Recovery and you can recover data from unmounted disk conviniently. Thanks for another informative blog. Where else could I get that kind of info written in such a perfect way?
Resolve a “Couldn’t Unmount Disk” Error in Disk Utility for Mac
Would you recommend some solution for data recovery? Yes, we have solution for unmounted data recovery on MacOS. You can watch the tutorial video and then download Stellar Mac Data Recovery to recover your files. Recently i bought it from my friend. Then i upgraded it to Mac OS high sierra successfully.
I installed it and tried many times to upgrade to Mac OS high Sierra. But failed to installed.
Disk Utility Tip: Fix 'Couldn’t Unmount Disk' Errors
After 5 hours of download, the installation requires the system to restart but the restart is failed. I am very depressed and stuck with the mountain lion. Did you try erasing the Apple hard drive via recovery mode? Once in Recovery Mode, you can go to Disk Utility and erase the complete hard drive to a single partitioned drive.
Just the solution I was looking for..