So, we recommend you to have a Mac data recovery software by your side to get back the lost data. Take a free trial of Stellar Data Recovery for Mac to see how it can actually help you in various data loss situations. The user often experiences a problem, while handling some of the Macs, when they are not allowed to repair permissions or directory in Disk Utility. They are unable to erase or partition the drive. The error, which is thrown, is the:.
The error occurs in such situations like formatting Mac as well as partitioning and verification and repairing of Mac disk.
The reason for this error is the modification of the boot drive, or it is being used by some other process or application.
If the internal drive is causing the issue because the OS X Recovery exists as a partition on the physical disk, unable to modify or unmount the internal drive, then the preference must be given to a network drive or an external drive. Disk Utility can be run from the external drive.
The version of the OS X does not matter, by at least must be The one and only requirement are that Disk Utility must reside on the 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. This is the most recommended method to repair the error. Any OS X boot drive is needed to complete the task. But, the important point to remember is that the installer or the recovery drive must reside in the drive, separate from the primary boot disk with the installed OS on it.
The above steps offer a resolution of the problem. The errors could have been unresolvable without a boot drive. Therefore, a bootable thumb drive was a good option. For the older Mac OS X like 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. Imagine how will you access the, videos, documents like spreadsheets etc. Thankfully, advanced software such as Stellar Data Recovery Professional for Mac can help you recover data from an unmounted external hard drive. Once you have activated the Mac recovery tool you can recover as many numbers of files from any given external drive or SSD.
Vishal is a data recovery expert Stellar. He addresses data loss scenarios on a Mac. He intends to help people solve their macOS problems. Besides, Vishal prefers to read about astronomy and autobiography, and his favorite is Steve Jobs - The man who thought different written by Karen Bluementhal. I get an error message stating no packages were eligible for install. It restarts over and over again. This should force unmount the entire physical disk and all its related volumes:.
Be sure you backup your files to an external drive or second internal drive, the following procedure will remove everything from the hard drive! We are now going to force erase the physical disk, creating a single Mac OS Extended Journaled volume. This should then allow you to partition and work with the physical disk again. This should force erase the entire physical disk and all its related volumes, then create a single Mac OS Extended Journaled volume:.
Disclaimer: While the author has taken care to provide our readers with accurate information, please use your discretion before acting upon information based on the blog post. This feature has been tested using OS X v Apple Authorised Mac and iPhone Repairs.
Then select the desired external drive from the startup manager screen and press the enter key. Also perform a permissions repair if required. This should force erase the entire physical disk and all its related volumes, then create a single Mac OS Extended Journaled volume: 3 Hopefully you can now perform your desired erase, partition, installation or deployment on this drive. Terminal application allows you to control your Mac operations via the command prompt.
Command-line can be used to eradicate 'Can't unmount disk' from Mac. Step 2: Then, type "diskutil list" on the command prompt to get the list of all the disks on Mac. Step 3: Now, search for the disk you want to force unmount. Recovering the Partition method is used to recover the disk error while formatting a non-booted partitioning or by First Aid. However, this method will not be feasible if the disk and the primary boot partition is at the same location.
With repair partitioning, you can unmount the disk for repair. In case all these methods fail to repair the disk, you can use Recoverit to retrieve the data. Recoverit Mac Data Recovery is a one-stop solution to recover all the deleted, or lost files on Windows and Mac. For the selection of a specific device, you will need to select the specific drive under the tab "Devices'" or Desktop under the "Select Location" tab.
Once the previous step is completed, Recoverit will automatically start an all-around scan that will help to find all the lost, deleted, or formatted data on the disk. Once you have found the data that you were looking for, you can either pause or even stop the scanning process. Recoverit allows previewing the recovered files via thumbnails, preview button, double-clicking a single file, or by toggling between the two preview angles. To recover selected data, you can preview it first and then retrieve it.
To recover the files, select the targeted files and click the 'Recover' button to retrieve your data back. Do you know Mac provides a Disk Utility application found under the 'Utilities' folder to manage internal disks and external storage devices? Using disk utility, you can partition Mac's hard drive without creating any special bootable tools. Step 3: Double-click the 'Utilities' folder, and then double-click Disk Utility to access it.
To check and repair file system errors, Disk Utility provides a First Aid function. You can even use the First Aid function as a preventive measure. Step 2: Following the first step, you need to insert the DVD and restart your computer.
Step 4: You can select the volume that you need to repair from the left column and then you can click on 'First Aid' tab from the right. Step 6: Click on 'Repair Disk' to repair if there are any errors or problems found while checking for errors in the previous step.
0コメント