Could not unmount disk.' If you look in the Console (/Applications/Utilities/), you will see an entry like this: Verify and Repair disk 'Storage.'Mar 18, 2016. 0 (or the previous two version of Docker), unable to resize the.If you try to repair a disk that cannot be unmounted, the repair will appear to start, but then stop as Disk Utility displays this message: 'Repairing disk failed with error. If necessary, recover lost data from the external hard drive with iBoysoft Data Recovery for Mac to avoid permanent data loss.In this tutorial, we are going to see how you can mount and unmount drives on your Linux system. Www 4life com.Summary: First Aid process has failed on external hard drive? In this article, we will tell you what to do if First Aid can't repair external hard drives, SD cards, USB flash drives and more. Solution 3: Repair the external hard drive with Disk Utility. Mac Os X Unable To Unmount Volume For Repair I have a Western Digital 500gb external hard drive, with 2 partitions, 'KAINARC' and 'JUNGLEMAC', connected to my Intelmac (Tiger 10.4.11 via my firewire, i have connected via usb but the problem is still the same).Mac First Aid Unable To Unmount Volume For Repair CostJust like the verify/repair commands in Disk Utility. Quit the installer and restart.' Unable to unmount volume for repair.Restoring the original state found as mounted. File system check exit code is 0. The volume Macintosh HD appears to be OK.To repair the startup volume, run First Aid from Recovery. 'First Aid found corruption that needs to be repaired. 'First Aid could not unmount the volume for repair. If possible back up the data on this volume. 'First Aid process has failed. What does that mean and what is the impact on my computer.
To those who have installed Mojave on APFS file system with a GUID/GPT Scheme (I suppose it will work even on MBR scheme), I have managed to 'fix' the 'APFS Recovery Volume' to make it bootable from any computer (capable of HighSierra and Mojave) with USB input devices (trackpad, keyboard, USB mouse and so on) responsive, working wifi. Click the Run button to start the First Aid. A sheet will drop down, asking if you wish to run First Aid on the selected device. Click the First Aid button in the Disk Utility toolbar, or select Run First Aid from the File menu. In Disk Utility's sidebar, select the volume, container, or physical drive you wish to use the First Aid tool on. Only when you are using the external hard drive as a startup disk and run First Aid to repair it, you could see the error message to ask you to run First Aid from macOS Recovery. What to do if Disk Utility's First Aid has failed on external hard drives? 3. What does First Aid do in Disk Utility? 2. This post will help you solve the First Aid not working problem and recover lost data from the troubled external hard drive.Table of contents 1. Command-line can be used to eradicate 'Can't unmount disk' from Mac.Don't worry. Terminal application allows you to control your Mac operations via the command prompt. Method 3: Use the terminal application. We have concluded three methods for you to try one by one, hoping they can repair the corrupted external hard drive successfully without losing data. What to do if Disk Utility's First Aid has failed on external hard drives?Generally speaking, if you can't run First Aid on an external hard drive to repair it, the solutions left for you to repair the corrupted external hard drive on Mac are limited. It has the capability to detect and repair the damages to partition map, master directory block, device driver and so on.But why Disk Utility's First Aid would fail on external hard drives?Most of the time, First Aid's failure on external hard drives is due to severe disk corruption which was brought about by improper ejection, physical damage, virus infection or other reasons.In the next section, you will learn what to do if First Aid repairing process has failed on external hard drives. What does First Aid do in Disk Utility?First Aid in Apple's Disk Utility is a small utility designed to verify and fix minor problems of a drive, such as repairing the drive's data structures, fixing external hard drives not mounting on Mac, external hard drive not readable on Mac and so on. FSCK command can be run to repair a boot disk or a non-boot disk. It can check the file system and try to repair the damages it finds. Solution 2: Run FSCK command from Single User ModeFSCK (File System Consistency Check) is Mac and Linux version of CHKDSK command in Windows. If you are receiving a constant result saying the process has failed, you can move to the next solution. Therefore, there might be a hope that it works after you rerun it. First Aid will try to verify and fix the content on the selected volume every time. How to play gameboy emulator on macSolution 3: Reformat the external hard driveIf you have encountered the First Aid operation failure when trying to fix external hard drives and neither of the solutions above works, the disk is probably severely corrupted. If your external hard drive is still not working properly after you reconnect it to the Mac, proceed to the last solution. Remember to replace disk3s2 with the Device name of your external hard disk too.Step 6: Wait until the checking and repairing process is completed and run reboot command.Hopefully, the command has helped you fix file system errors on your external hard drive. For example, type fsck_msdos for FAT file system and type fsck_exfat for exFAT file system. In the picture below, the file system in Mac OS Extended (HFS) and Device name is disk3s2.Step 2: Restart your computer and hold down Command + S keys to boot into Single User Mode.Step 3: Release the keys until you see white text appears on the startup screen.Step 4: Wait until you see root#appears at the bottom of the text.Tips: Remember to replace 'hfs' with the file system on your external hard disk. You need to exit the operating system and reboot into Single User Mode.Tips: You won't be able to see this article when you are running FSCK command, so we recommend you write down the steps below especially the command lines for your convenience.Follow the steps to fix the corrupted external hard drive using FSCK command:Step 1: Go to Disk Utility, select the corrupted external hard drive, and remember the file system and Device name. Unable To Unmount Volume For Repair Software Comes ForIn this situation, data recovery software comes for help. But before that, you'd better back up as many files as possible to another drive, just as Disk Utility suggested.However, you probably won't be able to back up your files directly from the seriously corrupted external hard drive. Those are the main factors that cause disk corruption, so to reformat a disk can solve almost all disk problem you may come across. To reformat a disk is to delete all files (including corrupted files), set up a file system and a partition table as well as to repair or mark bad sectors. Go to Finder > Applications > Utilities > Disk Utility.2. Go through the recovered files and make sure all desired files are back.Step 2: Erase/reformat the external hard drive in Disk Utility1. Select what you want to get back and click Recover.5. Double-click the found files to preview after the scanning process finishes.4. It could happen to any external disks including pen drives, SD cards, memory sticks, etc. ConclusionDisk Utility's First Aid repairing process doesn't fail on external hard drives only. You have to send it to a local service center or replace it with a new one. Provide the required details including a name, a format, and a scheme.If the external hard drive still doesn't work on Mac after reformatting, it's very possible that the external hard drive has been damaged physically. This error can occur due to various reasons like disk crashing, unmounting error, partitioning, and others. Proven solutions Mac First Aid Unable To Unmount Volume For Repair IphoneCouldn't Unmount Disk/Volume for Repair Error on Mac? 4 Ways to FixMac and its features are excellent unless a data lost and deleted files mess up.
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