Actually seriously consider booting Ubuntu or some other nonMac OS X operating system to reformat the drive that way first, and then use Disk Utility to format the drive back to HFS+ and reinstall OS X.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. 70 thoughts on Fix for disk erase failed couldn’t unmount disk Randall says: Jat 9:12 am. Quick steps outlook for mac 2016.Mac First Aid Unable To Unmount Volume For Repair IphoneMac users like you already know that First Aid on Mac might help fix some disk problems when the disk is not working properly. Mac First Aid Unable To Unmount Volume For Repair Cost If unable to unmount drive on Mac diskutil list then press return and look for the disk identifier and enter the following command with the disk identifier. 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 Service Method 2: Recover lost data from the disk that Disk Utility can't repair If you don't have an extra external drive in hand or you can't back up files from that disk with Time Machine for some reasons, alternatively, you can recover files with reliable data recovery software, likeiBoysoft.
Unable To Unmount For Repair Code Is 0Should I be concerned that the volume could not be unmounted. Restoring the original state found as mounted. File system check exit code is 0. The volume Macintosh HD appears to be OK. Checking volume information. During the running of First Aid on an external hard drive, one of the following error messages may pop up indicating First Aid operation failure:Checking volume bitmap.'First Aid could not unmount the volume for repair. If possible back up the data on this volume. 'First Aid process has failed.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. Click Done to continue.'Note: Help me please mmd for mac. To repair the startup volume, run First Aid from Recovery. 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. 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. ConclusionFirst of all, let's take quick look at what First Aid can do in Disk Utility. What to do if Disk Utility's First Aid has failed on external hard drives? 3. 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. 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. The simplest and most efficient way is to reformat the corrupted external hard drive to make it workable again. Solution 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. Office 2016 for mac change product keyIn addition to external hard drive data recovery, it is also a tool that supports USB flash drive data recovery, SD card data recovery and so on. It is able to recover deleted or lost data from unreadable/unmountable/formatted/corrupted external hard drives. Mac First Aid Unable To Unmount Volume For Repair CostStep 1: Recover as much data as possible with iBoysoft Data Recovery for MacIBoysoft Data Recovery for Mac is reliable external hard drive data recovery software for Mac users. In 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. Select what you want to get back and click Recover.5. Double-click the found files to preview after the scanning process finishes.4. The program will start scanning this drive for recoverable files.3. Select the external hard drive that First Aid failed to repair and click Next. Download, install and launch iBoysoft Data Recovery for Mac.2. This software is fully compatible with macOS 10.15/10.14/10.13/10.12 and OS X 10.11/10.10/10.9/10.8/10.7.Recover lost data from corrupted external hard drives with iBoysoft Data Recovery for Mac1. 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. As a result, if you come cross First Aid operation failure on any external disks, this post can still be very helpful. 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.
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