Partition failed couldn’t unmount disk

When it comes to our computer, everything works perfectly. However, at some point in time, we run into the famous Partition failed couldn’t unmount disk message. As a result of this error, there is no way to eject the hard drive and this is because it is used by the operating system and there should not be any intervention on our part.

If your hard drive does not work well, or you just want to know more about the features you have in case of an accident, today we tell you how to use the Disk Utility to check and repair the hard drive in macOS. One of the basic functions that we should all know is given by the “Disk Utility”. 

One of the basic functions that we should all know is given by the ” Disk Utility “. This is essential to verify and repair the hard drive in macOS when we encounter various problems such as poor writing or inconsistent operation of our Mac. You can easily solve this unmounted the disk error on your macintosh hd OS.

This is essential to verify and repair the hard drive in macOS when we encounter various problems such as poor writing or inconsistent operation of our Mac.  You can easily solve this unmounted the disk error on your macintosh hd OS.

There is no problem when you have a bad partition. The partition simply appears, and in many cases, it is not considered as a problem. This can occur, but it usually occurs due to erroneous actions made by the user, such as deleting a file or partitioning without following appropriate procedures, or partitioning without programs designed for the task. Never worry; in most cases it can be repaired  with only a few steps.

Also See command line

How to check and repair disks in macOS

if the Mac is unable to access data on an external drive or partition, the problem could be associated with your hard drive. In this article, we will use disk utility in macOS and recover the disk, format disk or partition. For such problems and errors, logic clearly dictates that you need to repair disk errors first to get closer to the root of the problem.

So today we are going to discuss this issue and teach you how to use this simple tool. First of all, some notes:

  • Disk Utility performs a function called ” Direct Verification “, that is, a check that does not need to be performed from another volume
  • To perform the repairs you will probably need to reboot and then perform the verification and repair from the boot disk or another volume
  • Direct verification only works on volumes in the HFS + J file system (Mac OS Plus with registration), that is, with a re-
  • During a direct check, the Mac may run slowly and stop responding correctly. It’s normal
  • Once direct verification is initiated, we may not be able to cancel it, depending on what you have advanced
  • If there are alerts of ” Incorrect size of the temp file “, we can ignore them without problem
  • You can not verify or repair disks that can not be mounted , it is better that you do not try it
  • Discs that can not be disassembled can not be repaired

Check and repair hard drive in macOS

Once we have all this clear, we will see in what situations we must proceed. First, we will try to verify and repair the hard drive in macOS when we encounter problems and erratic, nonsense behavior of our Mac, when it hangs several times or shows serious errors. In that case what we have to do is the following: 

  1. Open Disk Utility using Command + Space (CMD + Space) and typing Disk Utility or from Applications / Utilities
  2. Once inside, select either the partition we want to verify or the entire hard drive. This will verify the parts in HFS + J, so we will not be able to verify a partition with Windows, for example
  3. Click on ” Verify “

Remember that we can ignore messages that speak about the wrong size of the temp file. We will look for a message similar to the following: ” Error: The underlying task has registered a failure in output 1 ” or ” The volume must be repaired. “Which are indicative that we do indeed have a problem. The seriousness of this can be varied so we will try to repair it as follows:

  1. Restart or start well with the boot disk and pressing ” C ” or with Lion or above, using the Recovery System or Internet Recovery
  2. If you use a recovery partition or Internet Recovery, select the Disk Utility in the ” Utilities ” window . With an installation disc, without pressing continue, select Disk Utility from the installer menu
  3. Once inside, in the ” First Aid ” tab we click on the triangle to the left of the hard drive icon to see the names of the volumes and partitions of the disk
  4. We select the volume of hard disk of macOS that we want to repair and click on ” Repair “. Ready

The Disk Utility will then repair the hard drive in macOS whenever possible. There is the possibility of using fsck , a utility that works through the command line, but it is not advised. If at any moment it tells us to replace the disk, we will have to copy all contents immediatelyto anyone with macOS. (Tiger) Or higher as the Disk Utility works much better when checking and repair the hard disk in macOS . We will tell you on another occasion how to use the fsck correctly. 

If the error, during the verification or after the repair clearly explains that the hard disk is not repairable and we have to replace what we must do is proceed to do immediately, at the same time and without discussion, a backup as it can That we will not be able to start the disc again . 

Such problems can occur due to dry blows, usually, or to more complex technical problems but always end up in the worst way and usually without warning. Therefore we advise, again and again, that before having to repair the hard drive in macOS you have a good supply of backup copies to back you up. 

Repairing Disk Failed with Error Could Not Unmount Disk: Corrupted Mac Deleted The recovered data

Macintosh machines is one of the most advanced computing and offers several useful features that can be used for repair of failed disk with error could not unmount disk. In such a situation using Disk Utility or FSCK would be the most appropriate option in order to address this issue. With the help of Disk Utility you can fix damaged file system and corrupted data structure. But in case if you can not solve the problem, then the only option left for the disk repair that failed with the error could not dismount the disk, is to format the entire Mac hard disk.

Formatting the entire disk can Easily remove all problems behind the occurrence of this same error on your Mac system. However, it will also cause the removal of all important files from the entire disk drive but it will solve the problem completely as well. You can recover all your important files once the disk repair that failed with the error could not be dismounted the disk will be completely fixed on your system.

Fortunately Mac Data Recovery Software is there to recover all the lost after any kind of critical data loss situation. You can easily recover lost, deleted, formatted or inaccessible files in Mac OS. Therefore, it is recommended to use the Mac data recovery software to recover all files formatted disk and repair the error was not able to unmount the disk.

To Repairing Disk Failed with Error Could Not Unmount Disk

Although Mac macOS is fairly reliable, but still not free from glitches. Sometimes, users must also face Repairing Disk Failed with Error Could Not Unmount Disk issues unexpectedly. It’s an issue that continues to worry regardless of Mac versions that you could use. 

Finally, as a result, the Mac system can not process your entire request and can crash. What else because Repairing Disk Failed with Error Could Not Unmount Disk problem, users also have to face some difficulties when accessing your files on the hard disk and other installed applications, which actually press a panic button sometimes. 

Hope it is not the end, But also reported that the system processing speed can be slow and even terminate abruptly, which can result in the total loss of data saved in the mac.

 If you are also in the same situation and looking for Repairing Disk Failed with Error Could Not Unmount Disk Solution, then you need not worry because you will find complete guide to fix Repairing Disk Failed with Error Could Not Unmount Disk problem.

Repairing Disk Failed with Error Could Not Unmount Disk: What Causes For Data Inaccessibility | 

There are several reasons behind the emergence of Repairing Disk Failed with Error Could Not Unmount Disk creating panic situations. Inconsistencies related to the Mac OS file system can lead to data corruption so it is completely inaccessible. Let’s look at some of the likely reasons for it.

Human Errors: This may be due to unintentional errors such as accidental deletion, formatting of mac files and volumes during the normal course of operation

Empty Trash: Many times users can empty their trash files without cross checking them, which could result in complete data cleansing, even important Mac data.

Sudden system termination files: at some point because of the power overhead, Mac system is abruptly terminated, because some of the files can not be mounted and stop responding.

Interrupted read / write operation of:. The possibilities of Mac’s file corruption or deletion also takes place when we interrupt the course read / write process midway resulting in Repairing Disk Failed with Error Could Not Unmount Disk situation.

Unintentional Formatting: Pressing the wrong button will at some point lead to the appearance of very critical Repairing Disk Failed with Error Could Not Unmount Diskproblem.

Virus Attack: Although Mac is considered much safer compared to Windows but still few nasty viruses are being written for it. The downloading of applications and other related files will lead to the security issue, which further influence the entire file system.

Modification in BIOS Adjustment: At some point when we go to some changes in the BIOS Sector it will lead to the occurrence Repairing Disk Failed with Error Could Not Unmount Disk problem that you would never like to have.

Corruption in the header file: Header file are one of the file that contain important information especially in the file to be accessed. Therefore, if there is a problem the requested file is not responding and even generates Repairing Disk Failed with Error Could Not Unmount Disk messages corruption.

Catalog Files Corruption Node: Catalog is the system-generated file that records the file types and their recent type accesses.

Problem with boot sector : When there is a problem with the boot sector, Mac system fails to load and as a result can not access stored data files and there is no problem .

Kernel panic issues: like BSOD in Windows, Mac users might come across kernel panic issues.

Improper installation of program: installation of unwanted applications and programs without checking their source

Hardware or software theme: It is also a common factor that is quite responsible for Mac file corruption and appearance of erroneous situation.

All of the reasons mentioned above are the likely causes of inaccessibility of mac data. Now a question arises that, how does a novice know user about Repairing Disk Failed with Error Could Not Unmount Disk Issue ? Well, for its viability here are some of the common symptoms. 

Symptoms Related to Repairing Disk Failed with Error Could Not Unmount Disk Subject

  • The system will automatically terminate after a few minutes of work.
  • Slow and Slow Mac System Behavior
  • The stored Mac file is damaged or corrupted without any warning
  • Installed programs get crashed or freezes frequently
  • The appearance of annoying error messages like “can not be found. Dmg “,
  • “File not Found”,
  • “Access denied”,

Precautions and Tips to Avoid Repairing Disk Failed with Error Could Not Unmount Disk

There is a well known proverb that caution is better than cure, this is also applicable in the case of Mac data. In order to avoid the Repairing Disk Failed with Error Could Not Unmount Disksituation and keep all Mac files safe And safe, following tips can be helpful. So, let’s take a look.

  • Stop using Mac immediately if you do not want to aggravate Repairing Disk Failed with Error Could Not Unmount Disk issue and go for the built-in disk recovery option.
  • Never overwrite the free space created after deleting Mac files.
  • Do not restart the Mac since deleted or corrupted data could be overwritten with some other file.
  • Do not abruptly shut down the system.
  • Avoid updating system files.
  • Do not share the new data after the removal or editing of the corruption.
  • Search for deleted files in the trash
  • Avoid downloading software from untrusted or suspicious websites.
  • Always turn off the PC properly.
  • Always keep your Mac system updated with patches and fixes.
  • Security to protect against software gaps
  • Always have an adequate and up-to-date backup of your saved Mac files to overcome the data loss and repair problem.

At this juncture it has been commonly seen that most users may lose their hope and attempt in some expensive procedure to repair the problem. But why do it! If here is an effective solution for it.

Repairing Disk Failed with Error Could Not Unmount Disk : Manual Method to Get rid of It

In the case of Mac file corruption resulting in Repairing Disk Failed with Error Could Not Unmount Disk Complications, please follow the following: Couldn’t unmount disk external hard drive, disk erase failed couldn’t unmount, secure disk erase failed couldn’t unmount disk

  • Search and launch ” Disk Utility “
  • Click on the ” check file system “
  • Wait for the scanning process
  • Select the file you want to mount

If there is a problem with the Mac file system because Repairing Disk Failed with Error Could Not Unmount Disk then you can try this

  • Insert the CD / flash drive Mac boot and restart the PC.
  • Click the “Install Mac OS ” option.
  • Continuously press “C” button from the keyboard.
  • Accept the license agreement and select the desired language.
  • Choose the driving destination that has the problem. In general, click “Macintosh HD”.
  • After you click on the “Options” icon to select the installation method. In addition, if you want to save your personal files folders, accounts and network user accounts, click “File to install” and select “Keep users and network settings.
  • Restart the Mac system and answer the configuration prompt.

Note: If you try to fix Repairing Disk Failed with Error Could Not Unmount Disk manually requires technical skills which beginner lacks. Even the slightest mistake could bring risks to the data. Therefore, it is recommended to have the help of Mac data recovery tool to rescue the data in case of Repairing Disk Failed with Error Could Not Unmount Disk issue.

Mac Data Recovery Software: Automatic Way to Resolve Repairing Disk Failed with Error Could Not Unmount Disk Subject

Undoubtedly, Mac data recovery software is a very simple and reliable tool that rescues the data in case of your loss. It has also been noted that, the tool is very effective in all cases of non-data loss situation, regardless of the reasons behind the problems of corruption or elimination. Apart from that, its robust recovery algorithm performs the complete scan of all Mac hard drives either its internal or external and provide users with optimum results.

In addition, Mac data recovery software has been well developed with the layman’s perspective to provide simple working environment for beginners as well. Another feature of this same software is that it can be easily installed and operated with minimal use of system resources. In addition, due to all these efficiency and meritorious work in the field of data recovery, the tool has won 8 of the 10 awards worldwide. Do not delay any longer, there is nothing as good as Mac data recovery software. Just download and install it to fix Repairing Disk Failed with Error Could Not Unmount Disk theme.

Mac Features Data Recovery Software

Undelete Mac Data: Reliable and advance tool to perform smooth data recovery / Mac files during Repairing Disk Failed with Error Could Not Unmount Disk situation.

  • Developed with robust scanning and recovery algorithm to provide complete Repairing Disk Failed with Error Could Not Unmount Disk solution.
  • Highly applicable in case of Mac data corruption / removal matter

Deleted volume recovery : Also works effectively in case of Mac system file corruption situation

  • Enabled with advanced built-in record search and retrieval features in one click

RAW File Recovery: Supports recovery of over 300 popular

Files including spreadsheets, ZIP files, RAR files, PPT files, PSD files, RAW files, music files, videos, etc.

Lost partition recovery : Safe data recovery from NTFS, FAT, exFAT, HFS, HFSX based boot camp partitions

  • It works like the boot of the system in case of boot failure issue
  • Maintains and preserves data integrity
  • In addition, it will provide preview of scanned and recovered files along with the option to view the on-going scanning process during Repairing Disk Failed with Error Could Not Unmount Disk
  • Enable file format resume recovery. Dmg
  • Saves recovered files to the desired place of the user
  • It is profitable

System Requirements for Mac Data Recovery Software

  • Processor: Intel
  • Memory: 1 GB
  • Free space on hard disk: 50 MB
  • OS: macOS 10.9 Mavericks, mountain lion 10.8, 10.7 Lion, 10.6 Snow Leopard, 10.5 Leopard, 10.4 Tiger

Pros and Cons of Software


  • Very easy to use
  • Highly reliable
  • Scan and recover data all Mac hard disk regardless of the circumstances
  • The Best Way to Overcome and Fix Repairing Disk Failed with Error Could Not Unmount Disk


  • The demo version can only be used to preview the recovered files.
  • Licensed version is required to save the recovered data to the desired location.

Conclusion: Now there is no need to worry at all! It can be easily able to rescue Mac data regardless of the circumstances behind Repairing Disk Failed with Error Could Not Unmount Disk issue using reliable and sophisticated Mac data recovery software.

Repairing Disk Failed with Error Could Not Unmount Disk: Users Guide to Operate Mac Data Recovery Software

Step 1: Download and Install Mac Data Recovery Software to Resolve Repairing Disk Failed with Error Could Not Unmount Disk Theme.

Step: 2 , click ‘Quick Recovery’ under the ‘Drive Recovery’ tab.

Step 3: Select Mac Volume to Recover by clicking on any of the “Volume Recovery” or “Format Recovery” option for the best Repairing Disk Failed with Error Could Not Unmount Disksolution.

Step 4: Now, click Start Scan.

Step 5: Wait until the scanning process is overwritten, after a list of the scanned files are displayed.

Step 6: Select the file / folder or volume to be repaired and then select the desired location to save all recovered data and thus fix Repairing Disk Failed with Error Could Not Unmount Disk problem.

Step 7: Progress bar will confirm saving the selected files to the desired destination.

I hope this brief series of commands helped you to repair the partition table of your Mac. If your hardware is not eligible for a direct verification, it will certainly be necessary to change the operating system hard drive and perform a repair from another volume.

In general, if you have any doubts about what to do, it is always better to stop and ask for help from an expert. If we do not know the above procedures, it is best not to continue further, because we can endanger ourselves by damaging the disk or b

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