How to Fix Thumb Drive That Does Not Read on Mac?

Summary: In this blog, we will try resolving the 'could not unmount the deejay' mistake and discuss the best possible manner of solutions for Mac users. Due to unmounting mistake, there could be chances of data loss. And then, we recommend you to accept a Mac data recovery software by your side to get dorsum the lost data. Accept a free trial of Stellar Data Recovery for Mac to see how it can actually help yous in diverse 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 Deejay Utility. They are unable to erase or division the drive. Fifty-fifty the Network deployment tools like Apple's Netinstall service or the DeployStudio fails, on account of this fault. The error, which is thrown, is the:

Disc erase failed couldn't unmount disc.'

or

' Disk Erase failed with the error: Couldn't unmount disk.'

The error occurs in such situations like formatting Mac as well as sectionalisation and verification and repairing of Mac disk.

Causes

The reason for this error is the modification of the kicking drive, or it is being used past some other process or awarding. If the internal drive is causing the result because theOs X Recovery exists equally a partition on the concrete deejay, unable to modify or unmount the internal drive, then the preference must be given to a network drive or an external drive.

Solution

At that place are many solutions when the user faces these problems.

Using an external drive or Bone X Recovery for the starting up of the Mac from some other bootable drive. Disk Utility can be run from the external drive. The version of the OS X does non matter, by at least must be10.7, x.8 and 10.9. The one and only requirement are that Disk Utility must reside on the drive.

There are 3 means of resolution of the problem. These are:

1. Fixing with Stellar Partition Manager Software

If the OS X is denying you to format, erase and repair the Mac hard drive or a volume due to the Couldn't Unmount Disk' Error so apply Stellar Division Managing director to format the hard bulldoze with Mac Bone Ten Extended Journaled file organisation. Formatting the difficult drive or sectionalisation scheme will recreate a new HFS file structure on the difficult drive, which will exist free from cryptic errors. Farther, the Stellar Sectionalisation Director utility volition permit the user to create, resize, add together partitions on the hard bulldoze with HFS, HFS+, Fat or NTFS file systems.

Note: Stellar Partition Manager is uniform with Bone X 10.6 – macOS Sierra 10.12. It doesn't supports APFS.

2. Fixing with USB Kicking Bulldoze

This is the nigh recommended method to repair the mistake. Any OS Ten kick drive is needed to complete the task. Simply, the of import signal to recall is that the installer or the recovery drive must reside in the drive, separate from the primary kicking deejay with the installed OS on it.

The post-obit steps can do the fixing:

• TheUSB kicking drive is fastened to the Mac, and the arrangement is rebooted
• TheOption key is held during the booting and then the attached kicking drive is selected
• Disk Utility is accessed through the Boot carte. Information technology is the Utilities Carte for the Installer Disk
• Verification of the Deejay is done with the "First Help."
• The repair is done
• The original chore which was halted due to the above error was performed again

The above steps offer a resolution of the trouble. The errors could have been unresolvable without a boot drive. Therefore, a bootable pollex bulldoze was a good option. For the olderMac Bone X like x.6 or before, the opportunity lies in aSuperDrive and a bootable DVD, and this can also offer the same resolution.

3. Fixing With Recovery Sectionalisation

The above mistake may likewise be triggered due to first Aid or while formatting a non-boot partition. In this example, a resolution of the problem occurs with the Recovery Division, which comes with all the newer versions of the Mac OS 10. Nevertheless, this is not applicative for the modification of the boot disk with the assistance of partitions or formatting. Then the resolution lies in the previous method. Otherwise, we follow the steps:

• The Mac is rebooted, with theChoice key being held down and the Recovery Partition is chosen
• The Disk Utility is called from theKick Menu
• Verification and repairing the disk is done with the "First Aid."

or

• "Erase" is used for the disk formatting

This will not piece of work with the disk that is throwing the error is the aforementioned as the primary boot partition. The solution lies only in using a divide USB drive for fixing the error.

External USB Drive not Mounting on Mac?

Imagine how will y'all access the, videos, documents similar spreadsheets etc. or thousands of photos if the external drive doesn't mountain on Mac?

Thankfully, advanced software such as Stellar Information Recovery Professional for Mac can help you recover data from an unmounted external hard drive.

Stellar Data Recovery Professional for Mac supports the recovery of files from an external hard drive on macOS Big Sur, Catalina, Mojave and other macOS/Os X variants. Further, it provides support for information recovery on APFS, HFS, HFS+, NTFS, Fatty and ex-Fat external hard drives. Once you have activated the Mac recovery tool you tin recover as many numbers of files from whatever given external drive or SSD.

Watch Tutorial: Recover Data from an Unmounted External Bulldoze

About The Writer

Vishal

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 unlike written past Karen Bluementhal.

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Source: https://www.stellarinfo.com/blog/couldnt-unmount-disk-error-mac/

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