Now perform the original task that threw the “Couldn’t Unmount” error.Go to “First Aid” and verify the disk, then repair if needed.At the boot menu, choose “Disk Utility” (if using an Installer disk, pull down the “Utilities” menu to access Disk Utility).Hold down the OPTION key during boot, then select the attached boot drive (typically has an orange icon at the boot menu).Attach the USB boot drive to the Mac and reboot.You will need any Mac OS X boot drive to complete this task, I used a Mavericks boot installer drive for this purpose but others should work too, whether they are installation drives or just recovery drives, the important thing is they are bootable and separate from the primary boot disk that stores the installed OS: This is the recommended method because it should always fix the error. How to Resolve the Unmount Error with a USB Boot Drive We’ll also show you a way to forcibly unmount a disk by command line, though that approach must be used with caution as it can lead to data loss on the drive in question. We’ll cover both with a bit of explanation. This will allow you to fix the problem, regardless of the cause, by one of two means, the first is a sure-thing to fix the issue, while the other only works sometimes. For the boot drive, it shouldn’t matter which version of Mac OS X it’s for (assuming 10.7, 10.8, 10.9, 10.10, 10.12, 10.13, 10.14, etc at least), the only requirement is that it has Disk Utility – which they all do. For the former situation where the boot drive is being modified, the easiest solution is to boot from another drive and run Disk Utility from there instead. Memory: 16 GB (8GBx2) G.Typically the “Couldn’t Unmount Disk” error pops up when the currently boot drive is being modified, or if a disk was trying to be erased you may find the erase failed with a couldn’t unmount disk error. Other Info: Logitech Z625 speaker system, Internet Speed: 1 Gbps Download and 35 Mbps UploadĪntivirus: Windows Defender and Malwarebytes Premium Monitor(s) Displays: 2 x Samsung Odyssey G75 27" Sound Card: Integrated Digital Audio (S/PDIF) Graphics Card: ASUS ROG-STRIX-GTX1080TI-O11G-GAMING Memory: 16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz Motherboard: ASUS ROG Maximus XI Formula Z390 OS: 64-bit Windows 11 Pro for Workstations System Manufacturer/Model Number: Custom self built You must be signed in as an administrator to unmount and mount a drive. This tutorial will show you how to manually mount and unmount a drive or volume in Windows 7, Windows 8, and Windows 10. This will allow Windows to automatically mount the drive with its last used drive letter each time the drive is connected to the computer. When you manually mount an unmounted drive, you make the volume mountable again by creating a volume mount point with an assigned drive letter. This can be handy if you no longer want a disk or drive (volume or partition) to be assigned a drive letter when connected until you want to manually mount it. This means the specific drive (volume or partition) will have its drive letter removed and no longer be automatically mounted and assigned a drive letter whenever connected to the computer until you manually mount it again. If you unmount a drive, Windows removes the volume mount point from the specified directory, dismounts the volume, and makes the volume not mountable. Whenever you reconnect a drive to the computer, it will always use the same drive letter it was last assigned or changed to. On systems with a lot of storage you will often run out of drive letters for your partitions and volumes. This ensures Windows can always uniquely identify a volume, even though its drive letter has changed. When you add or connect a new volume (disk or drive), Windows will automatically mount it with an assigned drive letter by default.Įach drive (volume or partition) will have an unique Volume GUID assigned to it by Windows. How to Mount and Unmount a Drive or Volume in Windows
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