![]() A background process called QuickLookSatellite, which manages some aspects of generating previews for QuickLook in the Finder and elsewhere, had stalled. The Macworld reader who reported this problem and that the solution worked for some drives had to use an additional bit of troubleshooting to fix another. The disk number appears in a couple of places in the utility’s output. Reconnect the drive and power it up if necessary. Power down the drive if it has a power switch. As far as I know, I didn't see that disk2 in my disk list before. In Disk Utility, I found another disk called disk2 and Mac OS X Base System. But, when trying to partition, Disk Utility said that it cannot unmount the disk. (replace diskX with the number of the disk, like disk3). So I tried to use Disk Utility to erase the startup disk and make a new partition. You may see multiple entries that start the same (as in the figure), such as disk3, disk3s1, and so forth. In the resulting list, find the disk number associated with the unmounted volume. Plug the drive in and power it up if necessary. Regardless, the solution is simple: leave the drive connected to a Mac for however long it needs to repair itself.First, you need to find out what macOS’s internal representation of the disk is: You can also plug the drive into a Windows machine and run Microsoft's disk repair utility, which will allow the drive to work properly when it's reinserted into a Mac but will usually cause some files to be permanently deleted. In both cases, the problem can be fixed by simply leaving the drive connected to a Mac for somewhere between 10 minutes and three hours. The terminal and Finder may give different results as to which files are visible. The drive will mount and appear in Finder, but some or all files will not be visible in Finder and/or in the terminal.If you run first aid, Disk Utility will display a quite-scary message saying that the drive is broken beyond repair. bin 6 Mount-unassigned-device-unraid Apple Final Cut Pro X 1013 Mac Os X. less than 1 year old 0G02529 I use this for time machine backups on my Mac Pro. ![]() Now perform the original task that threw the Couldn’t Unmount error. Disk Utility can see it, but will refuse to remount it. In Windows, mounting and unmounting a volume is accomplished by changing. How to fix couldnt unmount disk error Plug in a disk with a bootable. Hold down the OPTION key during boot, then select the attached boot drive (typically has an orange icon at the boot menu) At the boot menu, choose Disk Utility (if using an Installer disk, pull down the Utilities menu to access Disk Utility) Go to First Aid and verify the disk, then repair if needed.
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