![]() ![]() ![]() In Mac OSX, Unix and Linux everything is a file, so you can use this command to monitor opened processes, files, devices…etc. You may see Fseventsd process and it’s process id in the list, use “sudo kill -9” to kill this process.Īdditional Information: List Open Files (lsof) is a useful tool that will show you opened files. Couldnt unmount disk: (-69888) error on Mac pops up when the current boot drive is being modified. I show in this video the solution to the disk disassembly problem in macOS.Solution Disk Erase Failed with error Couldnt unmount disk mac error 69888PTBR. “lsof | grep” then drag the drive to the terminal window to complete the path to the drive’s mount point, and press enter. It can strikefour spots on the spectrum from the speed of the disk erasing to. To terminate the Fseventsd process, login to Terminal and type in: Events are logged in the hidden “.fseventsd” directory at the root of the drive. ![]() It is to log the changes in the file system. You may want to login to Terminal mode and check if there is any process locks down the drive for example: fseventsd process.įseventsd is a file system “events” notifier, running as a daemon process, used by Spotlight, Time Machine and other 3rd party softwares. There is a chance that some background process may lock the drive and prevent it from being formatted, please turn off Spot Light and Time Machine.įor more information about Spot Light and Time Machine, please visit:ģ. diskutil eraseDisk free Empty /dev/diskX. As the name implies, this does a simple erase of the disk and marks the free space as 'empty' with no file system or partition scheme. If your drive has been used under Windows, it might be in Windows NTFS / FAT format, you will need to change the partition format to GUID partition or Apple Partition Map in order to format and mount the drive in disk utility.įor more information about partition in Mac OS disk utility, please check: How do I partition my drive in Mac OS X®?Ģ. There are a few steps you can take, but all are destructive to the data on the device. You can use an installation drive or a recovery drive, as long as it is bootable and it is separate from the primary boot disk where your macOS is installed. Please do the trouble shooting as following:ġ. If Couldn’t Unmount Disk error occurs when you are trying to modify the boot drive, the easiest solution is to boot your Mac using another drive, and then run Disk Utility from that disk. ![]()
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