#COULD NOT UNMOUNT DISK 69888 HOW TO#
#COULD NOT UNMOUNT DISK 69888 FOR MAC#
#COULD NOT UNMOUNT DISK 69888 INSTALL#
#COULD NOT UNMOUNT DISK 69888 FREE#

The instructions to boot into the Recovery Mode are different for Intel-based and Apple silicon Mac models, but they are the same on any OS, so you can follow these instructions even if you are using the newest macOS Monterey. After that, you can open Disk Utility from macOS Utilities to unmount the drive. This can be achieved by booting your Mac from an external hard drive or macOS Recovery. So you need to start from a different volume to modify the internal drive. The system can’t unmount the disk you are currently booted from.

Wait until the formatting process is done.

Wait until the process is ready in the Task to-do list on the right.

#COULD NOT UNMOUNT DISK 69888 INSTALL#

Install and run the software from the Applications folder.

To format the drive with Stellar Partition Manager: You can also use this software to create a bootable DMG and load the system from it instead of the external drive.

#COULD NOT UNMOUNT DISK 69888 FREE#

Formatting the hard drive or partition scheme will recreate a new HFS file structure on the hard drive, which will be free from cryptic errors. Use Stellar Partition Manager when macOS can not format, erase and repair the Mac hard drive or a volume due to the “couldn’t unmount disk” error. Stellar Partition Manager is an alternative to Disk Utility that allows performing various types of disk manipulations: create, hide, delete, resize and mount a volume. Fixing with Stellar Partition Manager Software

For your convenience, we have structured instructions into step-by-step guides that are easy to follow. This includes using Stellar Partition Manager software, Disk Utility, or Terminal.

There are several different ways to fix the “couldn’t unmount disk” error message on Mac.

#COULD NOT UNMOUNT DISK 69888 HOW TO#

How to Fix “Couldn’t Unmount Disk” Error on Mac

#COULD NOT UNMOUNT DISK 69888 FOR MAC#

Use Stellar Data Recovery Professional for Mac if you encounter any kind of data loss and are in need of a quick and easy data recovery solution. Make sure to use Time Machine or other third-party services to backup your Mac and protect your files. This becomes especially important whenever you try to fix any disk-related problems, including when you can’t unmount the disk on Mac. We all know that it is recommended to do regular Mac backups. Before Fixing the “Couldn’t Unmount Disk” Error Trying to perform any drive modifications would fail to give you the “couldn’t unmount disk” error message. You are also unable to partition, reformat or erase the disk you are currently booted from. The system won’t allow you to do anything if some other application or process uses the drive. Why is Mac Giving You the “Couldn’t Unmount Disk” ErrorĬan’t unmount disk on Mac usually happens when you try to do some manipulations with the external or internal drive.

How to Fix “Couldn’t Unmount Disk” Error on Mac.

Before Fixing the “Couldn’t Unmount Disk” Error.

Why is Mac Giving You the “Couldn’t Unmount Disk” Error.

Unfortunately, you can't specify 100% like you can with many commands. Change that value if you have a 1TB Fusion Drive to 1.024t.

You may have to reduce that number to 3.1279t or something though. This will grow your disk back to fill up your 3TB disk. They will be shown in the output from the first command line. The first UUID is your LV UUID, the second is the PV UUID that you want to grow (incase I mistyped one of them). See explanation below.ĭiskutil cs resizeStack LVUUID PVUUID 3.128t The results from the first command are needed for the second command. Here is a Solution for Repartitioning a Fusion DriveĪnswered by AskDifferent's FROGGARD and edited slightly by Kappy. What to do if your Mac’s Fusion Drive fails (or shows signs of failure) How to fix a split Fusion Drive - Apple Support However, you could reconstitute the Fusion Drive. If you want, you can leave the SSD as-is, and only use the HDD since the SSD is too small for anything useful. This iMac originally had a Fusion Drive consisting of a 1TB HDD and a PCIe flash drive? If I'm correct, then all you can install on the flash drive is macOS.

Could not unmount disk 69888