Disk utility stuck on updating boot support partitions Gambar sexx
This can happen during partitioning, disk verification and repair, and even during formatting, and there’s usually little to no additional information provided as to how to resolve the problem or even what the problem is.Typically the “Couldn’t Unmount Disk” error pops up when the currently boot drive is being modified, thus the easiest solution is to boot from another drive and run Disk Utility from there instead.I would strongly recommend at this stage attempting to back up any data that is required before proceeding with the following steps.Some of the following steps are destructive and will lose ALL data on your drive. You can try booting from OS X Recovery (by holding ‘CMD’ ‘R’ keys at startup) or an external drive and use the command line to attempt to unmount or erase the disk: 1) Once booted from OS X Recovery, select Terminal from the Utilities pull down menu. Bit more drastic, but you can attempt to force a volume or the entire physical disk to unmount: FOR A VOLUME: 1) Using the Terminal application again, booting from OS X Recovery or an external bootable drive, Enter the following where ‘x’ is your disk identifier and ‘y’ is your volume identifier, (remember to use the ‘diskutil list’ command if you need to find out your disk and volume identifiers): 3) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. FOR AN ENTIRE PHYSICAL DISK: 1) Using the Terminal application again, booting from OS X Recovery or an external bootable drive.So the first thing to do is to startup the Mac from another bootable drive such as an external drive or OS X Recovery. An external drive or a network drive is preferred if it is the internal hard drive you have an issue with, since the OS X Recovery is a partition on the same physical drive which may not be able to successfully unmount or modify your internal disk.
Russell has been a member of the Amsys team for over 20 years, initially working within the repairs department, he is now a fully certified Apple Master trainer delivering a range of OS X, i OS and Apple Hardware courses.
You will need any 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: I ran into this twice recently, first when attempting to modify partitions on a drive, which came right along with a separate “partition failed” error, and again was triggered when attempting to format those partitions.
The above steps did the trick and everything was working again as expected.
This is a good example of why it’s very valuable to have a bootable USB thumb drive set up with whatever version of OS X is running on your Macs, because without a separate boot drive some of these errors would be unresolvable.
Such boot drives are easy to create on your own, here are instructions for making boot disks for OS X 10.9, OS X 10.8, and OS X 10.7.
In most Mac systems, the boot drive will be using Apple’s Mac OS Extended (HFS ) filesystem format, which is a collection of fast-access “B-tree” databases that store where a file is located on your drive, its logical hierarchical organization, and attributes such as file ownership and access permissions.