dating sites south africa afrikaans - Repair disk updating boot support partitions

Enter the following where ‘Macintosh HD’ is the name of the newly created Mac formatted partition, and where ‘x’ is your disk identifier, (remember to use the ‘diskutil list’ command if you need to find out your disk identifiers): 3) Hopefully you can now perform your desired erase, partition, installation or deployment on this drive.

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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.

(Or if you are booting to your own bootable drive with a full system, open Disk Utility from /Applications/Utilities). From the listing, look in the Identifier column for your disk identifier. Enter the following where ‘x’ is your disk identifier.

It will look like ‘diskx’ where ‘x’ is an integer starting at 0. For a single drive system this will probably be ‘disk0’ : 4) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. (Remember to use the ‘diskutil list’ command if you need to find out your disk identifiers): 3) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. OK, we’ve tried to be nice, but is the disk STILL not letting you work with it?

You should also see the name of the disk such as ‘Macintosh HD’. Be sure you backup your files to an external drive or second internal drive, the following procedure will remove everything from the hard drive!

We are now going to force erase the physical disk, creating a single Mac OS Extended (Journaled) volume.

This should then allow you to partition and work with the physical disk again.

1) Using the Terminal application again, booting from OS X Recovery or an external bootable drive.

I have found myself recently experiencing a couple of Macs which would not allow me to repair the directory or permissions in Disk Utility, or erase/partition the drive with an error such as: ‘Disc erase failed couldn’t unmount disc’ or ‘Disk Erase failed with the error: Couldn’t unmount disk.’ Even trying to use Network Deployment tools such as Apple’s Netinstall service or Deploy Studio have also failed to deploy due to these errors.

Normally, any ‘Couldn’t Unmount Disk’ error is attributed to circumstances where the boot drive is being modified or is being used by an application or process.

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.

To create your own bootable disk, refer to our blog ‘Creating a Mavericks bootable install disk’.

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