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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.

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(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.

Que debe ser el mismo que en la plantilla de salida.

Well, we had already spent a good deal of time deploying and configuring the Mac Image as well as the Boot Camp image so we didn’t want to “re-install lion” just to regain the Recovery Partition – which in turn allows us to encrypt the drive.Por favor, nótese que el signo ' ' en el paso 8 (esto se denomina desplazamiento de la notación).El texto entre paréntesis es para fines informativos para describir la acción.Reconstruir MBR para que coincida con la nueva información de GPT así restablecer el Híbrido MBR.I decided to go a step further and script those commands so I could save myself some typing and any human errors.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.

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