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This is an example of a procedure to erase an external disk containing a single encrypted partition. Open the Disk Utility application and highlight the "Logical Volume Group" representing your external disk. An example is shown below. (Hint: click on image for a better view.) Next, click the Info icon to get the pop up window. Note, in the example shown ...


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I would suggest the Profile Management option that is included in OS X Server. It has all of the described above features and it is really easy to operate with. Take a look at https://www.apple.com/ca/osx/server/ it's $22.99 CAD.


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OS X Yosemite automatically converts hard drives to Core Storage volumes, whose sizes can't be changed. You need to undo the Core Storage conversion. Here are instructions for making that happen. (source - this method worked for me). This method should be non-destructive, but as always, take a backup first! Boot into Recovery HD. If for any reason you ...


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If you have a backup, format the Mac's drive, taking care to protect the backup. If you don't have a backup, try some tools like DiskWarrior or TechTool on the Mac's drive. If those don't help, you'll probably have to format and lose your data. If you can't format the drive, it will need to be replaced.


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The other option would be to boot into recovery mode (COMMAND-R at boot) go into disk utility and (if O/S X is on the HD) delete the Ubuntu partition and expand the Mac partition into that space.


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OmniDiskSweeper may not be running with administrator privileges and it cannot access all folders, therefore it is not counting everything. The command du -x -sk /* in Terminal may give you a better/correct result.


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To remove all entries from the GPT and MBR tables, open the Disk Utility application and do the following. Select your disk. Select Partition tab. Set Partition Layout to "1 Partition". Set Format to "Free Space". Click on the Option... button and select "Master Boot Record". Click Ok to close the pop up window. Click the Apply button. The image below ...


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Click on the "Time Machine" drive that is indented (the one underneath the one you selected on your screen). Then the "Erase" tab should appear. Also, if your Time Machine is encrypted, my experience was that I needed to erase it and choose an unencrypted format in order to really regain full control of the disk.


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You can install Yosemite on an encrypted partition. To use encryption, you also have to use core storage. If you do not use encryption, then the use of core storage is optional. If you encrypt after installing without core storage, then a conversion to core storage will take place. Fusion drives require the use of core storage. Yosemite can only be installed ...



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