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#MAC OS EXTENDED JOURNALED ENCRYPTED PASSWORD#
You can then start using it or repartition or encrypt it in Disk Utility as needed.Full-disk encryption (FDE) is a low-effort way to ensure that if someone were to get ahold of one of your drives while unmounted or a Mac while powered down, the contents on the drive would be unusable to them without knowing a password or other encryption information. When complete, the disk will be partitioned with one volume mounted, called "Untitled".
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Make sure you've copied the correct Logical Volume Group UUID for the disk you want to erase, especially if you have more than one encrypted disk connected.Įnter the following command to erase the encrypted disk, replacing copiedUUID with the UUID you copied: diskutil cs delete copiedUUID Warning The next command will erase the disk specified by the UUID you enter. In this example this is the UUID for the disk named "Le Disque": 109FC023-5F18-438A-AF3D-14FF60334A0C If you have more than one encrypted disk, locate the Logical Volume Group with the name of the disk you want to erase.Ĭopy the UUID which follows the words "Logical Volume Group". You should see output describing the encrypted disk, starting with info about the Logical Volume Group: CoreStorage logical volume groups (1 found) With the encrypted disk connected, launch Terminal and enter the following command If this doesn't work, let us know which step is not working and how. If you don't see the "Partition" tab, and all the buttons under the "Erase" tab are grayed out, double-check that you've selected the disk on the left side, and not the disk's volume.Ĭhoose a format and enter a name, then click "Erase".
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Select the disk on the left side, not the volume.Ĭlick the "Erase" tab, found between the "First Aid" and "Partition" tabs. The volume will be indented and grayed out. You should see your encrypted volume directly under the disk. Its name will likely start with its capacity and include "Seagate" or "Free Agent" in the name. Open Disk Utility and locate your external disk on the left side. You don't need to mount the encrypted volume to erase the disk. When prompted to "Enter the password for the disk 'your disk'," click "Cancel". However, you can erase the encrypted volume with the diskutil cs delete command (see Terminal section below) in both versions. In Lion, you can use Disk Utility to erase an encrypted volume, but not in Mountain Lion. It's unclear whether you're being asked for the password only when connecting the disk, or when you attempt to erase it. The encrypted volume's password is not required for erasing the disk, only to mount the encrypted volume on the disk.