Please note that other Pearson websites and online products and services have their own separate privacy policies. This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about Peachpit products and services that can be purchased through this site. If it is already using the GPT scheme, this is not strictly necessary, but you should erase it just to be sure. In order to convert it to the GPT scheme, you will erase the disk. Check the Partition Map Scheme listed at the bottom of the window.ĭepending on what this disk was used for most recently, the partition scheme could be anything.Be sure to select the device entry, not the volume entry indented beneath it.

Select the external disk device entry in the Disk Utility sidebar.If this happens, eject the disk, and use a different disk for the exercise. If you are prompted for a password to unlock the disk, the disk is encrypted, and cannot be used for this exercise.Plug the external disk in to your computer.You can navigate to this folder in the Finder use the Finder shortcut Command-Shift-U or open Launchpad from the Dock, and then select the Other icon in Launchpad. It is located in the Utilities folder, which is inside the Applications folder.

Do not perform this exercise with a disk that contains any files you want to keep. This operation will erase all information on the external disk.

Lion recovery disk assistant