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== Understanding GPT Disks ==
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GPT disks differ quite considerably from MBR disks. In terms of capability, GPT supports disks up to 18 Exabytes in size with up 128 partitions. GPT also differs from MBR in terms of layout.
Typically, if the disk management tool detects an uninitialized disk it will automatically display a dialog box providing the option to initialize the disk before proceeding:
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[[Image:windows_server_2008_r2_initialize_disk.jpg|The disk initialization prompt dialog]]
To initialize the disk at this point simply select the desired partition style and click on the OK button to begin the process. Should you decide to initialize the disk at a later time simply dismiss the dialog by selecting the Cancel button. To subsequently initialize the disk right click on the box to the left of the graphical depiction of the disk space (where the disk number, size and status are listed) and select ''Initialize Disk''. In the resulting dialog ensure that the correct disk is selected for initialization and then choose whether to initialize the disk using the MBR or GPT partition styles. Click on OK to initialize the disk. Once completed, the disk will be listed with the chosen partition style with the space marked as Unallocated in the graphical view. In addition, the disk status will have changed from Not Initialized to Online. The next step is to create partitions on the disks or use them as dynamic disks. These topics are covered in subsequent chapters.
== Converting Disks between MBR and GPT Partition Styles ==