Apple MAC PRO (Hard Drive Replacement) - Manual (Page 5)

Mac Pro Hard Drive
Formatting the Drive
After installing a new drive, you must format it by the following steps:
Open Disk Utility and select the drive in the list to the left.
Note: If you are formatting the primary drive, use the Disk Utility program on the Install Disk.
Click on the Partition tab.
Click on “Options” and verify GUID is selected if this is a bootable drive.
Apply the change by clicking on the “Partition” button.
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