The Platter Name list box contains each of the configured copies for this Disk Group. When you select a copy, its configuration settings are displayed in the Platter Type section.
Note:
Any changes you make on this dialog box will only affect this copy on the next volume of this Disk Group. It will not change any volumes that have already been created. To make the changes immediate, the Disk Group must be promoted (using Force Promote at the Disk Group Settings dialog box).