Select either Automatic or Manual.
Automatic–The disks to be added will be selected for you, based on the disk size you specify.
Manual–You select the disks to add.
Note: FilerView prevents you from accidentally selecting the last spare. For automatic disk selection, the number of disks displayed is the number of available disks minus one spare. For manual disk selection, you cannot select all the disks at once. To select all the available spares, use the command-line interface.