Fujitsu FibreCAT S80 Manual page 60

Adding spare drives
In the new window which opens, select the drive you want to add and then click
ADD to make this a spare drive (ID 3 / ID 18 / ID 33 / ID 48).
When the drive appears in the right-hand column, select and highlight the drive
and then select the Make Spare Drive(s) button to confirm.
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