We have an AX150SCi which we purchased with 3 x 500GB about two years ago.  I just purchased another 3 x 500GB drives from Dell.  I put the new disks in slots 3, 4, and 5.

I cannot seem to make Disk 3 a hot spare or add it to the existing disk pool.  When I go to either of these options in Navisphere Express, Disk 3 shows either "N/A" or "N/A for HS" and there is no check box/radio box for that drive.  The other two drives show "available" and have a check box.

Any thoughts or suggestions on how I should proceed?