The DSN-5110-10 primary arrays each support 12 internal SAS/SATA1 hard drives and with the addition of up to three expansion arrays for the DSN-5110-10 and up to six expansion arrays for the DSN-5210-10 and DSN-5410-10 can scale to a total of 96TB and 168TB raw storage capacity respectively (and even higher capacity as larger hard drives are introduced).