Home > Data Protection > PowerProtect DD Series Appliances > Dell PowerProtect Data Domain DD9410 and DD9910 > Scale and performance
The base model of Data Domain DD9410 comes with 192 TBu and can expand up to maximum of 768 TBu, whereas the Data Domain DD9910 comes with 576 TBu and can expand up to 1536 TBu.
A deeper rack helps reduce rack space by roughly 25%
PowerProtect DD9910 supports 64 concurrent VM instant restores and supports 118K IOPS for instant access which is 18% faster than for existing models.