The DM4100 Family has 7 models, ranging from an entry-level single rack configuration with 3TB of usable storage to a 6-rack configuration with 96TB of usable storage. All models are field upgradeable to any higher model in the family. The DM4100-03 through 48 models are also field-upgradeable to models in the DM4200 family with the same or higher usable storage capacity.