What you'll find is that most major vendors such as EMC, NetApp, Hitachi Data Systems and even HP have recognized the importance of having some sort of NAS offering in the SMB space. Most now offer lower cost or tiered solutions for these markets.
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Additionally, several startups have come up that offer NAS solutions for the SMB markets with different options around lower cost disks. Additionally, networked storage vendors such as Netgear and Cisco now offer NAS solutions for the SMB space as well.