20. Hitachi Data Systems
Headquarters: Tokyo, Japan
Revenue in Most Recent Quarter: $24.0 billion (Q1, FY2009) (all of Hitachi)
Channel Chief: Mike Walkey, senior vice president of global channels
Why It's a Strategic Storage Partner: HDS is a major player in the midrange and enterprise storage markets, both under its own brand name and through OEM and reseller deals with system vendors such as HP and Sun. It is also a major player in storage consolidation with a series of appliances that virtualizes multiple vendors' storage arrays behind a single management console.