According to Gartner

The external controller-based (ECB) disk storage market was profoundly
impacted by the global economic downturn in 2009 and experienced an 8.6
percent year-over-year decline from $18 billion in 2008 to $16.3
billion in 2009, according to Gartner, Inc.'s report, Quarterly Statistics: Disk Array Storage, All Regions, All Countries, 4Q09 Update.
This is the first annual decline for the market since 2002. All regions
experienced a drop in revenue in 2009; the most acutely affected
regions were Japan, Latin America, and Europe, the Middle East and


source Storage Newsletter - Gartner