 Even though there were a number of new entrants, industry participants continued to decline in total to 15 in 1999.Unit volume and industry revenue monotonically increased during the 1990s to 174 million units and $26 billion.The industry production consolidated around the 3.5-inch and 2.5 inch form factors; the larger form factors dying off while several smaller form factors were offered but achieved limited success, e.g.