More than US$1.5 billion was spent on storage software worldwide in the second quarter, up 7.3 percent from the previous quarter. The top five storage software vendors have remained the same since the last quarter of 2002. In the second quarter, EMC Corp. consolidated its lead as its share of revenue gained about 1.5% in the quarter to 24%, according to IDC. EMC's storage software revenue grew 13.6% from the first quarter, to $399 million from $351 million. Veritas Software Corp. slightly outperformed the market but trailed EMC with 21% of the market, unchanged from the previous quarter. Computer Associates International Inc., IBM Corp. and Hewlett-Packard Co. rounded out the top five vendors.