15 of 20
15. Western Digital
Western Digital
Fortune 500 rank: 319

The hard-drive maker's profits rose 53.7% to $867 million on sales of $8 billion as it diversified beyond the desktop computer market into hard drives for mobile devices, DVRs and other consumer electronic products.

NEXT: Rockwell Automation
Last updated April 29 2009: 1:31 PM ET
Top 50 Exxon Mobil pushes Wal-Mart aside to retake the No. 1 slot this year. Which other companies made the top 50 this year? More
They're hiring! As many big companies are announcing mass layoffs, these Fortune 100 employers have at least 150 openings each. More
The biggest losers Companies from AIG to United Airlines, from ConocoPhillips to Motorola lost billions of dollars last year. Who lost the most? More