When it comes to hard-disk drives, Western Digital (WDC) is the largest publicly traded operator in the U.S. And with its recent deal, it will get much larger. That is, the company has agreed to pay $4.3 billion for the data storage business of Hitachi.

Based on the stock move for Western Digital, investors love the transaction. In early Monday trading, the shares were up a sizzling 17.33% to $35.21.

Analyst Upgrades

• Medicis (MRX) to overweight from neutral at Piper Jaffray, to outperform from market perform at Bernstein, to outperform from sector perform at RBC Capital and to overweight from neutral at JPMorgan.
• Wellpoint (WLP) to buy from neutral at Davenport.
• Humana (HUM) to buy from hold at Jefferies.
• Frontier Oil (FTO) to equal weight from underweight and Resources Connection (RECN) to overweight from equal weight at Barclays.

Analyst upgrades:

• Verizon (VZ) to conviction buy from buy at Goldman.
• CSX (CSX) to outperform from market perform at Wells Fargo.
• AK Steel (AKS) to overweight from neutral, as well as Lorillard (LO) and Fifth Third Bancorp (FITB) to neutral from underweight, at JPMorgan.
• Marathon Oil (MRO) to overweight from equal weight at Morgan Stanley.
• Corning (GLW) to buy from outperform at CLSA.
• Quest Diagnostics (DGX) to buy from hold at Jefferies and to outperform from sector perform at RBC Capital.
• Salesforce.com (CRM) to buy from neutral at Roth Capital.
• Baker Hughes (BHI) to buy from hold at Weeden and to outperform from neutral at Macquarie.
• Western Digital (WDC) and Seagate (STX) to buy from underperform at BofA/Merrill.

Analyst Upgrades

• Tyco Electronics (TEL) and Weight Watchers (WTW) to buy from neutral, and Smithfield Foods (SFD) to buy from underperform, at BofA/Merrill.
• Red Hat (RHT) to overweight from equal weight at Morgan Stanley.
• Gold Fields (GFI) to overweight from neutral at HSBC.
• Novartis (NVS) to outperform from neutral and GlaxoSmithKline (GSK) to neutral from underperform at Credit Suisse.
• Dollar General (DG) to buy from hold at ThinkEquity.
• Eagle Rock Energy (EROC) to outperform from sector perform at RBC Capital.

Analyst Upgrades

• Amazon.com (AMZN) was upgraded to buy from neutral at BofA/Merrill.
• Netflix (NFLX) was upgraded to outperform from perform at Oppenheimer and to neutral from sell at Janney Montgomery.
• Janney Montgomery also upgraded BJ's Wholesale (BJ) to buy from neutral.
• RW Baird upgraded Kforce.com (KFRC), SFN Group (SFN) and Young Innovations (YDNT) to outperform from neutral.
• NetSuite (N) was upgraded to neutral from underweight and Select Comfort (SCSS) was upgraded to overweight from neutral at Piper Jaffray.
• Flushing Financial (FFIC) was upgraded to outperform from market perform at Keefe Bruyette.
• National Instruments (NATI) was upgraded to buy from hold at Stifel Nicolaus.
• RBC Capital upgraded MDS Inc. (MDZ) to outperform from sector perform.

Analyst Upgrades

• Deutsche Bank upgraded Ford (F) to buy from hold and raised its price target to $19.50 from $14.50, citing positive demand trends, sustainable market share gains and strong cash flow.
• BMO Capital upgraded MGM Resorts (MGM) to outperform from market perform with an $18 target, citing stabilizing metrics in Las Vegas.
• Deutsche Bank upgraded TRW Automotive (TRW) to buy from hold, citing better-than-expected production trends, and raised its price target for shares to $52 from $39.
• Dr. Reddy's Labs (RDY) was upgraded to buy from underperform at BofA/Merrill.
• Pulte Group (PHM) was upgraded to neutral from sell at UBS and $8.50 price target.
• Vodafone (VOD) was upgraded to buy from neutral at Nomura.

Seagate Technology (STX) and Western Digital (WDC) have been battling it out in the hard drive sector for decades. While larger conglomerates have sold or dumped their hard drive operations, these two companies control the vast majority of shipped digital storage devices globally. Unfortunately for them, the struggles of the PC industry last year may mean a tough road ahead as PC makers strike back to try and reclaim margins that are still quite thin, even as the U.S. economy rebounds.

Here are some highlights from this past week's earnings coverage on BloggingStocks:

• American Express Co. (AXP) doubled its bottom line in Q4 while its provisions for losses fell.
• Blockbuster Inc. (BBI) warned of weakness in Q4 and lowered its guidance, sending shares lower.
• Coach Inc. (COH) better-than-expected Q2 earnings were accompanied by sales growth, but shares fell.
• Comerica Inc. (CMA) posted a smaller-than-expected Q4 loss, sending shares to a 52-week high.
• CSX Corp. (CSX) posted Q4 earnings that topped estimates but its revenue fell short of expectations.

Louisiana Pacific (NYSE: LPX) closed at $6.11. LPX September option implied volatility is at 78, November is at 77; below its 26-week average of 106 according to Track Data, suggesting decreasing price movement.

Seagate (NYSE: STX) closed at $12.30. STX September 10 puts were active on August 20 with volume of 4,564 contracts. STX September option implied volatility is at 49, December is at 51; below its 26-week average of 68, according to Track Data, suggesting decreasing price movement.

Option Update is provided by Stock Specialist Paul Foster of theflyonthewall.com.

General Motors (NYSE: GM) closed at $2.50. GM is required to submit a recovery plan to the government today as a part of an agreement to receive billions of dollars of federal assistance. GM Feb 3 straddle is priced at 69 cents, GM Feb 2.5 straddle is at $1.18 according to Track Data, suggesting larger price movement.

Seagate (NYSE: STX) closed at $4.37. STX's Chairman of the Board Stephen Luczo purchased 500,000 shares of STX on February 12, 2009. STX March option implied volatility of 120 is above its 26-week average of 89, according to Track Data, suggesting larger price movement.

Palm (NASDAQ: PALM) closed at $8.70. GSMA Mobile World Congress is being held in Barcelona today. PALM March option implied volatility of 122 is above its 26-week average of 107, according to Track Data, suggesting larger price movement.

Option Update is provided by Stock Specialist Paul Foster of theflyonthewall.com.

Here are some highlights from this past week's earnings coverage from BloggingStocks:

• Air Products and Chemicals Inc. (NYSE: APD) met Q1 profit estimates and lowered its guidance.
• Apple Inc. (NASDAQ: AAPL) stellar Q1 results easily topped analysts' expectations, sending shares higher.
• Coach Inc. (NYSE: COH) unimpressive Q2 results due to holiday sales were in line with expectations.
• General Electric Co. (NYSE: GE) Q4 profits were dragged down finance, consumer divisions.
• Harley-Davidson Inc. (NYSE: HOG) Q4 earnings tumbled on lower demand globally and domestically.
• Johnson & Johnson (NYSE: JNJ) reported better-than-expected Q4 earnings but lower revenue.
• Microsoft Corp. (NASDAQ: MSFT) released its dismal Q2 results early and announced job cuts.
• Potash Corp. of Saskatchewan Inc. (NYSE: POT) Q4 earnings more than doubled on higher prices.
• Seagate Technology (NYSE: STX) fell after posting losses and guidance for more weakness ahead.
• Sony Corp. (NYSE: SNE) warned that it would post its biggest loss ever in full-year 2008.
• State Street Corp. (NYSE: STT) earnings tumbled on charges but still topped analysts' estimates.
• UnitedHealth Group Inc. (NYSE: UNH) Q4 earnings were in line with estimates and it reaffirmed its outlook.
• United Technologies Corp. (NYSE: UTX) modest Q4 earnings growth was in line with expectations.

For more highlights from this week, see eBay, Google, IBM, Southwest, UAL, AMR, Northern Trust and others