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What: Shares of hard disk drive maker Western Digital (NYSE: WDC) climbed 10% Friday after resuming production in Thailand ahead of schedule and, in turn, raising its revenue outlook.

So what: Western Digital has been the disk drive maker worst-hit by the Thai floods, but the announcement suggests that it will be able to regain the market share it lost to main rival Seagate Technologies (Nasdaq: STX) much faster than expected. In fact, Seagate shares -- which have been on fire over the past couple of months -- are down 5% on today's news.

Now what: Western Digital now sees current-quarter revenue of at least $1.8 billion, up nicely from its prior view of $1.05 billion to $1.25 billion. "Much work remains to be done, but we couldn't be more pleased with the effort and results thus far," said CEO John Coyne. More important, with Western Digital shares still down about 24% from April highs and sporting a P/E below 8, investors still have room to benefit from further recovery.

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