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EMC Corp. in Hopkinton said it may cut up to 1,000 jobs, mostly in the first part of the year, in a restructuring that will put greater emphasis on the small but faster growing parts of the company, while its traditional storage business slows. David Goulden, head of EMC’s storage division, said the cuts are part of a “rebalancing” as EMC expands more into mobile technology, big data analytics, and data storage over the Internet. Overall, he said, EMC expects to end 2014 with roughly the same number of employees that it had at the start of the year.