EMC Third-Quarter Net Jumps  NEW YORK (Reuters) - EMC Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=EMC.N target=/stocks/quickinfo/fullquote"&gt;EMC.N&lt;/A&gt;, the top maker of  corporate data storage equipment, on Tuesday reported quarterly  profit jumped amid market-share gains against rival storage  suppliers.