Updated from May 29Happy with a return to profitability and a decent second-quarter outlook, investors on Friday pushed shares of McData ( MCDTA) up more than 20% on very heavy volume. In recent trading, Class A shares of the storage networking company had gained $2.36, or 21%, to $13.35. Because the company is the product of a spinoff, McData trades under two symbols -- MCDT and MCDTA. On Thursday the company posted a first-quarter profit, reversing the loss in the year-ago period, and reported substantial growth in revenue. The company reported revenue of $103.2 million for the first quarter ended April 30, up 60% from $64.5 million a year earlier. Net income was $5.3 million, or 5 cents a share, compared with a loss of $17.1 million, or 15 cents a share, last year. Excluding items, the company earned $6.7 million, or 6 cents a share.