SAN FRANCISCO -- Seagate ( STX) edged Wall Street's second-quarter earnings estimate as profit nearly tripled, but the storage giant's third-quarter revenue outlook took shares lower after hours. The company said Thursday that net income for the quarter ended Dec. 28 rose to $403 million, or 73 cents a share, from $140 million, or 23 cents a share, a year earlier. Excluding charges, Seagate earned 76 cents a share, edging analysts' estimate of 75 cents a share, as polled by Thomson Financial. Revenue rose to $3.42 billion from $3 billion a year earlier. Analysts had expected $3.49 billion. For its third quarter, Seagate said it expects to earn 62 cents to 66 cents a share before items on revenue of $3.2 billion to $3.3 billion. Analysts had expected earnings of 62 cents a share on revenue of $3.31 billion. Shares of Seagate were off 60 cents, or 2.8%, to $21 in extended trading.