Updated from 7:58 a.m. EDTEMC's ( EMC) first-quarter earnings roughly tripled from a year ago on a 35% jump in revenue -- its highest top-line growth in three years, the company reported before the opening bell Thursday. But top-line guidance for the second quarter barely exceeded expectations and analysts said the tone of a conference call seemed a bit conservative as the discussion turned to outlook for the rest of the year. For example, when asked if he was "comfortable" with consensus estimates of 34 cents for the year, Bill Teuber, EMC's Executive Vice President and CFO, demurred, saying: "We had a good first quarter, and expect a good second quarter, but people might have different perspectives on what the third and fourth quarters will bring." After making gains in pre-market trading, EMC's stock turned south and recently was off 11 cents, or 0.8%, to $13.09. "The Street was looking for more leverage; there may not be as much upside for the year," said Cliff Su, who follows the company for Lazard, which has done investment banking for EMC. The Hopkinton, Mass., storage giant earned $140 million, or 6 cents a share, on revenue of $1.87 billion in the latest quarter, compared with earnings of $35 million, or 2 cents a share, on revenue of $1.38 billion last year. The latest quarter included a charge of 1 cent a share related to an acquisition. Excluding the charge, analysts surveyed by Thomson First Call were forecasting earnings of 6 cents a share on revenue of $1.83 billion. "This wasn't a huge surprise," analyst Wendy Abramowitz of Argus Research said of EMC's quarterly results. "What we're seeing this week is that if a company doesn't beat expectations the stock doesn't do much." (Argus does not have a banking relationship with EMC.) By segment, EMC said systems revenue totaled $895 million in the latest quarter compared with $752 million a year ago; software revenue totaled $484 million compared with $299 million last year; and services revenue totaled $473 million in its latest quarter compared with $306 million a year ago.