Komag ( KOMG) raised its first-quarter revenue guidance Monday, building evidence that last week's earnings warning from Seagate ( STX) didn't indicate sector weakness in the digital storage sector. Komag currently expects first-quarter revenue to come in above the $118.2 million it forecast previously, when it estimated that the top line would resemble that of its 2003 fourth quarter. The company also expects operating earnings in the just-completed first quarter to be similar to the $21 million it posted in 2003's fourth quarter, which is the high end of previous guidance. Analysts surveyed by Thomson First Call are currently forecasting earnings of 44 cents a share on revenue of $117.0 million in the quarter. The news is in sharp contrast to Seagate's warning last week, in which the disk drive maker said worse-than-normal seasonal weakness would lead to first-quarter results that were well below analysts' forecasts. Komag's shares were recently up $1.70, or 9%, to $20.15.