Now that CU-Boulder students have discovered the Hard Drive Cafe in the Kittredge Commons complex for weeknight study breaks, Web surfing, socializing and espresso, its staff is trying to draw bigger crowds on the weekend. The six-month-old coffee and computer hangout has received high marks since it opened on Halloween last year. Students are taking advantage of the cafe's pool table, 19 televisions, a wide assortment of coffees, juices, pastries and appetizers, and eight Imac computers for surfing the World Wide Web.