Apple Computer <A HREF="http://www.eweek.com/article2/0,1895,1876247,00.asp?kc=ewnws102405dtx1k0000599">faced a lawsuit</A> that alleged the company knew its nano portable music player was defective but still decided to press on with the product's release last month. The credit card-sized nano, which replaced the best-selling iPod mini and is smaller than the traditional iPod, met with rave reviews. But users quickly started grumbling on Internet message boards that the device's screen scratches too easily.