Give you a classic example, while Maxtor, Seagate and the others had 10Gig platters, they were stuck at 6.8Gig for quite a few months. Then they announced 75GXP which had the largest areal density back then, only a couple days later Maxtor announced 20Gig platter drive. And now, the 7200rpm 20Gig class, with Maxtor, Quantum, Seagate, and WD all arrived, some for instance for months already, IBM 60GXP is nowhere to be seen. WD now has 30GB, Maxtor will soon have 30GB or even 40GB, IBM is still stuck at 15/20.