Sysopt posted a review on the Momentus 5400.3
The first 2.5-inch perpendicular drive to reach us is Seagate's Momentus 5400.3, offering up to 160GB capacity via two 80GB platters. We'll be examining the trade-off in speed for capacity, and deciding whether, given the price premium on new technology, the drive can live up to the performance, quality, and value expected for its presumably high-end mobile market.Seagate Enters Perpendicular Recording: Momentus 5400.3 Review