Seagate has launched three new families of notebook hard drive under the Momentus monicker. The most radical drive is the hybrid Momentus 5400 PSD (Power-Saving Drive) which adds 256MB of Flash memory to a 5,400rpm SATA300 2.5 inch hard drive.

The Momentus also has 8MB of conventional cache memory. The highest capacity model of PSD will achieve 160GB of storage with two platters and four read/write heads.