Not a normal HDD, not yet an SSD killer.
Seagate has just announced their latest addition to 2.5inch HDD. The hybrid Momentus XT HDD is the world fastest in 2.5inch, and cost only a fraction over USD100.
This new beast is a hybrid, as it incorporates traditional mechanical hard disks with 4GB of SSD and 32MB of DDR3 all fused together. The results are astonishing. It is 80 percent faster than conventional 7,200rpm HDD; and 100 percent faster than 5,400rpm HDD. The Momentus XT literally surpass traditional HDD in all tests run by Overclockers Club.