"Seagate is offering the best of both worlds with a new hard
drive, the Momentus XT, that combines the capacity of a
platter-based hard disk with the speed of a solid-state drive
(SSD). Combining the two is a special algorithm that learns the
user's habits and stores the most commonly retrieved data on the
SSD, or moves data off when not used.
"Seagate (NYSE: STX) tried something like this a few years ago
but the drives were not well received due to poor performance.
After a few more years of technological advances, the company said
it's got the kinks worked out.
"Momentus XT is a 2.5-inch drive, a form factor designed for
notebooks, but it will work just fine in a desktop or even a server
with a third-party mounting bracket in a 3.5-inch drive bay."