Hybrid Hard Drives

What Is A Hybrid Hard Drive?

Hybrid hard drives aim to give you the best of two worlds -- the speed of solid state technology, and the low cost of a standard magnetic hard drive. A bit of software magic helps them work together for improved boot times and faster access to files.

Seagate's Momentus XT hybrid hard drive is one of the first examples to actually hit the market. Basically, Seagate took its Momentus XT 7200 rpm magnetic hard drive and doubled its cache to 32 MB, then added 4 GB of solid-state flash memory. Seagate then wrote some proprietary software for this combo that it calls Adaptive Memory. The company claims the result is a drive that performs like a Solid State Drive (SSD) that would cost more than twice as much. The MSRP is $130 but as of this writing the 500GB Momentus XT hybrid drive is going for under $100 in many online stores.

A hybrid drive stores the user's most active data in its super-fast SSD component, moving data to and from magnetic storage only when absolutely necessary. In fact, a hybrid drive's magnetic platters do not spin most of the time. That eliminates a lot of power consumption, motor heat, and noise. It's rather like a hybrid automobile which runs silently on battery power when cruising around town, with the internal combustion engine burning gasoline only when extra power is needed.

Seagate's Adaptive Memory software "learns" what applications and data are best stored in SSD based upon the user's behavior. So it takes a few cycles of daily work, shut down, and rebooting to see the full potential performance boost of this hybrid hard drive. But, based on reviewers' tests, once the Momentus XT learns your computing style you can expect performance increases of up to 40 percent over 7200 rpm magnetic hard drives.

In real life, that means your computer will reboot or wake up from hibernation 6-8 seconds faster, which is nice but not life-altering. The most noticeable benefit lies in how quickly one can open and switch between applications; sift through image files; and other small but frequently executed tasks. The Momentus XT excels at doing little things much faster than magnetic hard drives. Reading and writing of large multi-gigabyte files, e.g., converting a video file from one format to another, is not that much faster with hybrid drive technology.

A hybrid hard drive seems ideal for mid-priced laptops: low power consumption and heat generation; greatly reduced risk of head crashes because the head is parked most of the time; and decreased noise. But if price is no object, or if you need to move large chunks of data much faster, a more expensive SSD may be the way to go.

The lifespan of a hybrid drive may be less than that of a magnetic hard drive. The electromechanical portion of a hybrid drive wears out more slowly because it moves less frequently. On the other hand, magnetic media can be read and written to many more times than Flash memory can be. It's too soon to tell how long hybrid drives will last in consumer's hands.

Do you have a hybrid hard drive? Post your comment or question below...