On the other hand, is that what consumers are most concerned with? In the immortal words of that Home Alone kid: I don't think so. I believe that the average consumer is more concerned with capacity than performance. And with a hybrid drive, you get both.
But while hybrids offer significant performance improvements over traditional hard drives, like hard drives, they have mechanics (moving parts). If you drop your laptop while it's powered up, there's a chance you'll damage the hard drive component of a hybrid drive. That's another factor to think about when deciding what type of drive to get.
Testing the hybrid
During its initial OS installation, the Momentus XT captures boot files and places them in a special segment of the NAND flash where they remain for the life of the drive. The feature ensures that the drive always boots from flash and not from the spinning disk.
Seagates Momentus XT hybrid drive with the back cover removed
The drive also has an "Adaptive Memory" algorithm that monitors which applications and data are initially loaded into a system and then "learns" to place that data on the SSD to speed up performance. Over the course of three boot-ups, system performance becomes optimized to each user's preferences.
In my benchmark tests of the Momentus XT, the initial boot up took 20 seconds, the same as the WD Black hard drive. Then I rebooted -- and the Adaptive Memory firmware kicked in and began optimizing the drive for my system. The second boot took 15 seconds; by the third boot, the drive was down to 12 seconds -- very impressive.
Copying the 327 JPG images took 29 seconds. Opening a 300KB, 372-page Word document took 1 second and then an additional 57 seconds to download all 372 pages.
On the second try, opening the Word document took 1 second again, but all 372 pages loaded in only 15 seconds. By the third try, the cache had really kicked in and it loaded all 372 pages in 10 seconds.
When it came to using the Blackmagic benchmarking software, there was an obvious problem: The software shows only the Momentus XT's hard drive performance, and that doesn't really reflect the drive's true capabilities.
With that in mind: For sequential read/writes, the Momentus XT showed 106MB/sec. and 114MB/sec., respectively. On random read/writes, the drive came back with 99MB/sec. and 90MB/sec., respectively. Those results demonstrate that the SSD was not in use for these functions; these read/write speeds came from the spinning disk in the drive. And, while very respectable for a hard drive, the results come nowhere near SSDs' results, which are anywhere from 200GBs to 250GBs.