In the storage world, nothing matches a solid-state drive for speed, and nothing matches a mechanical hard drive for capacity and price per gigabyte. Recognizing these two great tastes would go great together, many vendors have attempted to find the perfect hybrid storage solution, with variable—and often clunky—results. Seagate’s Momentus XT, which we first reviewed in September 2010, offered a 500GB 2.5-inch drive with 4GB of NAND flash with an adaptive algorithm to ensure that the most frequently used files are mirrored in the NAND. This means your boot drive feels faster than a mechanical drive, if only for the stuff you use the most. We liked the first Momentus, but complained that it could use more NAND. Seagate aims to remedy that complaint with this new Momentus. The Momentus XT ups the mechanical portion of the drive to 750GB, while doubling the NAND cache to 8GB. The SATA controller is now 6Gb/s, the industry standard for all new drives. Unlike other hybrid solutions, the onboard controller performs the entire caching computation, so there’s no CPU hit. And there are no weird driver issues or frustrating installation procedures—we’re looking at you, OCZ RevoDrive Hybrid. Seagate’s adaptive memory algorithm simply moves the most-accessed LBAs to the NAND cache.