Stefan Mileschin

SanDisk has built itself a decent reputation in the SSD game, and a cheap cache-only drive is a logical addition to its line. Unlike regular SSD or hybrid upgrades, you don't have to transfer your system to the new drive -- the 2.5-inch, 32GB add-on simply hooks up to a spare SATA III port alongside your spinning storage and then you run SanDisk's ExpressCache software to do the rest. The program, which is currently Windows 7-only, monitors which files you access most frequently and then automatically caches them on the SSD, promising up to 12x faster application launches and also faster boot times compared to your HDD working on its lonesome. Importantly, the ReadyCache works with multiple hard drives too, rather than just boosting your primary drive -- a feature that SanDisk claims gives it a one-up over most other caching solutions. The list price is $100 but Amazon has it up right now for $55.

http://www.engadget.com/2012/09/05/sandisk-readycache/