Intel 311 Series 20 GB SATA 3.0 Gb-s 2.5-Inch Solid-State Drive SSD-like performance with HDD capacity at lower cost than high capacity SSD Accelerates key OS and application data seamlessly using both an SSD and an HDD Caches frequently-used applications and data to improve system performance and responsiveness Intel Solid-State Drive 311 Series, Optimized for Intel Smart Response Technology when used with Intel Z68 Express Chipset + Intel Rapid Storage Technology 10.5 Optimized for Intel Smart Response Technology when used with 2nd Generation Intel Core Processor