Unrivaled Performance Samsung's SSD 840 PRO Series is a high-performance SSD, capable of delivering up to 100,000 IOPS Random Read Speed and 540MB/s Sequential Read Speed-an SSD of unrivaled high performance. Built with an advanced MDX controller, Samsung's SSD delivers high speeds regardless of data type, unlike competing controllers that greatly favor compressible data. Performance Sustainability The Samsung SSD 840 PRO Series provides the same excellent performance throughout its entire lifetime even under extremely heavy workloads. In fact, the sophisticated MDX controller is capable of maintaining peak performances under punishing conditions for more than twice as long the nearest competitor.Storage Capacity: 256 GBMaximum Read Transfer Rate: 540 MB/sMaximum Write Transfer Rate: 520 MB/sDrive Interface: SATADrive Interface Standard: SATA/600Drive Type: InternalForm Factor: 2.5Height: 0.3"Width: 2.8"Depth: 3.9"Weight (Approximate): 1.92 oz"