From the many different specifications of drives, you can now select from the different types that you need to build up the extensive array of capacities, speed and form factors. SAS hard drives offer the enterprise-class of performance at affordable price. SATA hard drives provide the lowest cost solution for enterprise level servers. Not forgetting the SED hard drives which stands for Self-Encrypting Drives help to protect data against loss or theft securely. Speed ranging from 7.2Krpm – 15Krpm, capacity ranging from 72GB – 3.0TB and comes in 2 form factors namely the 2.5”(Small Form Factor) and the 3.5”(Large Form Factor).