Product description Specifically designed for use in NAS systems with up to 8 bays Tested for 24x7 reliability NASware firmware for compatibility Small and home office NAS systems in a 24x7 environment 5400 RPM ALWAYS ATTACHED. NEVER OUTMATCHED. The WD Red drive is built for single-bay to 8-bay NAS systems and packs the capacity to store your precious data in one powerhouse unit. Cooler Temperatures By reducing power consumption, the operating temperature of your NAS stays cool. With a lower temperature in your system, you can create a more reliable solution for your NAS. Built for NAS Compatibility WD Red drives with NASware technology are purpose-built to balance performance and reliability in NAS and RAID environments. Desktop Drive vs. WD Red Drive A d model : Western Digital 2TB Red NAS Internal Sata 3.5" 64MB Cache Hard Drive tag : Internal Hard Drives