 "WD Purple WD10PURX - Surveillance hard drive 1TB" " WD 1TB Internal Desktop Hard Drives CDWG.com
"WD Purple Surveillance Storage offers exclusive AllFrame technology to bring you premium reliability and peace-of-mind when installing your home or small to medium business security system. WD Purple's exclusive firmware upgrades work with ATA streaming to reduce error pixilation and video interruptions that occur when desktop hard drives are incorrectly used as storage in security systems. WD Purple Surveillance Storage is built for 24/7, always-on, high-definition surveillance security systems that use up to eight hard drives and up to 32 cameras.You wouldn't use a bicycle to transport cargo across the country because it's not the right tool for the job. You also shouldn't use a desktop hard drive in your surveillance security system because it wasn't designed for that application. WD Purple surveillance-class storage has been tested to be compatible in a wide-range of security systems. These drives are designed to replace standard desktop drives that were not designed for the harsh 24/7 always-on, high-definition surveillance environment. Desktop drives are built to run for only short intervals and are not engineered to withstand high-temperature fluctuations and equipment vibrations found in a typical surveillance application." 
 "WD Blue WD5000AZLX - hard drive 500 GB SATA 6Gb/s" " WD 6Gb/s Internal Desktop Hard Drives CDW.com
"Built to WD's highest standards of quality and reliability, WD Blue offers the features and entry-level capacities that are ideal for your computing needs. WD Blue is designed by the brand that you trust with the quality you would expect for a tested, proven, everyday storage solution.WD Blue storage is designed and manufactured with technology found in WD's original award-winning desktop and mobile hard drives. WD Blue sets the baseline for everyday storage by consistently delivering improved performance over previous generations while successfully maintaining WD's quality and reliability for over six generations. The difference is that their colors never fade, generation after generation.WD Blue is available in a broad range of entry-level capacities, cache sizes, form factors and interfaces so you can be sure there's a drive that's the perfect fit for your system. However, not all hard drives are created equally and for your applications that demand more, WD gives you the power of choice." 