DescriptionPacked with power to handle the small- to medium-sized business NAS environments and increased workloads for SOHO customers, WD Red Plus is ideal for archiving and sharing, as well as RAID array rebuilding on systems using ZFS and other file systems. Built and tested for up to 8-bay NAS systems, these drives give you the flexibility, versatility, and confidence in storing and sharing your precious home and work files.For small or medium businessesExclusive NASwareWD Red Pro for big business3D active balance plus24/7 environmentFor small or medium businessesStream, backup, share, and organize your digital content with a NAS and WD Red Plus drives designed to effortlessly share content with the devices at your home or business. NASware technology increases your drives’ compatibility with your existing network and devices. For larger businesses with up to 24 bays, count on WD Red Pro drives to deliver exceptional performance.Exclusive NASwareNot just any drive will do. Get a large capacity in your 8-bay NAS system and with Western Digital’s exclusive NASware technology, you can optimize each and every drive. Built into every WD Red hard drive, NASware advanced technology improves storage performance by increasing compatibility, integration, upgradeability, and reliability.WD Red Pro for big businessIf you’re looking for heavy-duty performance for NAS, WD Red Pro NAS hard drives deliver exceptional performance for medium to large business customers with extreme demands. For NAS environments with 9 to 24 bays, WD Red Pro drives deliver uncompromising performance.3D active balance plusThe enhanced dual-plane balance control technology significantly improves the overall drive performance and reliability. Hard drives that are not properly balanced may cause excessive vibration and noise in a multi-drive system, reduce the hard drive life span, and degrade the performance over time.24/7 environmentSince your NAS system is always on, a reliable drive is essential. With an MTBF of up to 1 million hours, the WD Red Plus drive is engineered to tackle 24 x 7 environments.Main SpecificationsProduct DescriptionWD Red Plus WD40EFPX – hard drive – 4 TB – SATA 6Gb/sTypeHard drive – internalCapacity4 TBForm Factor3.5″InterfaceSATA 6Gb/sData Transfer Rate600 MBpsBuffer Size256 MBSpindle Speed5400 rpmFeaturesConventional magnetic recording (CMR), 24×7 continuous operation, NASware technologyDimensions (WxDxH)101.6 mm x 147 mm x 26.1 mmWeight570 gExtended SpecificationsGeneralDevice TypeHard drive – internalCapacity4 TBForm Factor3.5″InterfaceSATA 6Gb/sBuffer Size256 MBFeaturesConventional magnetic recording (CMR), 24×7 continuous operation, NASware technologyWidth101.6 mmDepth147 mmHeight26.1 mmWeight570 gPerformanceDrive Transfer Rate600 MBps (external)Internal Data Rate180 MBpsSpindle Speed5400 rpmReliabilityMTBF1,000,000 hours24×7 OperationYesNon-Recoverable Errors1 per 10^14Load / Unload Cycles600,000Expansion & ConnectivityInterfaces1 x SATA 6 Gb/sCompatible Bay3.5″PowerPower Consumption4.7 watt (read) 4.7 watt (write) 3.1 watt (idle) 0.3 watt (sleep)Environmental ParametersMin Operating Temperature0 °CMax Operating Temperature65 °CMin Storage Temperature-40 °CMax Storage Temperature70 °CSound Emission23 dBA