WD Red Pro WD221KFGX 22TB 7200 RPM 512MB Cache SATA 6.0Gb/s 3.5″ Internal Hard Drive

3D Active Balance PlusOur 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.Error Recovery PreventionBuilt specifically for RAID and NAS environments, WD Red Pro drives come equipped with error recovery controls as part of NASware 3.0 technology to help reduce drive fallout in RAID applications.Extended Drive TestingA NAS environment that has up to 24 bays is very demanding on a hard drive with added vibration and heat. This is why every WD Red Pro drive is shipped with extended thermal cycle burn-in testing to help ensure each drive is tested for extended reliable operation.Boost Your NASWD Red drives are available in capacities up to 22TB utilizing the OptiNAND technology's capacity-enabling feature.Helps Protect Your DataThe innovative ArmorCache feature (22TB only) offers power loss protection of your data in write-cache enabled (WCE) mode while increasing performance in write-cache disabled mode.