WD Red PRO 22TB 3.5" SATA NAS HDD/Hard Drive 7200rpm. Edition WD221KFGX. MPN WD221KFGX. Model WD221KFGX. WD Red Pro drives with NASware technology takes the guesswork out of selecting a drive. Simply put, a WD Red Pro drive is one of the most compatible drives available for NAS enclosures.
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