Refurbished Western Digital WD40PURX WD Purple 4TB 3.5" SATA III Surveillance Hard Drive - Walmart.com
Western Digital WD Purple Surveillance HDD 1TB 2TB 3TB 4TB 6TB 8TB SATA 6.0Gb/s 3.5" Hard Drive for CCTV Camera AHD DVR IP NVR|Internal Hard Drives| - AliExpress