Wd Purple 4tb 6tb 3tb Surveillance Hdd 64m Cache Sataiii 6.0gb/s 3.5" Western Digital Internal Hard Drive 1tb -12tb Hd Harddisk - Hard Disk Drive - AliExpress
WD Purple 6TB Surveillance Hard Disk Drive - 5400 RPM Class SATA 6Gb/s 256MB Cache 3.5 Inch WD63PURZ - Newegg.com
WD expands surveillance-class hard drive line with 6TB Purple