Amazon.com: Western Digital 6TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5
Amazon.com: Western Digital 6TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 64 MB Cache, 3.5,WD60PURZ-85ZUFY1 - Western Digital Purple 6TB 5400RPM SATA 6Gb/s 64MB Cache (RoHS) 3.5-Inch Surveillance Hard Drive,Amazon.com: Western Digital 6TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 256 MB Cache, 3.5,6TB WD Blue SATA 3.5in WD60EZAX