Amazon.com: Western Digital 6TB WD Purple Surveillance Internal Hard Drive HDD - SATA 6 Gb/s, 64 MB Cache, 3.5" - WD60PURZ : Electronics
Seagate SkyHawk 6TB Surveillance Hard Drive - SATA 6Gb/s 64MB Cache 3.5-Inch Internal Drive (ST6000VX0023)
Western Digital WD6003FFBX New Factory Sealed
Seagate ExpansionPLUS 6TB External Hard Drive HDD - USB 3.0, with Rescue Data Recovery Services and Toolkit Backup Software (STKR6000400) - Walmart.com
Western Digital 6TB WD60EFAX-68JH4N1 Hard Drive SATA 6Gb/s NX HA500 | eBay