Seagate 4TB IronWolf NAS SATA Hard Drive 6Gb/s 256MB Cache 3.5-Inch Internal Hard Drive for NAS Servers, Personal Cloud Storage (ST4000VN008), Silver (ST4000VN008) - Newegg.com
Refurbished: WD30EFZX - Western Digital Red Plus NAS 3TB 5400RPM SATA 6Gb/s 128MB Cache 3.5-inch Internal Hard Drive - Newegg.com
ST4000DM004 - Seagate BarraCuda 4TB 5.4K 6G 256MB Internal SATA Hard D – ALL4COMPUTERS LLC
WD Red™ Plus NAS Internal Hard Drive 3.5" HDD | Western Digital
Seagate IronWolf 4TB NAS Hard Drive 5900 RPM 3.5" RAID - Newegg.com
Seagate Ironwolf Pro 16tb Nas Internal Hard Drive Hdd - 3.5 Inch Sata 6 Gb/s 7200 Rpm 256mb Cache For Raid Network Attached Storage, (st16000ne000) : Target