HGST 4TB 7.2K 128MB SATA III 3.5" HDN726040ALE614 | eBay
Seagate (ST9320423AS) 320 GB HDD 2.5" 16 MB 7200 RPM SATA Laptop Hard Disk Drive 715663213970 | eBay
Seagate BarraCuda 4 TB 2.5 Inch Internal Hard Drive (15 mm Form Factor, 128 MB Cache SATA 6 GB/s Up to 140 MB/s) : Amazon.co.uk: Computers & Accessories
3TB 4TB 6TB 8TB 10TB 3.5" Internal SATA Hard Drive HDD CCTV PC DVR | eBay
MB4000GDMTH - HP 4TB 7200RPM SATA 6GB/s 3.5-inch Hard Drive
500GB, 1TB, 2TB, 4TB Hard Drive 2.5"/3.5" HDD SATA CCTV Desktop Laptop PC Mac | eBay
Seagate IronWolf Pro, 4 TB, NAS Internal Hard Drive, CMR 3.5 Inch, SATA 6 Gb/s 7,200 RPM, 256 MB Cache, for RAID Network Attached Storage, 3 years Rescue Services, FFP (ST4000NE001) :
320GB 1tb 2tb 4tb Internal Hard Drive Laptop PC 2.5' HDD SATA2 SATA3 8MB / 32MB 5400rpm-7200rpm 500GB 750GB HDD - China HDD and Hard Disk price | Made-in-China.com