WD Black 4TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch (WD4001FAEX) | EE Store
Refurbished - WD Black 4TB 2.5" Internal SATA HDD/Hard Drive - RECERTIFIED LN82967 - WD4003FZEX | SCAN UK
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
MB4000GDMTH - HP 4TB 7200RPM SATA 6GB/s 3.5-inch Hard Drive
Seagate Barracuda 4TB HDD 2.5" 5400RPM SATA 128MB Cache Hard Drive - OEM (ST4000LM024) | OcUK
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
Amazon.com: Seagate Enterprise Capacity ST4000NM0025 4TB 7200RPM SAS 6.0 GB/S 128MB 512N Enterprise Hard Drive (Renewed) : Electronics