WD 4TB 7200 RPM SATA 6 Gb/s 64MB Cache, 3.5-Inch Desktop Hard Disk Drive (WD4003FZEX) : Electronics
Seagate BarraCuda 4TB 2.5" Internal Laptop Hard Drive ST4000LM024
Amazon.com: Western Digital RE 4TB 7200RPM 64MB Cache SATA 6.0Gb/s 3.5" Enterprise Internal Hard Drive (WD4000FYYZ) OEM - 3 Years Warranty (Renewed) : Electronics
WD Gold 4TB Enterprise Class Hard Disk Drive - 7200 RPM Class SATA 6 Gb/s 128MB Cache 3.5 Inch - WD4002FYYZ (Renewed) : Electronics
HP 4TB 7200 rpm SATA Internal HDD K4T76AT B&H Photo Video
2.5 in Form Factor Internal 4 TB Storage Capacity 7200 RPM Rotation Speed Hard Disk Drives for sale | eBay
MaxDigital 4TB 7200RPM 64MB Cache SATA III 6.0Gb/s (Enterprise Storage) 3.5" Internal Hard Drive
Seagate Constellation ES ST4000NM0033 4TB 7200RPM 128MB Cache SATA 6.0Gb/s 3.5inch Internal Enterprise Hard Drive OEM - w/3 Year Warranty (Renewed) : Electronics
Seagate Internal HDD 2.5" 4 TB SATA 5400 rpm
Seagate Enterprise Capacity 3.5'' HDD 4TB 7200 RPM 512e SAS 12Gb/s 128MB Cache Internal Hard Drive ST4000NM0125 - Newegg.com
4XB0G45719-US-04 | Servers4Less.com
HP K2Q82A 4TB 7200 RPM SAS 12Gb/s 3.5" 512e Midline Hard Drive Bare Drive - Newegg.com
Seagate Expansion Black 4TB USB 3.2 2.5" 7200 RPM Portable HDD (STKM4000400) - Bleepbox