Seagate 2TB Enterprise Capacity HDD SATA 6Gb/s 128MB Cache 3.5-Inch Internal Bare Drive (ST2000NM0033)

Seagate 4TB Enterprise Capacity HDD 7200RPM SATA 6Gbps 128 MB Cache Internal Bare Drive (ST4000NM0033)

Seagate ST6000NM0024 6TB 7200 RPM 128MB Cache SATA 6.0Gb/s 3.5" Enterprise Hard Drive Bare Drive