SEAGATE ST4000NM0023 Constellation ES.3 4TB 7200 RPM 128MB Cache SAS 6.0Gb/s 3.5 Internal Hard Drive (Bare Drive) New - Bare Drive 3-Year Limited Warranty Seagate ST4000NM0023 SEAGATE ST4000NM0023 Constellation ES.3 4TB 7200 RPM 128MB cache SAS 6.0Gb/s 3.5 internal hard drive (Bare Drive)