WD Blue 3D NAND SATA SSD WDS100T2B0A – Solid state drive – 1 TB – internal – 2.5″ – SATA 6Gb/s

HP – Hard drive – 2 TB – internal – 3.5″ – SATA 6Gb/s – 7200 rpm – buffer: 64 MB – for Workstation z210, Z220, Z230, Z4 G4, Z420, Z6 G4, Z620, Z640, Z8 G4, Z820