Synology HAT5310-8TB Enterprise 256MB 7200RPM SATA HDD8TB Storage Capacity3.5" Form FactorSATA III 6 Gb/s Interface256MB Cache7200 rpmUp to 230 MB/s Sustained Transfer Rate2.5 Million Hours MTTF550TB ..

Western Digital 4TB WD Red Plus NAS Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, CMR, 256 MB Cache, 3.5" -WD40EFPXHard disk interface Serial ATA-600Connectivity technology SATABrand Western Digita..