Free Express Shipping! Synology 20TB HAT5310 SATA III 3.5" Internal Enterprise HDD 20TB Storage Capacity, 3.5" Form Factor, SATA III 6 Gb/s Interface, 512MB Cache, 7200 rpm, Up to 281 MB/s Sustained Transfer Rate, 2.5 Million Hours MTTF, 550TB Yearly...