Seagate 28TB 3.5' IronWolf Pro, Hellium, SATA 6Gb/s, CMR, 550WRL, 512MB Cache, 512E, HDD. 5 Years Warranty SPECIFICATION Interface SATA 6Gb/s Drive Bays Supported Unlimited Recording Technology CMR Drive Design (Air or Helium) Helium Workload Rate Limit (WRL) 550 Rotational Vibration (RV) Sensors Yes Cache (MB) 512MB Mean Time Between Failures (MTBF, hours) 2500000hr Nonrecoverable Read Errors per Bits Read, Max 1 per 10E15 Power-On Hours (per year) 8760 Sector Size (Bytes per Logical Sector) 512E Rescue Data Recovery Services(years) 3 3 Limited Warranty (years) 5