Seagate Enterprise Capacity 3.5 | ST4000NM0035 | 4TB 7.2K RPM 128MB Cache 3.5" SATA 6Gb/s | 512n | FIPS 140-2 | Enterprise Internal Hard Disk Drive HIGH-DENSITY STORAGE - 4TB hard disk drive designed for Hyperscale applications/cloud data centers solutions requiring maximum storage efficiency. 3.5-inch form factor for space-constrained data centers. ULTIMATE PERFORMANCE - Robust performance with dual processors, ramp load technology, top-cover-attached motor and humidity sensor for optimum performance in all chassis. FAST DATA ACCESS - 6Gb/s SATA for high data integrity, scalability and fast data access. HIGHEST-RELIABILITY - The industrys highest-reliability 7200-RPM drive, designed for 247 operation with MTBF of 2.0M hours and AFR of 0.44%. POWER EFFICIENT - On-demand PowerBalance feature available for lower power/performance inrandom read/write environments.