WD Desktop 3 TB SATA Hard Drives ( WDBH2D0030HNC) Product Specifications Interface SATA 6 Gb/s Performance Specifications Rotational Speed IntelliPower * Buffer Size 64 MB Transfer Rates Buffer To Host (Serial ATA) 6 Gb/s (Max) Physical Specifications Formatted Capacity 3,000,592 MB Capacity 3 TB User Sectors Per Drive 5,860,533,168