WD 4 TB 3.5" Performance Hard Drive 128 MB Cache, 3.5" Internal Bare or OEM Drives, Black (WD4004FZWX) Next-generation desktop performance hard drive designed to intensify your PC experience Improved Architectural Designs: Dual Core Processor, High Resolution Controller (HRC), StableTrac Technology Improved Data Protection: Vibration Control Technology (VCT), Corruption Protection Technology (CPT), NoTouch Ramp Load Technology Industry-leading 5-year manufacturer limited warranty Package includes a hard drive only - no screws, cables, manuals included. Please purchase mounting hardware and cables separately if necessary. Ships in WD-certified box for safe transit during shipping.RPM Class-7200.