WD Black 4 TB Desktop Hard Drive: 3.5 Inch, 7200 RPM, SATA III, 64 MB Cache, 5 Year Warranty - WD4001FAEXfeatures : 
- WD Black high performance 3.5-Inch SATA hard drives combine 7200 RPM spin speed, 64 MB cache, and SATA 6 Gb/s interface for the ultimate in power computing.
- High performance electronics architecture features dual processors and bigger, faster caches for maximum read and write speeds.
- StableTrac The motor shaft is secured at both ends to reduce system-induced vibration and stabilize platters for accurate tracking, during read and write operations.
- 4 TB capacity holds up to 800,000 digital photos, 1,000,000 MP3 files, and 300 hours of HD video.
- 5 year limited warranty.
description : WD Black high performance 3.5-Inch SATA hard drives combine 7200 RPM spin speed, 32 MB or 64 MB cache, SATA 3 Gb/s interface, and up to 4 TB capacity for the ultimate in power computing. Backed by a 5-year limited warranty. High Performance Electronics Architecture: Dual processor Twice the processing power to maximize performance. Colossal cache Bigger, faster cache of up to 64 MB means faster performance. Rock Solid Mechanical Architecture: Dual actuator technology A head positioning system with two actuators that improves positional accuracy over the data track(s). The primary actuator provides coarse displacement using conventional electromagnetic actuator principles. The secondary actuator uses piezoelectric motion to fine tune the head positioning to a higher degree of accuracy. StableTrac The motor shaft is secured at both ends to reduce system-induced vibration and stabilize platters for accurate tracking, during read and write operations. NoTouch ramp load tech nology Th
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