This 4TB drive also features a rotational speed of 5, 400 rpm, a 64MB cache to help ensure uninterrupted data transfers, & a sustained data transfer rate of up to 150 MB/s. in addition, the drive is built with features to help ensure it will have a strong operational life, with 300, 000 load/unload cycles, 1 in 1014 non-recoverable read errors per bits read, & No Touch Ramp Load technology. No Touch Ramp Load technology helps ensure that the recording head never touches the disk media. The result is less wear to the recording head & media, as well as enhanced drive protection while in transit. The 4TB Blue 3.5" Hard Drive is lightweight & energy efficient, consuming an average of 5.3W during read/write operations. It provides users with free access to WD Acronis True Image & is protected by a limited 2-year warranty. Intelli Seek Calculates optimum seek speeds to help lower power consumption, noise &, vibration Key Features 4TB Storage Capacity 3.5" Form Factor 6 Gb/s Buffer to Host Data Transfer Rate 150 MB/s Sustained Data Transfer Rate 64MB Cache 5, 400 rpm Rotational Speed 300, 000 Load/ Unload Cycles No Touch Ramp Load Technology Intelli Seek Consumes an Average of 5.3W Specifications Formatted Capacity: 4TB Interface: SATA 6 Gb/s Advanced Format (AF): Yes Form Factor: 3.5" Ro HS Compliant: Yes Buffer to Host: 6 Gb/s Host to/from Drive (sustained): 150 MB/s Cache: 64 MB Rotational Speed: 5, 400 rpm Load/ Unload Cycles: 300, 000 Non-Recoverable Read Errors per Bits Read 12 VDC ±10% (Peak): 1.75 A Average Power Requirements: Read/ Write: 5.3 W Idle: 3.4 W Standby/ Sleep: 0.4 W Temperature: Operating: 32 to 140°F / 0 to 60°C Non-Operating: -40 to 158°F / -40 to 70°C Shock: Operating (2 ms, write): 30 Gs Operating (2 ms, read): 65 Gs Non-Operating (2 ms): 250 Gs Acoustics: Idle: 25 d BA Seek (average): 28 d BA Dimensions: 1.028 x 5.787 x 4.000" / 2.611 x 14.699 x 10.160 cm (width ± 0.01" / 0.03 cm) Weight: 1.50 lb / 0.68kg (± 10%) Box Contents 1 x WD 4TB Blue 3.5" Hard Drive