Compatibility500GB HARD DRIVE FOR Apple Macbook Unibody A1278 / A1342Hard Drive Features:Ultra Quiet : new standard in quiet and is designed to minimize mechanical excitation generated by any resonanceNoise Guard technology that is a combined technology to eliminate each noise source or to minimize energy transmission. First, modification of the spindle motor's design minimizes the noise source. In addition, the cover is designed to optimize the flow of air. The Damper utilizes vibration absorbing material, installed on the area of highest density, which maximizes the transmission of energy to the outsidFluid Dynamic Bearing Spindle Motor for lower acoustics and increased non-operating shock toleranceEnhanced Adaptive Battery Life Extender 3.0 for maximized battery lifeS.M.A.R.T. compliant detection system that gives advanced warning of possible drive inconsistenciesRamp Head Load/Unload technologyStiffness-reinforced base casting construction offers enhanced stability and greater vibration/shock resistanceConsume low Verified – spins at 5400 RPM for fast performance but has Verified specifications similar to slower 4200 RPM drives. Low Verified consumption yields longer battery life and increased overall reliability.To my valued customerIf you have any problem when you received the item, please feel free to contact us first. We are responsible seller. We will try our best to help and fix your problem for sure. Your feedback is very important to our store. They are always the valuable suggestions to improve our service better and better. Wish you shopping pleasure!