The Momentus family of 2.5-inch laptop drive offers innovative options & features, such as capacity up to 750GB, two different performance speeds, & three significant features. Key Features & Benefits Seagate Smart Align technology provides a transition to 4K sectors without the need for software utilities. Seagate Self-Encrypting Drives deliver government-grade encryption without performance degradation—protecting your data where it lives. Seagate G-Force Protection technology can detect when your laptop is in a free-fall, swing the drive heads to a safe zone & keep the data safe. 7200-RPM & 5400-RPM speeds for customized performance, & 8MB & 16MB cache size to enhance your application performance 750, 640, 500, 320, 250 & 160GB models for 5400-RPM drives for high-capacity to entry-level & mainstream systems 750, 500, 320, 250 & 160GB models for 7200-RPM drives for high-capacity & high-performance systems Specifications Model Number ST9500423AS Interface SATA-II 3 Gb/s Cache 16MB Capacity 500GB Guaranteed Sectors 976, 773, 168 PHYSICAL Height 9.5mm Width 69.85mm Length 100.35mm Weight 115g PERFORMANCE Spin Speed (RPM) 7200 RPM Average latency 4.2ms Random read seek time 11.0ms Random write seek time 13.0ms I/O data transfer rate 300MB/s Unrecoverable read errors 1 in 1014 RELIABILITY Annual Failure Rate 0.5% POWER 5V start max current 1.0A Average idle power 0.96W Average seek power 2.5W ENVIRONMENT Ambient Temperature Operating 0°–60°C Nonoperating -40°–70°C Maximum operating temperature change 20°C per hour Maximum nonoperating temperature change 35°C per hour Shock Operating Shock (max) 350 Gs for 2ms Nonoperating Shock (max) 1000 Gs for 1ms ACOUSTICS Acoustics (Idle Volume) 2.3 bels Acoustics (Seek Volume) 2.5 bels Features Storage Type HDD Smart Align Yes