Seagate ST9500325AS Internal 2.5 Inch Hard Disk Drive

Seagate ST9500325AS is a 500 GB, 2.5-inch internal hard drive in the Momentus 5400.6 family, built for notebooks and compact systems that need solid capacity with mobile-friendly power efficiency. It spins at 5,400 RPM and uses a SATA 3.0 Gb/s interface with NCQ, backed by an 8 MB cache and an internal transfer rate up to 1,175 Mb/s, delivering responsive everyday performance for boot drives, applications, and data storage. The drive measures 9.5 mm in height with a 69.85 mm width and 100.5 mm depth, weighing about 98.8 g, which suits slim laptops and small form-factor enclosures. QuietStep Ramp Load technology and G-Force protection enhance durability when carried or transported, while the typical seek time is approximately 14 ms and average latency 5.6 ms. Power consumption stays modest: ~1.54 W during seek, ~0.81 W idle, and standby around 0.22 W. It uses 512-byte sectors, and Seagate specifies a load/unload cycle count greater than 600,000 with an AFR of about 0.48%, reflecting reliability for daily notebook workloads. With two disks and four heads, the ST9500325AS offers a straightforward upgrade path for upgrading older laptops or adding internal storage to compact systems and external housings, providing dependable 500 GB of storage in a compact 2.5-inch package.