Seagate Barracuda 400 GB - 7200.10 - Hard drive -  internal - 3.5" - SATA-300 - 7200 rpm - buffer: 16 MB - ST3400620AS Seagate Barracuda ST3400620AS 400 GB Serial ATA Hard Drive General Features: 400 GB storage capacity SATA/300 7200 RPM spindle speed 16 MB buffer 4.16 ms average latency 8.5 ms random read seek time 10 ms random write seek time Perpendicular recording technology Whisper-quiet operation Enhanced G-Force Protection Clean Sweep calibration Directed Offline scan diagnostics