Toshiba MK8025GAS 80GB ATA/100 Internal Hard Drive (HDD2188) Fluid Dynamic Bearing (FDB) motor drive for quiet operation. 4200 RPM rotational speed, 12ms average seek time, 8MB Buffer 80GB unformatted capacity ATA-6 Interface (ATA-100) for 100MB/sec maximum transfer rate 300,000 MTTF Hours