Hitachi Travelstar 5K100 DK23FB-40 40.01GB 2.5" 5400RPM 8MB Cache ATA-5 IDE Internal HDD Hard Disk Drive.Product Line Series: Travelstar 5K100Hitachi Model Number: DK23FB-40HP Part Number: 336471-001 318050-001HP Spare Part Number: 344405-001 309473-001Specifications:ModelManufacturer HitachiManufacturer Model # DK23FB-40Product Line TravelstarProduct Series 5K100PerformanceProduct Type Internal Hard DriveForm Factor 2.5-inchCapacity 40.01 GBCache 8 MBSpindle Speed 5400 RPMAverage Seek Time 12 msDrive Interface Type ATA-5(IDE)Features - Load/Unload Technology- Fluid Dynamic Bearing (FDB) Motor- Enhanced Adaptive Battery Life Extender- Antiferromagnetically-coupled (AFC) Media- Partial Response Maximum Likelihood (PRML)- Giant Magnetoresistive (GMR) Head Technology