Hitachi Travelstar IC25N040ATMR04-0 40GB Laptop Hard Drive 9.5mm 2.5 inch Notebook HDD (08K0633) Hitachi Travelstar IC25N040ATMR04-0 40GB Laptop Hard Drive 9.5mm 2.5 inch Notebook HDD (08K0633) Capacity: 40GB Speed: 4200RPM Cache: 2MB Interface: ATA/IDE. Form Factor: 9.5mm, 2.5" Laptop drive.