check your harddrive if you have PATA or SATA. easier if you buy the same brand and type but of higher capacity (ex. Hitachi ATA-6 60GB to Hitachi ATA-6 80GB). if you want a different brand, go always with the same type (ex. Seagate SATA 80GB to Fujitsu SATA 120GB). Specify that you need a laptop hard drive.