This hard drive was a replacement for the internal drive in a Dell 1525 laptop. The old drive was damaged and not functional. Installation was very simple: remove two screws, slide out old drive, remove the fascia screws and switch it onto the new drive. After sliding in the new drive and replacing the two screws, boot up from the CD using the Dell re-installation disk. The BIOS found the new hard drive without any intervention, and Windows Vista installed without a hitch. Dell's driver disk had all the needed drivers which were also simple to install. Everything works fine.