No. You can add a different hard disk with which the laptop comes without affecting the warranty of the computer, however, if in the future a fault is reproduced in the computer and you take it to repair with Acer technical support, they will determine that the fault that presents at that time the computer, may have been caused by the manipulation of adding the new hard disk, the possible repair will be made under budget, otherwise, if the fault, has no relation to the installation of the disk, it will be treated within the standard warranty.