Yes, you can replace HDD with SSD. However, it is essential to note that not all laptops are created equal, and some may have a more difficult time accommodating the switch from HDD to SSD. For instance, laptops with a smaller casing may not have enough room to fit the additional hardware required for an SSD. If you are comfortable taking your laptop apart and doing a little bit of tinkering, then replacing the HDD with an SSD should be a reasonably straightforward process. It is also essential to make sure that you select an SSD compatible with your laptop's operating system.