Some old MacBooks come fitted with hard drives (HDD), which are rather slow and fragile when compared with Solid State Drives (SSD). If performance and speed are a concern, you may want to replace the HDD with an SSD. SSDs boot and transfer data faster, last longer, and can survive the impact of a drop. However, they cost a bit more than HDDs. MacBook repair service providers can help if you don't know your way around this procedure. Read more at https://bit.ly/3hlj8Ig.