What is the impacts of hard disk in relation to computer performance?

Two major factors that impacts computer performance related to the hard disk drive are how the file is/files are scattered across the hard drive (known as fragmenting) and the location on the drive. Fragmenting makes the hard drive have to scan more to get the "file in question's", and location on the hard drive is because the further out from the center of the disk the data is, the faster fetching the data will be (Statistically data saved on the outmost edge is twice as fast as data on the inside