A solid-state drive (SSD) improves the performance of any application running on it in comparison with a classic hard-disk drive (HDD). The reason is that an SSD works by using a variety of interconnected flash memory units, so there are no physical parts to move. In comparison, an HDD uses spinning disks and any reading or writing process causes the disks to move, which means that the speed of an HDD is limited. As the prices of the two kinds of drives are different as well, a large number of personal computers and web servers are set up with an SSD for the OS and various applications, and a hard-disk drive for data storage, in this way balancing cost and effectiveness. A website hosting provider may also use a solid-state drive for caching purposes, thus files that are used regularly will be held on such a drive for accomplishing better loading speeds and for minimizing the reading/writing processes on the hard-disk drives.