A disk cache is a buffer memory used to speed up storing and accessing data from the host hard disk. It allows faster processing of reading/writing, commands and other input and output process between the hard disk, the memory and the computing components. A disk cache is also directed as a disk buffer and cache buffer. A disk cache generally stores data that a computer program has read. When it receives new information, it stores it in its cache instead of waiting for it to come from the hard drive. It reduces access time for frequently used data. Disk caches are typically small compared to total memory capacity, so they do not simultaneously store all information accessed by a computer program. Instead, they hold only recently accessed data that is expected to be used again soon (a technique known as locality). The disk cache is a device that makes your computer run faster. It's a little bit like the one on your car engine—but instead of keeping you moving, it keeps your computer running. It can be especially essential if you're doing something that involves lots of reading/writing (like gaming) or using an older machine that doesn't have enough RAM to keep up with what you want. When it comes to computers, there's no such thing as too much RAM and that's where the hard disk cache comes in. The hard disk cache combines RAM and a host/native hard disk. The idea is that when a user or program requests data, the operating system first reviews the hard disk cache to see if it's found what it needs. If it has, then the OS and memory quickly deliver the data to the program. It means less time waiting for the computer to process information, browsing the internet, or playing video games! It is also known as a soft disk cache because it's implemented on RAM rather than on a host/native hard disk.