Disk space or disk capacity is the total amount of bytes that a disk drive or disc is capable of holding. Typically, the storage device is the computer's hard drive, but it can also be a USB thumb drive, CD or DVD, a memory stick/card, or a floppy disk. In hosting terms this refers to the space available to you on the server's hard drive. This space is used to store your HTML files, emails, images, audio, log files and other files that make up your website. Disk space is usually measured in kilobytes (KB), megabytes (MB), gigabytes (GB), or terabytes (TB). For example, a hard drive that is 500GB is capable of holding 500 Gigabytes of information.