Disk space refers to the total space available for a user to store files on at any time. Files may be any type – HTML, images, videos – and at any single given time, the total file size may not exceed the disk space. How much disk space you need depends on what type of media and interactions you’ll be hosting through your site. Your email account’s storage is also counted in disk space, so if you have large files that will sit in the account, which will boost your disk space needs. Remember that although you might not need much space now, you want wiggle room to expand and grow in the future, without switching hosts.