This depends on what you are buying. A single song download is roughly 4 meg. A full record can be in the 50 meg+ range. Downloading a whole previous year or a film file can meansure in the gigabytes. Be sure to have a stable and fast internet connection if you are downloading large files. The larger files are likely to be zipped. Most modern computers will automatically know how to unarchive a compressed file. You will then need to import them into the program you want to use. For example, if you download a complete album of music or video files you would want to unzip them and then import them into a program like iTunes.