You can store in the GN4 database or file system different content, having different average disk usage average.Here are some hints to help you out in estimating the needed disk size.

AUDIO

The below table shows in how many MB can be compressed the 1 minute of music at different bit rates. The increase of the file’s size is proportional to the increase of the bit rate, if the bit rate doubles the file’s size will also double.

Generally speaking, 1MB corresponds to 1 minute of music encoded at 128 Kbps, which is the MP3’s standard bit rate. It is important to notice that a song based on the WMA format needs 50 % less storage capacity than one based on the MP3 format, and still attain equal audio quality. Moreover, the WMA format can use the regular bit rate of the MP3 format, 128 Kbps, for achieving CD quality sound.

Another way to compare the above audio formats is by audio compression ratio. It indicates how many times an original audio file from an audio CD, with a standard bit rate of 1411 Kbps, can be compressed. The below listed audio compression formats deliver equal sound quality, near CD quality, through different compression ratios.