It is natural course of events that it has a risk of losing stored data by crash or some other accident. And, it takes a great deal of trouble to look for images desired if they are stored in the same place. Even if it has the large storage capacity, if it is used it will be occupied in due course of time. Therefore, it may be a clever choice to store image data that has large file size in the other place. Floppy disk is typical.
ZIP disk is something like a developed form of floppy disc.
We shall be puzzled among too many choices. In the field of high density data storage, the technology progresses everyday. New technologies and standards are coming one after another. It is necessary to select one with due consideration of compatibility including future prospect. Calculated from these, number of images stored in each disc is as shown in the table.