Originally Posted by
Gametrek
CDs reads like Cassette tapes. In order for the data to be played it looks up the index, which is usually located on the inner-most-tracks and literally go to it's location by browsing the entire disc ( which looks like less then a second but is really a long time ).
When you backup a Disc, you will most likely backing up as indivisual tracks with an index file used to
look up the information on those tracks. Imagine.
Game loads
Data located on track 01
Song/vocals located on 02 at 00.00.00 location.
Most PC-Engine, SEGA-CD, Saturn, and some PSX games works this way. PSX actually can have games and various content in data-mode creating a multiple boot disc that works cross platform.
Remove the audio/video content and your left with a file that is usally less then 50mb in most instances. The SFC/SNES had "Star Ocean" which is probably the biggest game on the system
along side "Far East of Eden:Zero" that holds around 56-98mb of data. They had to have extra
storage just to hold these games. Amazing fact that "Star Ocean" on the SFC is actually better in
every other way then any other remake of the game as with "TOP"
With a CD you can loads FMV, and Audio data with next to no compression.
Games got bigger over time because of uncompressed data and larger bitmap files
for the higher resolution and various media formats.