But, if you have limited disk spaces left etc and don’t really need that type of features, it can come in handy though).
Because when you create a “.mdf” disc image, that image will usually be bigger than the actual size of the disc (perhaps it contains some error recover data which can be useful at times.
Not just that, but by converting those images, you can actually save some disk space too (after converting to “ISO” format for instance). If you use the CD/DVD burning tool called “Alcohol 120%” or “Daemon Tools” heavily in MS Windows and has a reasonable amount of disc images created in the “MDF/MDS” format but just figured out that you cannot burn them in GNU/Linux (say that you recently switched over to Ubuntu Linux! :D) as with “ISO” disc images, then this small, yet extremely useful tool called “mdf2iso” might save your day -).