Originally Posted by an9el
If a 360 programmer gets problems because of insufficient disc space, he can simply add a second disc. But what does a PS3 programmer do to workaround the slow data transfer rate of the 2x BD drive (which is half as fast as the 360's DVD drive)? Currently, the user has to manually copy a large amount of data onto the HDD (4GB for Genji). The finite amount of disk space in mind, especially on the lower-priced 20GB version, this can't be a solution for the future. Furthermore it's anything but comfortable.
One BD + manually copying 4GB or more of data onto HDD is more expensive in production and more uncomfortable for the user than two DVDs which have to swapped onced in 10 to 20 hours of gameplay. I don't see where Sony has planned for the future here.
If using one BD disc + using harddrive space was more expensive for production then they would simply use another disc. I don't know how familiar you are with disc production and game design, but adding another disc is a pretty annoying thing for developers to have to deal with, and it ends up costing them more money.
Most games use harddrive space to help quicken load times, newer games, like Ninja Gaiden Sigma, are taking advantage of it for those exact reasons, giving the user a choice of whether to install a lot to reduce load times to virtually nothing or installing little and dealing with the normal wait time. This same trick has been done with great success on the PC for years. To think of it as a downside is silly, since the PS3 presents all the same options to developers and gamers as the 360, plus many more.
Also, the Playstation 3 has more games coming out for it this year than any of the other next gen systems. Just thought that was an interesting and little known fact.