Carmack: Blu-ray is advantageous for RAGE and Doom 4

John Carmack has been discussing the advantages and disadvantages of PlayStation 3 versus Xbox 360 development, stating that while games don't require as much compression on Blu-ray, less "sweat equity" has been expended into his studio's Xbox 360 projects.

Upcoming id title Doom 4 will "almost certainly" come on three discs, Carmack told GameInformer in an interview, as reported by VG247, although the studio is working on compression methods that will enable RAGE to ship on just two, since the nature of the game doesn't suit more than that.

"We would love to set the thing up where it filled one Blu-ray disc versus three DVDs, which is about the right mix, but the game just…we can't cut it into a third like that," said Carmack.

"We can cut it into two pieces. We've got two large wastelands on there. We just couldn't make an arbitrary cut."

He doesn't foresee the same being a problem for Doom 4, however.

"Doom 4 is being set up so that it's almost certainly going to be cut up to three DVDs versus one Blu-ray. At least they've got the ability because of the way it's structured."

Storage space aside though, it's been easier for the studio to reach its current development stage on Xbox 360 than it has on PlayStation 3, Carmack revealed, although the Sony console does offer more raw performance.

"The 360 was easier to certainly to get to where we are now. More sweat equity had to be put into the PS3," said the id creative director.

"There's a little bit more theoretical raw performance on the PS3, so we've got a little bit more headroom."