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Dark_Feanor said:
The time to install the full game on both consoles, if the game have the same size, is about the same. There is no magic that could overcome the physical properties of the BluRay bandwide reading.

The time start playing some missions or levels depends on how developers arranged the data for streaming and instalation.

Sony also put a extra chip to speedy up things and intensively encourage devs to use the feature. Microsoft on the other hand basicaly ignored the issue, it wasn´t necessary extra work to save two or three minutes once.

However the real problem lies when installing updates during the first install, that is what takes time. This should be fixed as most games are coming out with gargantuan first day updates and content.

Interestingly this "issue" has been so overlooked that since last year launch title I haven´t seem any site doing face-off of instalation times.

Physically a 6x CAV blu-ray drive cannot read faster than 1.6 GB per minute which slows down to 675 MB per minute towards the inner circle of the disk. A game like Alien Isolation at 18GB install (I think it is, not sure) cannot install faster than 12 minutes, maybe 6 with compression.

I think the solution Sony chose is far more simple. Read from the blu-ray if the data is not available on the hdd yet. I've noticed a bit of choppiness and late texture streaming issues in a few games on first time playing, which disappears after the disc stops spinning. Update files don't interfere as they replace files on the hdd, hence the updates are so big nowadays. No more patching binary files, simply replace.