Good job, MikeB. I've had to correct people too many times.

I am curious why anyone would not use an optional install, though.

Thanks, I agree a (mandatory or) optional minimal install can make good sense. I think a 250 MB to 1GB partial install per game shouldn't be a problem, it can help boot-up times as well as better in-game performance for often used files.

IMO the bulk of graphics and audio should be optimised for to stream off disc. The Blu-Ray drive generates very minimal noise and is very competent for streaming uses, at maximum streaming speeds of 9 MB/s a 25 GB Blu-Ray disc can be streamed in only 46 and a half minutes.

It means the game cant read more than 72mbs per second or it will lag.

Its not the ram its Disc read speed.

That they are not. DVD is CAV and has a minimum and maximum read speed, BD is CLV and has a constant read speed.

@Garnett: That's true only when streaming data. Notice that if the games were streamed, in the way you suggest, the biggest game with the 72Mbps would be 48 minutes on a single layer BD and 96 on a dual layer. Notice where the logic fails?
The "lag" is the loading break between levels, when it takes a little short of half a minute to fill the RAM up again and games are run from the random access memory.

@Feylic: I'm pretty certain that the standard "1x" speed is constant through the disc.

Look, the lowest drive speed for CAV is about "3x" speed, due to the "1x" transfer rate in the inner end roughly equals "3x" in the outer end (for BD, this minimum would be about "4,5x", because the required minimum bitrate "1,5x", is needed in the inner end).

Also, you mentioned the "12x" BD drives yourself, but that's the maximum on 10 000 RPM at the outer end of the disc on a CAV drive.

WHOA!
That's awesome. Those ruttin' installs are killin' me. I'd surely welcome the day when those things are a thing of the past.

@bdbdbd: I don't know if i quite understand what you are trying to say.. The 1x, 2x, 3x, 4x, ect... is constant for dvds, but it is not the same as the 1x, 2x, 3x, 4x ect for BD, or regular cd's for that matter.

As for the 12x BD, I don't know what the maximum is, it just depends on whether they can keep the disc from wobbling at higher rpms.

@Feylic: I'm saying, that whether the drive is CAV or CLV, doesn't depend on the type of disc it's using.
Standard BD transfer rate is about 3,4 times standard DVD.

@bdbdbd: Ok, but i fail to see the point you are making. Yes the drive doesn't depend on the type of disc to be CAV, or CLV, but the disc depends on the drive to be able to read it, and with BD you use a CLV, and DVD you use a CAV. and yes, the transfer rate is 3 to 4 times standard dvd for each x.

@Feylic: There's no CAV disc or CLV disc. The discs are the same. Only the drive is different. If you have a DVD drive, that is "2x" or lower, it's a CLV drive, since in case of a CAV drive, the slowest drive speed would be slower than the standard. If we have a DVD drive that's "3x" or above, it's usually a CAV drive, because the slowest speed exceeds the standard and it equals the nominal speed in the outer edge.
For BD, the minimum rate is "1,5x", when it raises the required amount of "times" by 50% for CAV drive. Believe me, there's no sense in making CLV drive when CAV is essentially faster.