<<24x - 3.33 mins*
32x - 2.5 mins*
40x - 2.0 mins*>>
*Note: In a perfect world only. You can always dream about those times. But the reality is, there is no way to achieve CLV at 24x, 32x and 40x. All manufacturers have taken approaches to "solve" that problem, most of them chose to use the Zone-CLV(Z-CLV) technolgy, which basically means the burning is divided in to zones and each zone is written at a certain speed. For a 40x CD-RW, the drive starts writing the first zone at 20x. At about the 10 minute mark, writing pauses then starts the second zone with the speed increased to 24x. At the 30 minute mark, the writing pause again then enter the third zone with the speed up to 32x. Finally at about the 58 minute mark, the drive enters into the final zone and achieves its maximum writing speed of 40x. So, "40x" really is incredibly misleading because the drive ends up with an average writing speed of just about 30x. In a Z-CLV environment, the increments look more like this:
16x - 5 mins
24x - 4 mins
32x - 3 mins 40 secs
40x - 3 mins 25 secs
The other type of technology is called Partial-CAV(P-CAV), only Yamaha utilizes this technolgy right now. It's essentially the same idea as Z-CLV, writing starts at a slower speed, increases the speed as the time goes by, and finally reaching the maximum at a certain point. But the advantage of P-CAV is that it does not have any "zones" like Z-CLV. If I can use one or two words to describe the difference, make the words "slope" and "steps", the Z-CLV takes steps to reach its maximum speed, while the P-CAV takes an upward slope to reach the maximum. P-CAV creates a higher overall averange speed than the Z-CLV; the results are evident, 24x Z-CLV burners take around 4 minutes to burn a 650MB CD, a 24x P-CAV burner shaves 10 seconds off and finishes a 650MB CD in 3 mins 50 secs.
Im afraid we will only see P-CAV and Z-CLV burners from now on; true CLV burning is just impossible to do in high speeds like 40x. So, because of this, the improvements in the burning times will be less and less. As you can see, you only save about 15-20 seconds going from 24x to 32x, or from 32x to 40x. I think we've pretty much squeezed all the juice out of the current technologies(Z-CLV), unless the manufacturers think of a new way to improve speed, Im afraid the improvements just won't be impressive enough for everyone to upgrade.
But if already have a 24x cd-r drive and are upgrading to 32/40x, all i can say is you must be stoopid
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