Originally posted by rdgrimes
[B]You're partly right. The data density is equal throughout the disc at CLV, but is zonal at Z-CLV.
I thought Z-CLV is working just like CLV, but there is a slight pause for motor to basically change gear into faster speed. Motor now can spin disc at greater Linear Velocity. By doing so, it can cover more surface in the same amount of time, thus laser can burn more surface of discs with the same amount of time. Thus, resulting in higher burning speed zone. All this is done by maintaining same data density on discs.
If it is zonal, i think DVD player / DVD-rom will have a hard time reading different data density back from the disc.
AS for vibration, the displacement (lateral movement) is the same on all parts of the disc. The inside can't move less than the outside - they are connected.
Sorry, i meant the discs wobble effect can be felt more on outer edge. Think about unbalance spin, discs are moved (up and down) much faster compare with inner part. Also, when spinning at lower speed, discs are less stable (tend to wobble more.)
I agree with you. I think it is more the way they producing blanks. Maybe the process can cause more flaws on dye toward outer edge more than the inner.