Why 3500AG sucks at 8X but superb at 16X?

vbimport

#1

I tested this many times, and my Plextor 708 beats every time my 3500 @ 8X. the same amount of data is burnt in 7:15 with the Plextor, but in 9:45 with NEC. The same brand of media Ritek every time either. Can someone explain this. Shouldnt NEC burn proper 8X speed?


#2

Shouldn’t Plextor charge a fair price for their drives? :confused:


#3

Dont get me wrong, I love my 3500. It just performs better @4X with Verbatim media (the last ones remaining). Maybe it is Ritek specific, and I dont have any other 8X brand to test. I wont buy any from now on either. I bought a lot of Verbatim 16X. It was just a question, for there is a big difference in time.


#4

Yes, it does burn properly at 8X on the 3500. But speed doesn’t matter to me. Quality does.


#5

The NEC and Plextor drives use different strategies in reaching 8x speed. The NEC uses Z-CLV (Constant Linear Velocity in a number of Zones) whereas the Plextor uses P-CAV (Constant Angular Velocity until maximum is reached, followed by Constant Linear Velocity for the rest of the burn).

It is easier to implement Z-CLV with a certain writing quality than P-CAV, but P-CAV is faster.

Here are some screenshots showing the difference. The first is Z-CLV writing with the NEC-3500AG the second one is P-CAV writing with Plextor PX-712A: