nec spikes benq scans

[chewy]

_NEC DVD_RW ND-4551A 1-07 (ATA)

 

Media Information:

_NEC DVD_RW ND-4551A 1-07 (ATA)

Current Profile: DVD-R

 

Pre-recorded Information:

Manufacturer ID: MCC 03RG20

 

 

 

the phillips media

 

I wonder if a liteon would confirm the spike or minimize it?

Edited April 14, 2006 by chewy

[Pain_Man]

For my edification, to further my aspiration to join the vaunted ranks of the Beta Team (I know I'm not but I can dream, can't I? Plus lightning seemed to think I already was a BT member )...

 

What exactly's meant by a "spike", aside from the literal meaning of course.

[chewy]

http://forum.imgburn.com/index.php?showtop...t=0entry13338

 

with the nec >8x burns and scans by benq you see a lot of screwy results, even the 4571, QR of 89% but POF total of 1030

 

4551 an enormous spike at 2.5 gigs

 

these spikes tend to not be reported in liteon and plex scans

 

read a few theories, nothing concrete

[LIGHTNING UK!]

I don't think the mb/gb amount even comes into it. It seems to be when it passes the 12x speed.

 

Even 12x burns have it because, for some reason, the Nec ends up burning at 13.1x max.

In such cases, the spike is much later on - but still inline with the 12x speed value.

[chewy]

lightning,

one of the theories said it's related to relinking, but your graphs don't confirm, another reference said empty blocks in the data?

Have you tried scanning one of those spikes in a liteon or plex?

 

The benq's have a tendency to exaggerate(not good or bad) certain flaws in burns.

Beauty is in the eye of the beholder!

Edited April 15, 2006 by chewy

[LIGHTNING UK!]

Surely relinking would be happening ever time wopc kicked in. After all, it must be stopping the burn for a split second so it can do it's checking.

 

Obviously not every wopc cut in point is leading to this spike.

 

Also, relinking could occur when the speed changes. Again, no spike at this points.

 

When the spike is visible, there is nothing else in the write speed graph to show anything is happening. If it was at a speed change point, I could almost understand it.

 

Yes I've scanned in a liteon and I know the problem is only visible on BenQ's. The weird thing is, why do no other drives show this problem on the BenQ's, and why no other drives show this problem apart from the BenQ's!

It seems we're in a position where neither drive can really be blamed.

 

I was impressed that some 16x burns on the 4571 don't show the spike, whereas 4551 and 4550 do. So I guess NEC did fix something - either in the newer hardware or the drives firmware.

[Cynthia]

I don't think the mb/gb amount even comes into it. It seems to be when it passes the 12x speed.

 

Even 12x burns have it because, for some reason, the Nec ends up burning at 13.1x max.

In such cases, the spike is much later on - but still inline with the 12x speed value.

I don't use the 12x speed burning with my Nec 4551 any longer. 8X works better.

 

Two burns - the first with a smaller image and the other a full image. Both at 12X speed.

 

 

 

 

Edited April 15, 2006 by cynthia

[LIGHTNING UK!]

Shame they're missing the write speed graphs.

 

Still, I can take an educated guess that the drive reaches 12x at around the 3.8GB mark

 

Interesting that the NEC also shows it's own spike. Cool

[Cynthia]

Better to use DVDInfoPro? I'll do a new scan.

[chewy]

the nec's show it more exaggerated than the benq's

[LIGHTNING UK!]

cynthia,

 

You need to use the IBG file from ImgBurn (if that's what you used to burn it). That's what gives you the write speed graph.

 

chewy,

 

lol 3000 PIE.... yeah just a bit!

[Cynthia]

Two more pictures.

 

Scanned on the Pioneer 110D

 

 

And a scan with DVDInfoPro with the Nec 4551

 

Edited April 15, 2006 by cynthia

[chewy]

here's a datadisk nec 3550 @ 16x yuden T02(8x media) dvd+r sony brand

 

quite informative about the lousy nec error correction

 

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Edited April 15, 2006 by chewy