DVDInfoPro V4.50 now supports the 716A

The NEW DVDInfoPro V4.50 now support the Plextor 716 Drives. I am using it on a 716UF attached via Firewire. I understand that the "Jitter" is calculated and it appears to report a value about 10% higher than it should be. NicW knows about the problem. I love this product, so much better than PlexTools. See attached examples:

Cue "Takeshima" in 3... 2... 1...

Thanks for the report, beach-hobo, interesting development.

Interesting development indeed. Since Plextor up to now actively worked against such developments, is their position to this known? Did they officially consent or ist this another 'i do it anyway' approach?

It's more like a 'let's find out what Plextor will do' approach

Good! Good! Good!

Finally someone who "believe" in PX716 scanning!

How many time the community has asked this to the author of CD/DVD Speed?

Thanks to the author of DVDInfoPro!!!

thanks for the news...interested to see what pans out wrt this new scanning option...

just tried it for the first time with my plextor using verbatim 16X media

Thanks to all for your comments so far. Its your requests that got this done. We are trying our hardest to make this feature what you want it to be. We need ideas, scan data, feature requests, alterations, etc. The more feedback we get the better we can fine tune this for you.. Please send data comparisons especially jitter with Benq and Plextor or other feedback to the DVDInfoPro mantis site and we will look at each one carefully. Alternately please send to Zebra who gathers and sorts all the feedback.

The mantis site is here: http://dvdinfomantis.sneddo.net

cheers
NicW

If you ever succeed in extracting useful values from the jitter tests, let me know

Good News Wow

Gee I dont know, after making his daily Plextor and LiteOn corporate dumpster rounds, it looks like Zebras hands are already full!

It also support the PX-712.

i was wondering why the jitter part of the test drops the quality score so much? i watched when it was scanning and seen my score was a little above 98 then as soon as the jitter test run it dropped to the score you see in the attached picture.

12.3-12.6% jitter is approaching the upper limit for acceptable quality (13% i believe)...

i assume the Speed / Accuracy setting determines at what speed the test is conducted? does it also skip sectors like Plextools "Test Interval Length" setting?

there are 4 selections- accuracy, balanced, faster and fastest.

i am not believing the readings for jitter, nero cd speed reports lower numbers than it

i'm aware of the 4 settings, just wondering about details of them...

re: jitter - first post says "I understand that the "Jitter" is calculated and it appears to report a value about 10% higher than it should be. NicW knows about the problem."

The #1 message in this THREAD got it's data from the "SpeedLabs" site which Zebra runs. I hope NicW or Zebra will comment on the reported JITTER problem and why it's calculated. One think that I haven't tried is using different speeds and see if that changes the jitter values...

Yeah and how would you change the scan speed for jitter?

AFAIK specifications call for a maximum of 9% for +R and 8% for -R.

Methods for testing jitter on DVD+R's are laid out in ECMA-349 guidelines, especially section 29.4 p.77
Note also (charts) in Annex D p.85ff.

Don't think our DVDRW drives are designed to meet those requirements...

Rather:

30.2.5 Jitter

Jitter is the standard deviation σ of the time variations of the binary read signal. This binary read signal is created by a slicer, after feeding the HF signal from the HF read channel through an equalizer and LPF (see Annex E). The jitter of the leading and trailing edges is measured relative to the PLL clock and normalized by the Channel bit clock period.

The jitter shall be measured at the Reference velocity using the circuit specified in Annex E.

The jitter measurement shall be using the conditions specified in 29.4.

The measured jitter shall not exceed 9,0 %.

Hard to say since writing is always dependant on drive AND media. Fortunately most drives seem to have no problems reading back disks with (common) Jitter like 12% and some even tolerate higher values (up to 20%) without problem. Nevertheless one should try to stay within the specs....

cheers hwp...wonder where i got the 13% number from....

Sorry for going of topic, but I think I have to clarify my post above.- "Refence velocity" = 3,49m/s = 1x DVD speed.
None of our quality/jitter messurements nowday are done at that speed, are they?

- "the circuit specified in Annex E"
Is this "circuit" part of our drives? My guees, probably not.

- "conditions as specified in 29.4".
Only a refernce drive can meet these mechanical designs. But than I'm not that knowledged of (all) hardware our drives are using for quality/jitter messuring.
Maybe one of our more knowledged member can enlighten me.

On this page we can read about how PlexTools with Plextor drives reads and reports jitter.
And here you can read about how Pioneer sees it.

This and much more leads me into conclusion the ECMA standard for jitter can't be directly compared with our jitter testing when using DVDInfoPro (and/or Nero CD-DVD Speed for other drives than Plextor).

Finally hwp, it would be nice if you can take your time and explain in simple english what this part of your quote means; Thanks.

Yes i think some clarification is necessary. Especially since i was talking about Jitter LIMITS in absulute numbers whereas you were talking about Jitter measurement METHOLOGY and i fail to see the connection.

Nope. It's 2x.

I think you're right.

Yes and no.

The consensus on this is that "consumer-grade" measuring methods as they are offered by Plextor drives (and partially by other manufacturers too) are only usable to determine trends (for ex. raising error rates towards the outside of the disk) or fundamental problems (POF) but do not enable us to make valid comparisons on acutal "values" like 8.3% vs. 10.1% Jitter. That is to say, if you want to say for sure of your DVD-burn is within the 9% limit you can't do so with this equipment. If your drive says it's 9% then there is a relatively good chance that you are close to the limit or not far above it but again the value is not comparable. Strictly speaking the results are not even comparable on the same drive, since the environmental conditions are never quite the same.

True! It's an approximation only and should be interpreted accordingly (fro ex. don't fret about an extra percent of Jitter or two as long as it's within reasonable limits).

I rather doubt it would help this discussion any...