bad media, bad scan or bad un-riplocked BenQ drive?

dodecahedron

(sorry in advance for the long post and large number of pics).

prompted to try media scanning at high speeds by the discussion in this thread
http://club.cdfreaks.com/showthread.php?t=193164
i finally used MCSE to remove the riplock from my BenQ DW1620 B7W9.
then i took a data DVD containing backup data that i'd burned a few days ago, burned on my LG GSA-H10L firmware LL11 (unmodified in any way), and scanned it and was unpleasantly surprised.

the TRT on the LG is just fine (there are a few wriggles on the curve, but i never get any better than this, never get a 'perfect' curve with no wriggles). the 8x scan on the BenQ is OK, roughly what i usually get, roughly what i got from other discs of this media (and taking into account that it's a BenQ scannign a burn of an LG H10x drive).

(i never get great scans like i see on the forum i don't know if it's because of lemon drives, or something with my system, Athlon XP2000+ not good enough, not enough cooling/high temps in the case, no-good PSU)

i'm really upset. needless to say i'm very alarmed by this.
i don't scan all my burns, but usually do (esp. data backup) and am used to what i got with the LG, Toshiba and 8x BenQ TRTs and 8x BenQ Disc Quality Scan.
so far i assumed that these are OK, if not great, burns.
but now after the 16x TRT on the BenQ i'm really worried!
pics below.

now i think maybe all my burns are bad ?

i don't know what to make of it:
bad batch of media?
Verbatim DVD+R 16x, MIT by CMC (according to cakebox and serial starting with PAPA...), stamper code ZD3056-DVR-T47D)
a bad burn?
a problem with the riplock-removed B7W9 firmware for my BenQ 1620 ?

i'd greatly appreciate any comments.

pics:
1. TRT on the LG GSA-H10L LL11
2. TRT on Toshiba SD-M1712 DVD-ROM
3-5. TRT on BenQ DW1620 B7W9 (MCSE speed-hacked) @ 8x, 12x, 16x resp.
6-8. Disc Quality Scan on on BenQ DW1620 @ 8x, 12x, 16x resp.

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scoobiedoobie

It looks to me to be more an issue with the drive rather than the media, the way it is topping out at 10x. Your 12x and 16x PI/PIF tests are not topping out at 10x though, but there is a slight increase in reported jitter around 12% that coincides with the 10x limitation in the TRT.

A couple things to know: Benq drives become particularly sensitive to jitter levels of 12% and higher, so it may just be that the combination of higher read speeds and high jitter that is causing the drive to limit its read speed. It's also known that Benqs are picky about discs burned from your model of LG drive, so that is probably another factor to consider. Whether the LG is truly creating discs with jitter that high or not, I don't know. If they are, that just comes with the territory of Benqs and their dislike for discs with high jitter levels.

In any case, I would not be too concerned about your burns. Because of the Benq's higher reported jitter levels, the error levels are probably being inflated a fair amount. Your Benq will generally do a very good job of testing discs but for burns from you LG it is not the best choice, in that situation you'd be better off with a Liteon as it is not as sensitive to higher jitter levels, regardless of whether those jitter levels being reported by your Benq are accurate or not.

Confused yet? Long story short, your burns are very likely just fine.

BeardedKirklander

I have found messing with firmware seems to cause me more trouble than it is worth.

Perhaps back-flashing to a previous firmware, testing it, then seeing if the standard B7W9 flashes successfully might be worth a shot?

TL0

The PIF being reported by your 1620 in the 8x scan is within the range I have experienced so far with my current batch of CMC MCC004 media (ZD5136). What write speed are you using? as that can influence the results?

You may wish to try the Qscan option in Qsuite on your BenQ 1620 to see how the FE/TE scans on a blank disc from that batch. If it's acceptable at your chosen write speed, a burn done on the BenQ 1620 would help show if it was media related or a BenQ scanning/reading incompatability.

dakhaas

OFFTOPIC

I can say that some folks are currently looking into this one.

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zevia

As scoobiedoobie suspected, there is data transfer rate issue here. Did you put the drive(s) internally? What is the burst rate?

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