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Lite-On SHM-165H6S Writing Strategy - What Is Lite-On Doing?

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Lite-On SHM-165H6S Writing Strategy - What Is Lite-On Doing?

Postby Ian on Mon Apr 10, 2006 3:06 pm

I've been running some tests with Lite-On's new LightScribe capable "Super AllWrite" drive, the SHM-165H6S. If you look at the first screenshot you can see that there is a dip at the 0.8GB mark. Not really a big deal considering how many dips are in graphs created by BenQ and NEC drives.

When tested with another Lite-On drive, the writing quality is fine. In fact, its actually quite good. However, when you test with a jitter sensitive drive like the DW1640, you see what that little dip is doing.

If you look below, you can see that the writing quality is excellent up until that point. After that though, the jitter jumps up considerably. As you can see, this also has a negative effect on the PI/PIF rates.

This disc was burned with HyperTuning off so that's not the cause here. The only thing I can think of is that Lite-On is using some sort of optimization to improve the writing quality. Thoughts?

And no, the results aren't this bad with all media. This was just an extreme example of what I'm seeing.
Attachments
Lite-On SHM-165H6S Write Quality Verbatim 16x DVD+R.jpeg
Lite-On SHM-165H6S Write Quality Verbatim 16x DVD+R.jpeg (85.11 KiB) Viewed 538 times
Lite-On SHM-165H6S CD Speed DVD+R Write.jpg
Lite-On SHM-165H6S CD Speed DVD+R Write.jpg (53.43 KiB) Viewed 539 times
"Blu-ray is just a bag of hurt." - Steve Jobs
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Postby MediumRare on Mon Apr 10, 2006 4:36 pm

That's not very pretty. :o

What does the transfer rate look like on the BenQ? Do you have a Plextor available for an alternate jitter test?

G
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Postby Ian on Mon Apr 10, 2006 5:25 pm

In most cases, the transfer rate is still smooth. Yeah, I can dust off my Plextor. It's not as sensitive as the BenQ though when it comes to Jitter.
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Postby [buck] on Mon Apr 10, 2006 5:27 pm

It seems like that single recalibration point is a problem with alot of media! I just don't understand how LiteON could screw a single recalibration point up so badly... in the case the scan goes from "good" to "terrible".
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Postby dolphinius_rex on Mon Apr 10, 2006 6:26 pm

Ian wrote:In most cases, the transfer rate is still smooth. Yeah, I can dust off my Plextor. It's not as sensitive as the BenQ though when it comes to Jitter.


Yeah, I've never found Plextor to be a reliable jitter tester in any situation.
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