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I have just burnt a backup of a Video DVD on a DVD+R DL. After burning I made a few big scratches on the disc, because I dont have very much experience w/ Dual Layer disks.

I still can play the DVD, but I don't think that I can searcht the whole movie to check if the DVD is still good.

So I made a scan w/ kprobe 2.5.2, which can be seen in the attachement.

The scatch seemed only to influence the first layer, which I believe ist the one which ist closer to the surface of the disc. But the program found 5 errors in a small section at about 30% of the first layer and also in this section the PIF is about as high as the PI at 93.

I think, that the bad overall results on the second layer are normal, because they are not influenced by the positions of the scratches.



Edit: I now also made a speedtest, because in a different forum they someone said I should do this, but on a different drive, because it doesn't work w/ this drive and my Nero version.

The result looks like the ones I founr w/ google four duoble layer disks, except the small kink in the middle.

But maybe this is because it is a slimline notebook drive, which has only a max. read speed of 6x for DVD+R DL. I haven't found any results fpor drives of this kind.

Also I don' think that the kink comes from a scratch, because I don't have the big scratches so far on the outside.

Please rescan that disc with KProbe @4x speed (not max). The reading behaviour of drives can depend strongly on the speed used and for older LiteOn drives, scanning faster than 4x is not very useful.

Don't worry too much about the isolated PIF spike- that could be a glitch.

The TRT test on the notebook looks good, though. The "kink" is the layer break.

Another tip: save you images as PNG files- they're smaller and better suited for these types of diagrams than jpeg's are. CD-Speed normally has a floppy symbol in the title bar that accesses the save dialog. This is missing on your screen shot (Vista problem?).

G

MediumRare wrote:Another tip: save you images as PNG files- they're smaller and better suited for these types of diagrams than jpeg's are. CD-Speed normally has a floppy symbol in the title bar that accesses the save dialog. This is missing on your screen shot (Vista problem?).

G

I can access the dialog over the menu, but I found it better to do a screenshot.

Abot the kink: I haven't seen this in other scrennshots of DL media or it was at least much smaller like in this screenshot: http://www.fcenter.ru/img/article/CD_DV ... /97842.png

But maybe this is just because lthe laptop drive slower in every aspect. Even the access time is very high.


Edit: I made a new test w/ kprobe at 4x, because somone in a different Forrum said I shopuld do this an the spike is

really gone now, althought the average results are even worse then before.

Disc is way, way, way out of spec (really bad), if there's nothing wrong with the process made to use the graphs. Pretty surprising the TRT looks so smooth.

In a sense, the fact that it's readable, with those results, make me think something's wrong with the scan...

I finally had the time to buy my new dual layer burner for my desktop system (Samsung SH-203B, but in the BIOS, in Kprobe and in any bruning software it is called TSSTcorp CDDVDW SH-203B, so I think it's an OEM product).

I made a backup copy of a different DVD-Video. I first tested this copy w/ windiff (I first made an Image w/ CloneCD, than I burnt the DVD from this image and after this I mounted the Image as virtual Disk and compared the files w/ windiff). The result was, taht all files except one were identical. This one file was a .vob file, which was not very important, because it only contained the animations of the menus. Also I used my DVD-ROM-drive for windiff, because I want my DVd to work in any drive.

Because of this result in windiff I was worried about the quality of the disc and ran Kprobe2 (I ran it on the bruner, because on my old DVD-ROM-Drive Kprobe doesn't work w/ ±R-DL media). First I ran it at 16x, but because some of the PIF values ware over the official maximum of 4, I ran it again at 2x, but the 2x results were only much better in PI, there was only a small diffrence in PIF. I can't run Kprobe at 2x w/ my burner.

I now want to know, it my results are O.K., althought some PIF scores are over 4. But what is for sure is that they are much better than w/ the notebook drive.

Also this DVD can be played w/o any problems, but this is also true for the othe one.

Also I want to add, that Kprobe does not only work w/ LiteOn drives, but also w/ some other brands like Samsung, because they use the same chipset.

Justin42 wrote:Disc is way, way, way out of spec (really bad), if there's nothing wrong with the process made to use the graphs. Pretty surprising the TRT looks so smooth.

In a sense, the fact that it's readable, with those results, make me think something's wrong with the scan...

I made scans w/ this disk again, this time w/ my new drive.

The results are a little better than w/ the old burner, but the PI scores are still far beyond the official maximum, but there ist not such a big difference between the first and the second layer anymore.

If there is something wrong w/ the first scans it is maybe because my old desktop burner (which was used for the first tests) is from a time where there were no DL burneres/media available.


Edit: I now also made a speedtest w/ the first disc and the new desktop drive. Compared to the notebook dirve I have 3 smaller kinks instead of one. The kink in the middle should be normal for +R-DL from the images I have found in google.


Edit2: I just read in a forum thread, that a possible reason for the still too high PIE values was that I burnt this disk before I activated DMA, because DMA didn't work w/ my old SATA driver, it works now after a driver update. But I only burnt at 2.4x, because I had already seen, that the max. speed was about 3x in Nero CD DVD Speed.

What do you think about this?

Now I have a result w/ DMA on the new desktop burner.

The test was made at 16x, but if the result is not good I will make another one at 2x.

From what I read there should only be small spikes over 4 for PIF, but does this still count as small spikes?

Edit: I now also did the test of the last did w/ 2x, but the result is nearly the same. Only the PI values are about 20% lower.

Edit2: I have a question about the disc, which was the one for which I originally started this thread. When I try play it in my DVD-ROM-drive I asometimes get a CRC Error, but wenn I don't get one, it plays just fine. It also plays fine in my standalone DVD-Player.