DVD error testing software

[aftertaste]

I am having a problem with say 1 out of every 20 dvd-r (ritek G3) that I burn (Pioneer A05 @ 1x). Towards the end of the movie (disc) I get blocks and sometimes it will pause for a moment (sometimes start back up or in some cases freeze completely). I am blaming this on the media which i understand sometimes causes errors like these. My first question is - does anyone have any info they would like to shead on this topic and second is there good software that will test for any and all errors that may have introduced themselves during the burning process. I'm not looking for img to img testing for most of these movies were re encoded and I do not have an original img to compare with. I am patient in this new world of dvd burning but i need to make sure the img I create is non corrupt (without watching the whole movie) before I delete the files off my HD. On a weird note, for example I did the movie "everafter" and it encoded without any errors and burned with the latest version of ImgTools without any reported errors. When I play it on my standalone it freezes towards the end of the disc so I tried it in 2 other dvd rom drives and it freezes at the same spot (however my standalone seems to be more tender and shows blocks in points around where it freezes that the 2 rom drives don't). Now I didn't want to trash the movie so I tried using dvd decrypter to rip it and re burn. The 2 rom drives that it froze in while playing also locked at the same point during the ripping process. HOWEVER when playing and ripping that very same disc in my Pioneer A05 (the drive used to burn it in the first place) I encountered 0 errors and perfect playback. I find this very confusing and could understand if this were happening with every disc I burn. The truth is 95% of dvds I have burnt have played back without a glitch on my standalone which would be the one player I have to show any possible errors. Sorry this post is a bit long but i'm really trying to make sense of this all. THX

[mb1]

Have a look at this article
http://www.cdrinfo.com/Sections/Articles/Specific.asp?ArticleHeadline=Testing%20media%20quality&Series=0

Written for CD-R but most of the tested soft could be used for DVD too.

First part of media testing could be Nero CD-Speed (which works for DVD too). There use the extra - scandisk function.

Links to the software used can be found in the article. Some of them are freeware, too.

[aftertaste]

ok did a few more tests. Thought i would share the results. I d/l'd a program called Nero DVD Speed. Not sure if this is the best software for testing errors but the results of the bad disc (everafter) were not suprising. I ran the test on my lite on which was giving me the same errors (minus the blocking i got from my standalone). Towards the end of the disc where i got blocks on my standalone i got dips on the graph and where it locked up on 2 dvd roms and the standalone i got a read error in Nero DVD Speed. The line on the graph bottomed out and the program stopped with a read error. Like i was saying before the weird thing is i was able to rip the movie with dvd decrypter without any errors using the pioneer A05 (used to originaly burn this disc). Then i re authored and re burnt the movie using the same exast process i did in the first place. The new disc plays back perfect on all three of my dvd roms and my standalone. However when running Nero DVD Speed i still get drops on the line towards the end of the disc. don't see any errors on playback though. So i'm still a bit confused about this all but i did seem to find a way to fix the few movies that had messed up during the burning process.

[malum]

The writer will pretty much always be able to read the discs. Your standalone will be more fussy. One of my standalones plays pretty much anything even the cheapest crap without a problem, the other falls over at the first sign of a bad burn.
As you discovered you can just rip the movie off the offending disc and reburn it.

I'm surprised that you have problems with the riteks, by all accounts they are very good, maybe your standalone is particularly fussy

[mb1]

Video-Playback always is 1x speed

Reading test work with maximum possible speeds. So it does not wonder when speed drops down at the end but plays back perfectly in this parts.

Problem is: why is it dropping down ?
Mostly because cheap media looses quality towards the end.

Another problem: errors are growing with media age.

So if you have problems right after burning your disc try to read it some weeks (or maybe 3 or 4 months) later und your data is unreadable.

The writers readability depends also on its error handling.
Bad example: Sony DRU500A