Hope everyone appreciates this - I'm about to waste about $50 worth of blank DVD-R media in the name of science. I've come up with (I think) a pretty decent way of checking media quality... Results in a few days (gonna take a while to burn my test image onto all of these blanks). Burns are done with a Pioneer A03 with hacked 2X - 1.68 firmware. All DVD-R blanks are blown off with a compressed air can to remove any particles prior to burning. Cleanliness rating is based on the surface after it has been blown off. Currently testing is performed with a Pioneer RP56 set-top player. I'll be adding stats from another player shortly as a double-check. Nogami :)
--------------------- Łapa! Mam na imię Adrian. Jestem tutaj totalnym żółtodziobem, nie mniej mam w zamyśle stale uczestniczyć, w życiu tego serwisu. W trzech zdaniach, wypada napomknąć, że na co dzień pomieszkuję w Legnicy, fascynuje mnie kosmos, uwielbiam siatkówkę, oraz jak jakikolwiek człowiek luksusowe fury;)
Sounds pretty cool. But why don't you do the same tests burning x1 1st ?? If the DVD-R you're testing gives error at x1, there is no way it burns fine in x2... Could it be because that would be taking too long ? (1h instead of 27mns ?)
So none of the media you're testing were rated at 2X? you trying to find cheap 1x media that will work at 2x? it really doesn't seem worth the effort to do that.
Because I have 2 samples of each type of DVD blank, I'm actually going to do test burns at both speeds. Figured the 2x ones would be more interesting as to the quality of the blank itself as it will push the media more - areas that might burn fine at 1x may error out at 2x and show areas of bad media more easily. My testing methodology is this: I'm burning a full DVD of SMPTE color bars encoded at 8.5Mbps CBR with 192kbps AC3 audio consisting of 1khz audio tone. I'm putting the disk in my set-top player and playing it back while simultaneously recording the audio channel out of my set-top player back into a .wav file. I then go back through the .wav file and analyze it for any breaks in the 1khz tone. When breaks are found, I log the position on the disk into my spreadsheet (which will eventually be made into pretty graphs for my webpage). While some soft-errors (video breakup only) will slip through, hard errors consisting of both audio and video breakups are easy to detect and count with this method. I'm going to do a 2nd test of each disk later using an even more finicky set-top player which should be even more critical of media errors. I considered burning DVD-R ISOs consisting of files in the 250mb range to see where errors appeared, however testing on the set-top player (with more finicky laser pickup) can show errors that DVD-ROM drives may still read properly. N.
Good idea about blowing the dust off, I've found it to be crucial when burning. I've seen dark pathces in the recording dye as a result of burning a disc that had dust on it. However, the disk verified OK. While your test will determine media quality/compatibility with your settop player, someone with a different settop will likely get different results. Seems like it would be fair to point this out explicitly in your test results for beggining members. For example, I can put the same DVD-R in two different settop players that I own and it will play perfectly in one and have dropouts on the other. There is just too much variability in settop players right now (with respect to DVD-R media) to make a definitive statement on media quality. I think it's great that your doing the test and sharing it with everyone so please don't take my comments as any kind of criticism. I just wanted to point out a subtle but important issue.
--------------------- W trzech słowach, należałoby napomknąć, że na co dzień mieszkam w Katowicach, fascynuje mnie fotografia, kocham piłkę nożną, oraz jak przyzwoity człowiek szykowne samochody;)
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RE: Wasting DVD-R media in the name of SCIENCE! :)
