Ask Your Writing Quality Test Questions Here

[dodecahedron]

I noticed that the attachments here aren't visible unless you're logged on. This is the only forum where this is the case.

???
this is exactly how it is @ cdfreaks - attachments only visible when logged on!

[dodecahedron]

question of protocol:

are all questions/discussions about media testing to be posted/asked in this topic only?
isn't it a bit too much for just one thread?

[dodecahedron]

what speed media tests should be posted ?

example:
i have a couple of TY spindles, apparently not that great. rated 8x, i usually burn at 4x to get better writing quality out of it. it can also (sometimes) burn at 12x.
what speed should i post? only the fasted the drive will do ? only the rated speed ? all of the speeds at which i tested ?

[[buck]]

what speed media tests should be posted ?

example:
i have a couple of TY spindles, apparently not that great. rated 8x, i usually burn at 4x to get better writing quality out of it. it can also (sometimes) burn at 12x.
what speed should i post? only the fasted the drive will do ? only the rated speed ? all of the speeds at which i tested ?

Whichever you want to show us There's no formal rules for this...

[Ian]

I noticed that the attachments here aren't visible unless you're logged on. This is the only forum where this is the case.

???
this is exactly how it is @ cdfreaks - attachments only visible when logged on!

I thought I fixed this. Attachments should be visible to everyone, logged in or not.

[bill]

I thought I fixed this. Attachments should be visible to everyone, logged in or not.

Has worked fine on this end, logged in or out, doesn't matter.

[dodecahedron]

I thought I fixed this. Attachments should be visible to everyone, logged in or not.

sorry about that, i just reread MediumRare's post and responded to the comment that this is the ONLY forum etc.. it's that way at cdfreaks all the time. not logged in = no pics.

OK then i'll post the scans of the media for all speeds at which i scan.
e.g. YUDEN000T02 @ 4x, 8x, 12x ...
just that i thought that it might "burnden" the forum with many posts, and maybe most people aren't interested in anything less than the fastest, or less than the rated speed, so maybe i shouldn't post those.

[dolphinius_rex]

just that i thought that it might "burnden" the forum with many posts, and maybe most people aren't interested in anything less than the fastest, or less than the rated speed, so maybe i shouldn't post those.

Nah, post them all. Some people want to know how discs perform at various speeds. It's all educational right?

[dodecahedron]

i already posted this here and got no response. maybe will get more here.

when i take a disc out of the drive, either having just burned it or even having read it, it is warm to the touch.
damn, i put a DVD i just burned in the drive just before this post and forgot it there for 5 minutes, it gets warm from just sitting in the drive!

question:
how does the disc temperature affect the quality scans? anyone test this out ?

do you do a media scan right after having burned the disc or do you wait a little for the disc to cool off ? possibly also for the drive to cool off ?

also, do you let the burner drive cool off after one burn before burning the next disc ? if so how long ?

c'mon, we have some serious media testers here...discussion!

[dolphinius_rex]

For myself, I make sure I use a case built for extreme cooling. My drives DO heat up, but during the hotter days I make sure to give them lot's of down time.

I've noticed that error rates can scan higher when the drive is too hot in the past, so if you are burning and scanning in the same drive, and you feel the heat is getting excessive, it might not be a bad idea to let it cool down a bit. I have a feeling it gets much hotter in your neck of the woods then in mine

[MediumRare]

I thought I fixed this. Attachments should be visible to everyone, logged in or not.

sorry about that, i just reread MediumRare's post and responded to the comment that this is the ONLY forum etc.. it's that way at cdfreaks all the time. not logged in = no pics.

Ian fixed that a long time ago. I used forum to mean an entry as shown in the "forums" tab here, e.g. "DVD Writers", "The Beer Garden". CDFreaks would be another board.

This is a bit O.T., but I think it's better the way it's done here- avoids having people sign up just to see the information. It's handled like that at Doom9 too (both the English and German boards).

G

[MediumRare]

i already posted this here and got no response. maybe will get more here.

Frankly, I think this topic deserves it's own thread.

I do about 10x as much scanning as burning, so I don't have too many thermal problems at present. I have seen variations of up to a factor of 5 in PIE with repeated scans- that may have been a thermal problem. Can't say anymore.

I always scan a disc with KProbe immediately after burning it. If I'm not in a great hurry, this means:
- KProbe at 2 speeds,
- transfer rate (TRT) and often quality test with CD-Speed
- and lately beta and jitter with DVDScan.

I hope to finally add some long-promised LiteOn scans to this forum when I get a bit sorted out- maybe next week.

G

[dodecahedron]

Frankly, I think this topic deserves it's own thread.

i think so too, but that topic got no response.
moreover it would make sense for the discussion to be here, in this forum. maybe it's possible to construct some mechanism where there are thread the discuss media testing in this forum, in the DVD Writers forum they would get lost. make create subforums - one for discussing media testing, the other for the actual scans ?

I do about 10x as much scanning as burning, so I don't have too many thermal problems at present

scanning causes heat too. feel a disc after you've scanned it!

[[buck]]

I haven't really looked into how heat affects scans to be honest. I'll see if I can do a few tests when I get home.

[Ian]

moreover it would make sense for the discussion to be here, in this forum. maybe it's possible to construct some mechanism where there are thread the discuss media testing in this forum, in the DVD Writers forum they would get lost. make create subforums - one for discussing media testing, the other for the actual scans ?

I've been meaning to make an entire section for writing quality (maybe media in general?). Part of this would include a section for general writing quality discussion. Thoughts?

[[buck]]

Alrighty, I run a couple tests. Here's what I did:

1. Scanned an Verbatim MCC004 disc in a DW1640 that has been idle all day
2. Ran 3 consecutive transfer rate tests on that disc to heat up the drive
3. Immediately scanned that same disc again

(see attachments)

As you can see in the second scan, PIE total is up ~35%, jitter is up ~0.5%, and PIF total is up just marginally. Based on this test, I would say this particular drive *is* affected by temperature, just not a whole lot.

[Ian]

Please ask your questions in the General Media Discussion section of the forum.