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Any visual system for measuring extent of scratches to DVD? |
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| Registered: May 30, 2008 | | Posts: 445 |
| | Posted: | | | | There's lots of scanning software out there for guesstimating the number of errors on a recordable disc, but I've never really known how to quantify how readable a given glass-mastered disc might be.
Has anyone taken a stab at this in any pseudo-scientific way?
Given that drives can report on regions of the disc that can / can't be read, it seems reasonable that someone might have tried to tie this to a graphical representation of readability -- a visual map of the disc showing significant scuffs and scratches.
Anything out there like this? |
| | Registered: May 19, 2007 | Reputation:  |  Posts: 6,730 |
| | Posted: | | | | I'm not sure if anything like this is possible.
There can be no near accurate estimation about when a disk is still playable. Simply because one small scratch in the "lead-in" suffices to make a coaster out of a DVD. Whereas on the other hand the DVD might be totally covered with scratches and is still playing fine.
It mostly depends on the error-correction capabilities of your player. | | | It all seems so stupid, it makes me want to give up!
But why should I give up, when it all seems so stupid?
Registrant since 05/22/2003 |
| | Registered: March 14, 2007 | | Posts: 3,830 |
| | Posted: | | | | I don't know if this will be what you are looking for: dvdisaster free Software under the GNU General Public License v2What the ssoftware does is records an error correction on another disc! You make this disc before your disc has read errors! it has a scan function, so you scan it now, and scan it after you get the dvd back from loaning. Then you would be able to tell if there was additional damage on the dvd in that period. Quote:
Common misunderstandings about dvdisaster:
dvdisaster can not make defective media readable again. Contents of a defective medium can not be recovered without the error correction data.
Such functions are outside the scope of dvdisaster's internal design and goals. Quote:
dvdisaster as a complement to quality scans
Quality scans, e.g. C2 error or PI/PO scans are a valuable tool for testing the results of the media writing process.
But quality scans are not a reliable means of predicting the lifetime of optical media.
Consider we are looking for the right time to copy a worn-out medium onto a new one:
Too early: Copying media because of a bad quality scan is cost-ineffective. Sometimes such media remain readable much longer than expected.
Too late: When the quality scan reveals unreadable sectors some data has already been lost.
Right before the medium fails: The ideal case, but how to tell?
However, we could do it the dvdisaster way:
Create error correction data for the medium.
Scan the medium regularly. Use it until the first read errors occur.
Recover the read errors using the error correction data. Write the recovered image to a new medium. If you have unique DVD's, hard to get at: | | | | Sources for one or more of the changes and/or additions were not submitted. Please include the sources for your changes in the contribution notes, especially for cast and crew additions. | | | | Last edited: by ? |
| | Registered: March 13, 2007 | Reputation:  |  Posts: 3,321 |
| | Posted: | | | | The best visual system I've found for measuring scratches on my disc are my eyes. | | | Get the CSVExport and Database Query plug-ins here.
Create fake parent profiles to organize your collection. |
| | Registered: March 13, 2007 | Reputation:  |  Posts: 5,491 |
| | Posted: | | | | and don't forget ,, scratches from the inner most circle is the beginning of the disc.. scratches on the outer edge is the end of the disc information... ( in case you are looking for visual evidence) .. | | | In the 60's, People took Acid to make the world Weird. Now the World is weird and People take Prozac to make it Normal.
Terry | | | | Last edited: by widescreenforever |
| | Registered: June 21, 2007 | | Reputation: | | Posts: 2,621 |
| | Posted: | | | | Quoting Mark Harrison: Quote:
The best visual system I've found for measuring scratches on my disc are my eyes. This is usually the case with me too, until recently a few dvd-r's that look perfect have skipped and frozen in my player. Think it's due to the player getting old, the computer reads/plays them just fine. Goblins has a great point as well, just a little nick on the right spot and the disc is useless, while other discs look like they've been cleaned with sandpaper, repeatedly, yet play perfect. The software Gigi mentions sounds kinda interesting if it works (didn't click any links, just read what's here), but I don't lend my discs out so I'd have little use for it. Guess I could see if playing anything results in minor damage. Great thread ya'll, a round of arrows for the lot of ya.  |
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