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What is considered good enough in tests? - 3/18/2003 9:15:39 AM   
SuperG

 

Posts: 7
Joined: 3/18/2003
From: USA
Status: offline
Hi ALL,

I am a little new to the testing of CDRs. So if anyone could tell me using Nero CD Speed, what results are considered very good, good, OK, bad, and very bad. And also, if I can use this CD Doctor program I hear so much about. I am not sure it is compatible with my drive. Well lets start with an example and then someone can give me their opinion. I have a 74MIN 650MB TDK, burned over 2 years ago, and stored in good condition, with no visible marks/discoloration on it. The actuall written length is 71mins, and 627MB, and its a DATA CD. With ATIP: 97m 24s 01f
Manufacturer: Taiyo Yuden Company Ltd. Recording Layer: Cyanine Material.
And I know that Taiyo Yuden is suppose to be among the BEST for quality CDRs.

I decided to pop this into both my CDR/RW dirve, which is a Ricoh 7200A, and my regular 50x MAX CD-ROM, of which I do not know the brand, nero cd speed just says "E-IDE CD-ROM 50X L V15".

First, for my CD-ROM, using CD Quality Check on Nero CD Speed, and it reported, 458,640 Errors (with 3 red spikes through the majority of the disc, and as many a 6 red spikes directly at the end of the disc (maybe because the CDR is not finalized???)). Then with my CD-ROM and Nero CD Speed ScanDisc, running both the filetest and the surface scan. For the File Test, it gave the result, files checked: 21 / Errors: 0. As for the surface scan, I got the result: 98.83% Good, 0% Damaged, and 1.17% Unreadable.
Next, for my CDR/RW drive, using CD Quality Check on Nero CD Speed, and it reported, 0 ERRORS!!! (no spikes). Then with my CDR/RW and Nero CD Speed ScanDisc, running both the filetest and the surface scan. For the File Test, it gave the result, files checked: 21 / Errors: 0. As for the surface scan, I got the result: 100.00% Good, 0% Damaged, and 0% Unreadable.
I am a little confused as to how my burner returned NO ERRORS AT ALL, but my regular CDROM reported 400000+ errors, and the unreadable sectors.

Now after seeing all this, I am guessing since the burner read it perfectly, the CDR is fine, but why the difference between my CDROM and CDR/RW. And does that mean anything for the longevity of my media? Also, assuming I am using my CDR/RW for my tests, what is considered acceptable for my other media? Is less than 100,000 errors good enough? less than 50,000?, or does it have to be 0 errors? And how does the surface scan need to be, generally, ?% Good, ?% Damaged, and ?% Unreadable. I have a lot of important stuff already stored on CDRs, and back then, I did not know much about quality of CDRs, I just picked up what I could find. So therefore, I would like to test my CDRs, and move the data onto different CDRs, if there is a problem with them, before they die out completely. Also, are all of these tests required before you can make a judgement on that CDR, or is it OK if the first test has no errors, can you determine that it is OK? For example, if I run the CD Quality test first, and I get a result of 0 ERRORS, then is there still a need to run the file test and surface scan? And in the same way, what if I ran only the Surface Test first, and it gave me 100% Good, do I still need to run the file test and the CD Quality Test? And should I use my burner or my actual CD-ROM to do these test? Thank You.

SuperG

P.S. Also, please let me know if I can use CD Doctor with my CDR/RW or my CDROM. Thanks.
Post #: 1
RE: What is considered good enough in tests? - 3/18/2003 4:27:40 PM   
Lev

 

Posts: 26
Joined: 2/26/2003
From: United Kingdom
Status: offline
This website http://digitaldolphin.netfirms.com should tell you all you need to know about "What is acceptable" in terms of C1 / C2 error reports....

Ok, it doesnt so much tell you, it gives you a guide as to what you ^can^ get


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Post #: 2
RE: What is considered good enough in tests? - 3/19/2003 12:20:04 AM   
Dolphinius_Rex


Posts: 3310
Joined: 9/14/2002
From: Vancouver, B.C. Canada
Status: offline
The best way to find out if CD Doctor works with your CD Writer is to try using it. If it works, then your drive is compatible, if it doesn't then it isn't.

With regards to your testing, it is important to realize that not all drives are born equal for error reporting. Most of the time, regular CD-ROMs can't do it at all. Some CD Burners can't do it at all, or very well. Most are okay, and some are VERY good. LiteON drives are considered to be very accurate, which is why I use one for all of my testing. I would not recommend using your (or any other) CD-ROM for doing CD-R testing.

With regards to what is ok for a CD-R: Nero CD Speed can only read C2 errors, and there should not be any C2 errors on a CD-R, at least in *my* opinion. C2 errors will not automatically mean there will be unreadable parts, but they do make it much more likely!

If your CD-R has an unreadable sector/block, it is BAD, regardless of anything else. Use Nero CD Speed's Scan Disc to check for unreadable blocks, it's very good at testing for these, and that is the main reason I continue to use it in my testing, as neither CD Doctor, nor the CD Quality test will give you that information directly.

The CD Quality test (in Nero CD Speed) is good to use if you can't run CD Doctor, it gives you a better idea of the overall quality of your disc, but it has it's limitations since it is only reporting C2 errors, and not C1 as well. You don't really need to run both the CD quality check AND CD Doctor if both are available to you, since CD Doctor is much more accurate in most cases. I use both on my website, but only because I want to show people what to expect from the software they have open to them, since not everyone can use CD Doctor.

I hope you find this info useful good luck on your testing!


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Post #: 3
RE: What is considered good enough in tests? - 3/19/2003 7:34:27 AM   
SuperG

 

Posts: 7
Joined: 3/18/2003
From: USA
Status: offline
Dolphinius_Rex,

Thanks very much for your reply. Well, I have checked around, and I now know that my burner (Ricoh 7200A CDR/RW) will NOT work with CD Doctor :( Therefore, I guess I am going to have to stick with Nero CD-Speed ONLY. I do like Nero CD-Speed a lot, and I just want to know if you have heard anything about my Ricoh 7200A, in the regards of how good it is at reporting C2 errors. Actually, I am not 100% sure it does. The only thing I have seen that indicates my burner does support C2 is from Feurio, in its info. it had a box that said "Reports C2-errors" and for my Ricoh 7200A, it WAS CHECKED. So I guess that means it does support C2 error reporting? Also, is there ANY way I can find out if my CD-ROM supports C2 Error Reporting or not, because Feurio won't tell me that about my CDROM. Thanks.

SuperG

(in reply to SuperG)
Post #: 4
RE: What is considered good enough in tests? - 3/19/2003 8:30:37 AM   
Dolphinius_Rex


Posts: 3310
Joined: 9/14/2002
From: Vancouver, B.C. Canada
Status: offline
unfortunatly, I do not know how well the Ricoh 7200A reports C2 errors, sorry. Perhaps another member of this forum can help you.

I don't know of ANY CD-ROMs that can report C2 errors, so I would be VERY surprised if yours could. I believe the Nero Info Tool located in the Nero Tool Kit will tell you if your drive can return the information or not.


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Post #: 5
RE: What is considered good enough in tests? - 3/19/2003 6:40:19 PM   
rjw

 

Posts: 932
Joined: 8/18/2001
From: Netherlands
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there are some tools for this at the site of the EAC people and doesn't the new versions of cd speed has such an option 2. To check the C2 error recognition quality.

(in reply to SuperG)
Post #: 6
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