damaged CDs

[loco21]

hey guys, i have a question.

i burned a CD a long time ago, witch works fine. But when i go in CDspeed

half the cd says its damaged.

if the data on the cd is damaged. how come my cd-rom can still read it, without a problem. weird!!!

what does damaged mean exactly?

thank you!

[TheWizard]

Damaged means...well...damaged! The data is not unreadable, just damaged. If half the data is damaged, I suggest making a backup of the original copy soon; chances are the damaged CD won't last very long. Damaged discs will degrade quickly.

[Action Jackson]

Just for interests sake, any idea on the manufacturer of the "damaged" media?

[cfitz]

if the data on the cd is damaged. how come my cd-rom can still read it, without a problem. weird!!!

Damaged means that the sector had C2 errors on it. C2 errors are errors that can not be corrected with the lower-level error correcting codes on the CD. However, they are still fully correctable with the higher-level error correcting codes on the CD, so no errors propagate up to the OS and the application reading the file. That is why you can still read the disc without any problems in your CD-ROM. By the time the OS and application gets the data, it is completely error-free and un-corrupted.

cfitz

[loco21]

I did make a backup copy of the disc.

the CD media is Gigastorage!!

i made an image of that CD & burned it on a new CD!

& then i went to see if the backup copy was damaged. it was but less then the original one. only 1% damaged ( somewhere in the middle )

thanks guys!

[dodecahedron]

that's just a bad burn.

[Hitokiri]

i wouldn't trust cdspeed as it can only read E32 errors..and then still
you can have some E32 errors and it will show you that your cd is damaged, but when you have 100 times as much C1 and other C2 errors and no E32 errors..it will show you no problems

also it depends from drive to drive..reading it with a crappy drive will give you more errors than when reading it with a high quality drive..which one is right?

i used to check cd's with cdspeed, i don't do that anymore..i just make sure my drive and discs are of high quality, and after every burn i check with crc checksums

but in your case, i would say idd it was a bad burn

[cfitz]

Hi Hitokiri, glad to see you posting again!. And with a vengeance - five this morning already.

Ever since I started playing with WSES and CD Doctor I have been wondering more and more about CD Speed and exactly what it is doing and just how accurate/useful it truly is. You are obviously skeptical of CD Speed. What are your thoughts on WSES/CD Doctor? Do you have any more details on exactly what CD Speed is measuring, and how? Where did you get your information?

Thanks,

cfitz

[Hitokiri]

Hi Hitokiri, glad to see you posting again!. And with a vengeance - five this morning already.

thanks i'm having some troubles with my drive (as you know) so i came here to find some input from others, and thought i'd give some output along the way

Ever since I started playing with WSES and CD Doctor I have been wondering more and more about CD Speed and exactly what it is doing and just how accurate/useful it truly is. You are obviously skeptical of CD Speed. What are your thoughts on WSES/CD Doctor? Do you have any more details on exactly what CD Speed is measuring, and how? Where did you get your information?

Thanks,

cfitz

well, i am not that familiar with WSES and CD Doctor, since i am not able to utilise those programs
but as you can read in my post above..cd speed is not acurate at all, since it only shows you one type of error: E32, an uncorrectable..all other types of errors are neglected, since there is no way for the program to get access to such information from the drive (if the drive is capable to do so), unless it had the instruction sets of the drive in question..

if you want to scan for errors, just use a high quality drive and nero cd speed..if it finds E32 errors, the disc is useless (although it could be, by my own experience, that a disc would display an uncorrectable even if the disc is burnt properly..i had this serveral times when burning downloaded bin/cue's from games etc)
if the speed test and scandisc test show no problems, you have nothing to worry about imo..after all, every disc always will have errors on it..it's unavoidable

i came to know most of this from SatCP (look for his site), but unfortunately he does not reply to my mails any more..maybe he got tired of all my questions, i cannot blame him..they just kept coming