Cyclic Redundancy Error ?

[ScottFern]

I just installed my Raptor drive and thought it would be a good idea to format my "Data drive". So, I backed up my mp3s and thought, I should burn them onto 2 dvd-r discs.

Now, when I go to copy them back over, I get this CRC error. I know its corrupted data, but Nero said the burn process was completed "successfully", isn't this the keyword here?

Ok ok, I did burn my ridata G04 media at 8X, when its rated at 4X, but all my dvds I burned at 8X play just fine in my dvd player, no corruption there? Where exactly does the problem lie? Is it me

 

[CrackRabbit]

Ive gotten CRC errors in items burned on cheap media. Just learened to stay away from the cheaper stuff.

 

[Mark R]

Did you verify the disc after burning? Nero has an option to do this - essentially, it reads the disc and checks it against the data on your HD. If they don't match, then you get a warning, and can burn again.

Just because the burn was successful does not mean that the data was readable - all it means was that the burner got to the end of the disc without losing focus or tracking, and not that the dye was correctly burned (it's not possible to read the data back as it is being recorded). DVD-video is not a good test; one of the design features of MPEG2 is that should be capable of handling minor data errors with minimal artefacts - you often won't see errors unless they are severe.

Remember, next time, to use high quality media (none of this low grade Ritek stuff, or even worse, someone that OEMs ritek stuff) and burn it at its rated speed. If you are really paranoid, use an archive program like WinRAR which can add parity to an archive, allowing recovery even in the event of disc errors.

 

[ScottFern]

thanks for the tips!

What is considered "high qualtiy" DVD-R discs ????

 

[DaveSimmons]

all my dvds I burned at 8X play just fine in my dvd player, no corruption there?

or not enough to be very noticeable -- one bad pixel doesn't stop you from watching, but one bad byte can trash a data file.

Try the Nero verify, and you might want to be more patient and burn at 4X until you have real 8X media. Ritek is good media at its rated speed.

 

[VirtualLarry]

If you're serious about recoverability of data, break your archives into chunks with RAR or ZIP, and then use SmartPAR to generate parity archive files, and then burn a mix of those to several discs. If one of the archive chunks is unreadable or bad, the parity archive chunk can be used to re-generate it back. It's like RAID-5 for files.

 

[tynopik]

or better yet, use a par2 program (like QuickPar) so you don't have to chunk your data

 

[Cerb]

Quickpar is awesome.

Anyway, Mitsubishi is good if you can find it, but an easy to find media that is also excellent would be Taiyo Yuden. I haven't used any (heck, I still haven't used my free 5-pack of Riteks from Newegg ), but they look to be as good as the Mitsubishi discs--and I do have some old Verbatim Datalife Plus CD-Rs (Verbatim and Verbatim Datalife may not be Mitsubishi; and for DVD-Rs, even Plus may not be! ugh!) that have been burned from cigarettes, faded rom the sun, and scratched badly on the read side, that still read fine. If the TY DVD discs are half that good, they are worth the typical higher price when it comes to backups.
I'm trusting my CDs to only genuine MCCs, and will probably use TYs once I get to backing up DVDs.

Riteks really aren't bad, they just aren't all that good, either. If you may need data months or years from the backup, use nothing but the good stuff--I have been bitten by dead CDRs before, dying months after burning. Don't expect DVD media to be any different.

...but if you really need backups, external hard drives are hard to beat.

 

[BuckNaked]

Mark R

Remember, next time, to use high quality media (none of this low grade Ritek stuff, or even worse, someone that OEMs ritek stuff) and burn it at its rated speed. If you are really paranoid, use an archive program like WinRAR which can add parity to an archive, allowing recovery even in the event of disc errors.

I was under the impression that although Riteks were poor quality CD-R's, they were top of the line for DVD-R's... whats the deal? do you have a comparison that says otherwise..? or are you just taking bad experience with one media and assuming all of there media is bad...?

 

[NightCrawler]

Originally posted by: ScottFern
I just installed my Raptor drive and thought it would be a good idea to format my "Data drive". So, I backed up my mp3s and thought, I should burn them onto 2 dvd-r discs.

Now, when I go to copy them back over, I get this CRC error. I know its corrupted data, but Nero said the burn process was completed "successfully", isn't this the keyword here?

Ok ok, I did burn my ridata G04 media at 8X, when its rated at 4X, but all my dvds I burned at 8X play just fine in my dvd player, no corruption there? Where exactly does the problem lie? Is it me

Important Data should be written at slower speeds. The fact that you burned 8x on 4x media does not help. Nero should gave verify the data, check that box if it isn't.

You could also use DVD+RW because then you can easily burn two copies and when you begin to run out of disc you can back erase some of the older copies when the old data isn't that important anywmore.

 

[Cerb]

Also, rereading the OP:

but all my dvds I burned at 8X play just fine in my dvd player

That does not mean there were no errors. In fact, a DVD with no read errors is practically impossible to find. That they play just means it was able to either correct the data it couldn't read (there are three levels of ECC, IIRC), or figure out close enough values that you don't notice it during playback. The last part is what nice CD/DVD players should do, and what simply does NOT fly with data. Also, many set-top players are more lenient about corruption than many PC drives, and the media itself matters in both situations (your player might like the G04s more than your burner).

Except for being near coaster-proof nowadays, this stuff is as much a black art as ever.

If it works, check out KProbe. Made for Liteon drives only, but often works with others no sweat.