CRC error

[xiaobao12]

Is it possible that even though you get the "DVD burned successfully" message, the burn could have been bad? The reason why I'm asking is because I'm getting CRC errors with my ridata DVDs (ricojpn).

Any help would be appreciated. Thanks.

 

[vshah]

pretty much, the answer is yes. some drives may read it, others may not...depends on their tolerance of burn errors.

 

[xiaobao12]

ok - here's an update. i just put in some of my older burns and scanned them with nero cd-dvd speed (surface scan) and i'm getting a bunch of red blocks towards the end for all of them! i'm burning them with a NEC 1100A on the lowest setting on ridata 4xs. is something wrong with my burner?

 

[V00D00]

It Could be the burner, but it's most likely the disks.

It's not necessarily that you have bad disks, but some disks don't work well in some burners.

No matter what when you burn a dvd there are errors. There are usually so few of them that you don't notice. When the drives do go bad, then you will usually get more and more errors until your disks are completely unreadable.

So try some different brand of disks, if that still gives you bad results, then I would plan on getting a new drive.

 

[xiaobao12]

thanks voodoo.

i just put in a factory pressed dvd (not burned) and i scanned it with nero cd-dvd speed but its still coming up with errors. i thought all manufactured dvd's are perfectly burned?

 

[Cerb]

Originally posted by: xiaobao12
thanks voodoo.

i just put in a factory pressed dvd (not burned) and i scanned it with nero cd-dvd speed but its still coming up with errors. i thought all manufactured dvd's are perfectly burned?

They are pressed, and no, they are not perfect. None are. They are within certaintolerances, but not perfect. They are designed with three levels of ECC (or is it two, but one level just CRCs? I don't recall, exactly), which are read with the data itself, so that minor errors can be corrected without re-reading the disc. If an error is too bad, it must reread until it gets it right (for data DVDs). If you get a CRC error, it cannot correct it. However, given the drive, it may be the drive as much as the media. Note that the same is true for CDs, but they are less resilient, concerning both the physical make, and the data itself.

 

[JimPhelpsMI]

Hi, CRC (Cyclic Redundancy Check) is a complicated mathematical calculation of the one bits in the bytes being transfered. It is capable of correcting some errors. The result of the calculation is written at the end of the file. When reading the file data, if the new calculation does not match the stored value then there has been an error. It could be a writing error or a reading error. Hope this helps, Jim

 

[xiaobao12]

hey all,

thanks for your replies. i am extremely upset by what i have learned and i want to trash my nec burner. could it be that i need to upgrade my firmware even though i'm getting "burn successful"? i HAVE tried to upgrade my firmware by following NEC's directions but it doens't work for me which annoys me highly.

 

[yourdeardaniel]

just upgrade to new nec 3520 for $37 shipped or 3540.

 

[xiaobao12]

hey daniel,

u got a linky for that? thanks.

 

[yourdeardaniel]

black nec 3540 oem $38.99 + $2 s/h http://www.newegg.com/Product/Product.asp?Item=N82E16827152047
beige benq 1640 oem $40.99 + free s/h http://www.newegg.com/Product/Product.asp?Item=N82E16827101649
pioneer dvr-110d $46.99 + $4.00 s/h http://www.newegg.com/Product/Product.asp?Item=N82E16827129165

can't find 3520 anymore, guess they're only selling 3540's now.

 

[xiaobao12]

thanks daniel. i will look up some info on here and elsewhere for head-to-head results but which one do you and most ATers prefer?