hello,
i have a DVD and i need to copy one file from it to my hard drive. that file takes 3,92GB. a few days ago i have found that only Win XP and a few other OS's can open DVDs with files larger than 2GB.
anyway, i dont even know if thats the problem.
so, when i copy the file, and something more than half is already copied, i get an error message: "Data Error: Cycling Redundancy Check..." (i am using Win XP). what could that mean? arent there any programs that could force computer to copy that file? IT IS NOT A VIDEO FILE, JUST DATA! (*.mdf file).
so, my first thought was that this file is exceeding 2GBs limit but then i thought again that Windows shouldnt have such problem. so now only one mind left in my half empty head () : the DVD is too much scratched and damaged. even my friend who gave me that cd, told that everything was OK when he last time copied it (quite long time ago).

so, dear community, any other suggestions about the problem and solution?

PS - let it be one more challenge

Im pretty unsure of your method here. I'm familiar with .mdf-files as beeing images of a dvd/cd. Try unpack with winIso or similar program and then copy over the files. Windows cannot open files larger than 2GB?... if you have a FATx partitionated drive it will most likely not associate with files >4GB.

Neway, good luck.

Your cd is probably damaged so much, that your dvd player is unable to retrieve the information correctly. I have no idea if programs exit that could help you recover the data. Basically, when I encounter such a problem with the disc, I give up.

basicly it means your screwed.

CRC error means that it can't read the data correctly from your disk.
windows detects you can't read certain bytes/sectors. and bloody hell stops completely with the file (why?).

Your file is big, and only one bit needs to be changed to fail the crc.

2 gig -> 8*2^31 bit
chance of error on disc >0

there is an inherent danger of using large files on dvd's.

so basicly i'm quite sure that some data on your disc is lost,
probably only a fraction of the 2gig .. so you can use some tricks

if it's an Iso or similar format, you can mount it, and copy the files from the mounted drive.
search for some program that doesn't give up on the entire file, ..

EDIT:
needless to say: try cleaning the disc first.

i was ready to give up already after googling. but thought maybe you, guys, know something because i still had a hope
i still cant understand how can some people behave like this with CD's.
i will probably have to download that file now.
btw, mounting and installing didnt help because i get same error when installing.
ok, i will download that file someday with my 256kb\s (32kB\s) connection!

Your best bet probably is IsoBuster (clicky). The trial version should suffice.

Start it up, browse to and right-click on the filename, select extract and choose a destination.
When the program encounters the first error it will ask you how to proceed.
Check the 'ignore all errors' box and click ignore. Depending on the DVD's damage grade you may now either go to lunch or on a short weekend trip.

Of course, even if extraction succeeds, you will need to repair the data with more specific tools, if that is an option at all.
There is a chance that you can improve your results by using a disc repair kit beforehand.

Regards,
Hive

thank you for your answers. anyway, i have solved the problem this morning
i have mounted .mdf file straight from DVD to virtual drive using Daemon Tools, then copied all files from .mdf to my computer. windows behaved different then - instead of stopping in hard-to-read place, windows was still spinning the DVD and tried to read from that area. though it took quite a lot of time but still it helped and all files are copied and working

Just to reply to rhican:

I'm not sure the CRC apply to the whole disc. Let me explain.

In some course, I learned that CDROM only contains 1/3 of real information (maybe different for DVD), the rest of it is just redundancy to help correct read error in the data. The algorithm used to correct error is designed to recover a "burst" of invalid bit in case of optical media. Cyclic Redundancy Check error means that error in the data couldn't be recovered from the extra-information. The are others algorithm depending of the use. For example, physical layers of network use hamming codes.

In case some of you want to get some more knowledge about those error correcting code : http://www.cs.cmu.edu/afs/cs.cmu.edu/project/pscico-guyb/realworld/www/reed_solomon.ps (highly mathematical, you have been warned )

yes i too believe the CRC is filesystem related.

i know audio cd's have lot of overhead , i don't know how the data formats.

point is that however many copies however many crc's for the one file.

single bit error can cause an entire file to be useless, if the file is 2gig it's a bigger problem ..