video

reed22 · 07-26-2006, 12:39 PM

Hi everyone,
I have always played this video on my PC without problem. Recently it wouldn't open/play. I tried to copy the video file onto the desk top, this is the message I received:

"Cannot copy music02 (name of the file). Data error (cyclic redundancy check)."

Could anybody help here.

Cheers,

Rida

**Sum Yung Guy** · 07-26-2006, 12:47 PM

Regardless of how the data is stored (on a floppy or on a CD or even
transmitted over the internet) Cyclic Redundancy Checks (CRC) are
there to detect errors. Basically, due to dust or scratches or
whatever, there is some chance that what the laser in the CDROM reads
of the CD is not actually what was written on the CD. The CRC is just
extra bits written on the CD which need to match the original data.
The CDROM reads the regular data, and the CRC bits off the CD and if
the CRC bits don't match the data bits, then it means that the CDROM
has read some incorrectly off the disk.

So after saying all of that, here is the conclusion:
1) Either your CD is defective, scratched, dirty etc.
2) Your CDROM lens is dirty or scratched etc.

Try this CD in a friends CDROM drive. If it reads properly there,
then the problem is most likely with your CDROM drive. If the CD doesn't work in your friends CDROM, then its most likely a
problem with the CD.

reed22 · 07-27-2006, 01:38 PM

Quote:

Originally Posted by Sum Yung Guy

Regardless of how the data is stored (on a floppy or on a CD or even
transmitted over the internet) Cyclic Redundancy Checks (CRC) are
there to detect errors. Basically, due to dust or scratches or
whatever, there is some chance that what the laser in the CDROM reads
of the CD is not actually what was written on the CD. The CRC is just
extra bits written on the CD which need to match the original data.
The CDROM reads the regular data, and the CRC bits off the CD and if
the CRC bits don't match the data bits, then it means that the CDROM
has read some incorrectly off the disk.

So after saying all of that, here is the conclusion:
1) Either your CD is defective, scratched, dirty etc.
2) Your CDROM lens is dirty or scratched etc.

Try this CD in a friends CDROM drive. If it reads properly there,
then the problem is most likely with your CDROM drive. If the CD doesn't work in your friends CDROM, then its most likely a
problem with the CD.

---
Many thanks!

Rida (from Baghdad)

07-26-2006, 12:39 PM	#1 (permalink)
reed22 Registered User Join Date: Feb 2006 Posts: 7 OS: XP	video Hi everyone, I have always played this video on my PC without problem. Recently it wouldn't open/play. I tried to copy the video file onto the desk top, this is the message I received: "Cannot copy music02 (name of the file). Data error (cyclic redundancy check)." Could anybody help here. Cheers, Rida Last edited by reed22; 07-26-2006 at 12:40 PM.

07-26-2006, 12:47 PM	#2 (permalink)
Sum Yung Guy I helped the forums. Join Date: Jul 2006 Location: Ramadi, Iraq Posts: 34 OS: WinXP Pro My System	Regardless of how the data is stored (on a floppy or on a CD or even transmitted over the internet) Cyclic Redundancy Checks (CRC) are there to detect errors. Basically, due to dust or scratches or whatever, there is some chance that what the laser in the CDROM reads of the CD is not actually what was written on the CD. The CRC is just extra bits written on the CD which need to match the original data. The CDROM reads the regular data, and the CRC bits off the CD and if the CRC bits don't match the data bits, then it means that the CDROM has read some incorrectly off the disk. So after saying all of that, here is the conclusion: 1) Either your CD is defective, scratched, dirty etc. 2) Your CDROM lens is dirty or scratched etc. Try this CD in a friends CDROM drive. If it reads properly there, then the problem is most likely with your CDROM drive. If the CD doesn't work in your friends CDROM, then its most likely a problem with the CD.