Transferring Files

  Spr 15:56 20 Oct 2005

Using Window PX & Word 200 I have copied some Word & Pdf files onto a CD with the idea of transferring them to an old PC I use as a back up.

The files are only family tree files.

Half way through transferring them I keep getting “Cannot Copy Data Error (cyclic redundancy check)”
OR ”Cannot Read From the Source File or Disc”

There is plenty of space on the Hard Drive.

  Fruit Bat /\0/\ 16:03 20 Oct 2005

In simple terms, a CRC is bit of mathematics used to ensure that your data is OK when being transfered. It's a checking procedure that quickly identifies when data has been damaged. If you get this message, it means that the file being read by your PC or software is corrupted. However, it does not mean all the data is lost forever. When data is transfered, it is usually in small blocks and each block is given a CRC value. If something goes wrong with the data between the time it leaves the source and arrives at its destination, the CRC sent at the source will no longer match the one that is calculated when the data arrives - this is when the cyclic redundancy check error will appear.

The most common times you will see the cyclic redundancy check error message is when trying to read data from a damaged CD or DVD. Just before it appears, your CD/DVD drive will probably grind and whirl away - your PC may also become a little slugglish.

Less frequent causes are the result of system crashes, and buggy software (hello Microsoft), incomplete downloads (often identified by the misleading message 'This is not a valid Windows file', 'This is not a valid win32 application' or 'Corrupt Zip file'). If this problem happens frequently with downloads, try using a download manager like GetRight. If you have lots of zip files on your system and want to check they are still valid, get a copy of CRC Checker - it's free and can validate zip or rar files in batches - which is much easier than doing it one at a time. This program is worth downloading and keeping on hand for when problems strike.

For CDs and DVDs, the problem is a little different. Normally, when CD/DVD drives get a CRC message from a disc, they try to read the disc again - hence the grinding sound. After several failed attempts, they give up and display the redundancy check error. The problem can be hardware (loose cables, failing drive), software or damaged media. In most cases checking and cleaning the disc is the easiest way to overcome the problem. If different clean discs produce the same error, it is likely to be a hardware issue (check the discs in another drive). Another common cause of these errors is poorly burnt CDs and DVDs - especially those that had numerous or severe buffer underuns. USB burners suffer from this problem when the burn speed is too high (generally above 4X-8X)

  retep888 16:05 20 Oct 2005

FAT 32 doesn't read NTFS files.

  PaulB2005 16:11 20 Oct 2005

"FAT 32 doesn't read NTFS files."

True but whilst the files are on CDs they are in CDFS and that can be read by FAT32.

  DieSse 16:12 20 Oct 2005

"FAT 32 doesn't read NTFS files."

Files are files - they're not FAT32 or NTFS (or anything else for that matter). FAT32 and NTFS are filing systems (ie the way data/files are organised on a drive). CDs are neither FAT32 or NTFS.

As Fruit Bat /\0/\ explained, it's probably a bad CD - the errors are basically read errors on the CD.

  retep888 16:29 20 Oct 2005

Didn't read the question carefully, thought he's transferring files from NTFS to FAT,typed and forgot to refresh before post, didn't see Fruitbat's post, nothing against him, no hard feelings.

Big apologize!

  PaulB2005 16:31 20 Oct 2005

"Big apologize! "

No need. We all occassionally "mis-fire".

  Spr 17:37 20 Oct 2005

Both systems are NTFS most likely the CD wants changing Thanks for the help

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