re: CRC Failures & Random Errors
Thursday, February 5, 2004 at 9:51 pm
Windows 2000 Annoyances Discussion Forum
Posted by DEX
(11847 messages posted)
Billy
Long shot what ver of Winzip are running ?
You can try a newer ver to see if that helps....
Most files you download are zipped up but not all but if you have install Winzip
on your machine it will take control of many files that you download..
see note about CRC errors below..
WZ91 - CRC Error
About CRC Errors
A CRC error indicates that some data in your Zip file is damaged. CRC stands for
“cyclic redundancy check”. It is a calculation made from all the data
in a file to insure accuracy in transmission. When you add a file to a Zip file,
WinZip calculates a CRC value for the file and saves the value in the Zip file.
When you later extract the file from the Zip file, WinZip® calculates the CRC of
the extracted file and compares it to the value stored when the file was zipped.
If these two CRC values do not match, the file that was extracted does not match
the original file, and WinZip will display a “CRC Error” message.
When the data in a Zip file is damaged, it may not be possible to extract all of
the files from the Zip file correctly. Damaged data can affect the entire Zip file,
multiple files, or just one file.
Why CRC Errors Occur
There are many possible causes for data damage. Among the most common is telephone
line noise or some other transfer error when downloading a Zip file from an online
source such as the Internet, AOL, or CompuServe. Such an error can introduce invalid
data into a Zip file. Some other possible causes include exposure of disks to excessive
temperatures or magnetic fields, cross-linked disk sectors, and mechanical problems
with disk drives.
What to do if a CRC Error Occurs
The best solution to the problem of a damaged Zip file is to try to obtain another
copy of the file. For example, use your backup copy of the file or get a new copy
from the original source. If you obtained the Zip file by downloading it, then downloading
it again will almost always solve the problem.
CRC Errors on Removable disks
If the damaged Zip file is on a removable disk, the removable disk may be physically
damaged, or the data on it may have been corrupted. In these cases, the only completely
reliable solution is to use another copy of the disk or Zip file that is undamaged.
There are, however, two other situations in which it may be possible to recover
some files from a removable disk.
· The removable disk drive that you are using to unzip the Zip file may be malfunctioning.
Try using a different disk drive, if possible.
· If the removable disk drive you are using to unzip the Zip file is not the same
drive that was used to store the Zip file on the removable disk, and you have access
to the original drive, try using this drive to unzip. It is possible that the original
drive may be able to read the disk; if so, you can extract your files using this
disk drive (and have your removable disk drives checked out--at least one of them
may be out of alignment). Otherwise, the removable disk itself or the data on it
is probably damaged
Copyright © 1991-2000 by WinZip Computing, Inc. All rights reserved.
See the help in Winzip for more info on CRC errors
DEX
Hope this helps
On Thursday, February 5, 2004 at 9:09 pm, Billy wrote:
>Every file I download (from anywhere, including Windows update) gives at least one
>CRC error, rendering it useless. I have tried several OS's including windows 98se,
>XP and 2000 and the errors are all alike. Windows update will never unpack and install
>correctly. Explorer, and many other background apps shut down. In the events log,
>it's full of errors related to the COM+ with various error codes. I have ran several
>tests on my hardware, including ram tests, surface scans on my HD and my next test
>will be to flash my BIOS. I've done several format+clean installs. It must be something
>to do with hardware...
>
>If anyone has any comments or suggestions, I would really appreciate it, thanks.
>
>Billy
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