Crc Error Quickpar
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January 9th, 2011, 6:38 pm I keep getting CRC errors, despite following the various bits of advice in this thread: http://forums.sabnzbd.org/index.php?topic=3409.0 Usually repeating the download fixes the problem, par2 software but that's a waste of bandwidth. So I started experimenting with manually fixing par files repair the failed download, and so far have been able to fix every RAR set that's failed in SABnzbd.Here are the steps:1.
Quickpar Need More Blocks
Re-download the PAR files. NZBMatrix makes this easy (don't know about other index sites) - just click on the name of the NZB file, select the NZB File Details tab, scroll to the bottom,
How To Extract Par2 Files
click the PARs checkbox, then click the Download Selected as NZB button. Note - you can ignore the "Repair failed" message on the downloaded PAR files.2. Copy the PAR files to the same folder as the RAR files from the failed download.3. Open the .par file with QuickPar - you can download QuickPar from http://www.quickpar.org.uk/ 4. When QuickPar is finished repairing the file, run an unrar utility. I've been how to open a par2 file using command line unrar, but it looks like RARZilla is worth a try: http://www.philipp-winterberg.com/softw ... _unrar.php Of course, it would be much easier if SABnzbd would just allow a retry after a CRC error. It's a mystery to me why the error occurs with SABnzbd, but not when I manually repair and unpack. I understand that SABnzbd 6 will offer a retry feature. Last edited by guitarboy on January 9th, 2011, 6:40 pm, edited 1 time in total. guitarboy Newbie Posts: 34Joined: January 7th, 2010, 2:44 am Top Re: Manually fixing CRC Errors by shypike » January 10th, 2011, 6:08 am guitarboy wrote:I understand that SABnzbd 6 will offer a retry feature.It will.What kind of CRC errors do you get?In articles or when unpacking the RAR files? shypike Administrator Posts: 20919Joined: January 18th, 2008, 12:49 pm Top Re: Manually fixing CRC Errors by guitarboy » January 10th, 2011, 4:06 pm The errors usually occur during unpack. E.g.Repair:[mydownload] Quick Check OKUnpack:[mydownload] ERROR: CRC failed in "mydownload.mkv" guitarboy Newbie Posts: 34Joined: January 7th, 2010, 2:44 am Top Re: Manually fixing CRC Errors by shypike » January 10th, 2011, 7:01 pm Can you send me an example of an NZB that shows this behaviour?b
instead. This means that a single-byte error in a 10MB file would require the use of one whole PAR file to reconstruct the damaged file. All of the PAR files are of equal size and
How To Open Par Files
contain enough recovery data to reconstruct the largest source file. This means that if you how to use quickpar have source files of varied sizes and the smallest one is damaged, then you still need a whole PAR file to reconstruct quickpar alternative it. When PAR is used on UseNet, this could mean that you have to download a 10MB PAR file to reconstruct a 3MB data file. Damaged PAR files are of no use during reconstruction. A single https://forums.sabnzbd.org/viewtopic.php?t=5957 byte error to a PAR file renders all of the recovery data it contains useless. When used with small numbers of source files, it is very inefficient and you need to create an excessive number of PAR files to achieve a desired level of protection. For this reason, files are normally split into many equal sized pieces and PAR files generated from those pieces. It cannot handle more than 255 files. PAR 2.0 either http://www.quickpar.org.uk/AboutPAR2.htm completely removes or significantly reduces these limitations: Damaged files can be repaired. A single byte error in a 10MB file might only requires the use of recovery data from a PAR file that is only 100KB in size. There is no relationship between the size of the data files and the size of the PAR files. Also, the PAR files will normally be of varied sizes allowing you to pick the size you need appropriate to the amount of damaged data you need to repair. Damaged PAR files will still be useable. PAR 2.0 can use the undamaged parts of a PAR file. PAR files can be generated from a single source file without the need to split it. On UseNet, this removes the need to use RAR or any other file splitter. Please note however, that due to the limitations of some newsreaders (which do not permit the download of incomplete files), it is advisable to use RAR to split very large files. It can handle up to 32768 files. So how exactly does PAR 2.0 remove all of these limitations? Top The limitations of PAR 1.0 are all due to the fact that it operates on "whole" files. PAR 2.0 operates by "virtually" splitting the files you wish to protect into many smaller "slices" (or b
PAR2 file in Windows Explorer, or start QuickPar and click "Open". QuickPar will immediatly start analysing the http://www.quickpar.org.uk/VerifyingAndRepairing.htm PAR2 files and verifying the files that they protect. You will http://www.ghacks.net/2014/07/28/repair-extract-broken-rar-archives/ see the following window: You will see in the above screenshot that all of the data files are complete and that the PAR2 files contain the correct number of recovery blocks. At this point you can Click "Clear" and then "Open" to open another PAR2 how to file, "New" to create new PAR2 files, or "Exit" to exit from QuickPar. Repairing damaged files If the data files are damaged, then QuickPar will display the following: The information displayed shows that 33 of the 35 files are damaged and that the repair will require 96 blocks of recovery data. At this point you can have how to open QuickPar load additional PAR2 files (to provide more recovery blocks) or scan additional data files (to see if they contain some of the data from the original files). To do this click the "Add" button and select the additional files. You can also select the "Monitor" checkbox and QuickPar will automatically scan new files as soon as they appear (e.g. if you need to obtain more files from UseNet). The screenshot below shows the results after some PAR2 files have been obtained and loaded: You will see that two PAR2 files have been obtained with a combined total of 113 recovery blocks and the QuickPar now indicates that repair is possible (using 96 of the available recovery blocks). You should click the "Repair" button to start the repair. When you start the repair, all of the damaged files will be renamed (with a ".1" file extension). Once the repair has been completed, QuickPar will automaticaly verify the repaired files: Copyright © 2015 Peter B. Clements. All Rights Reserved.
Brinkmann on July 28, 2014 in Internet - Last Update:July 28, 2014 2Broken, damaged or corrupt archives can be quite annoying. It does not really matter if an archive that you have created locally is not working anymore, or if you have downloaded Megabytes or even Gigabytes of data from the Internet only to realize that one or multiple of the files of the archive are either damaged or missing completely.That does not mean that the data cannot be repaired or extracted anymore. Depending on the circumstances, you may be able to recover the archive fully, or at least partially.When you try to extract a broken RAR archive, you will receive a prompt requesting that you select the next file in line manually from the local system, or receive the error "CRC failed in file name" in the end.This is a dead giveaway that a volume is missing or damaged, and that some of the extracted files may be corrupt or even non-present as a consequence.When you receive that message, you have a couple of options to proceed.1. Recovery RecordsWhen you create a new archive using WinRAR, you can add so called recovery records to it. To do so, you simply check the "Add Recovery Record" box when the archive name and parameters dialog appears.You can only do so if you are creating a multi-file RAR or RAR5 archive, and not when you use ZIP as the archive format or want to create a single file only.The recovery information increases the archives size by 3% by default. This means basically that you will be able to restore up to 3% of missing or damaged data by default.You can switch to the advanced tab to modify the percentage to either increase or decrease it.The recovery record is added to the directory the archive is created in. Each file begins with rebuilt so that you always know that this is a recovery file and not part of the original archive.To recovery the RAR file, you open it in WinRAR, right-click all archives, and select the repair option from the menu. WinRAR will pick up the recovery volume or volumes automatically and use them to repair the archive and add the fixed files to the system.2. PAR FilesSo called Parity files offer a second option. They are often used on Usenet, but come in handy for backups and in all other situations where you need to move large archives to another location.What makes PAR files great is the fact that you can repair any part of an archive using them. As long as they are at least equal in size to the damaged part, they can be used to repair the archive.If you have never heard about PAR or PAR2 files before, c