This software is one of the peculiarities of Usenet downloads and you will make on newsgroups.
Indeed, it is not uncommon to download incomplete files. But do not worry because everything is there for your convenience and even to automate it without you having to worry about such problems.
When you download a collection of files, there will almost always file called "parity". They have the extension PAR or PAR2.
They will serve you just to check whether your downloaded files are not damaged.
If they are, it is also thanks to these files you can fix everything.
Verification, repair and decompression integrated with grabbers
Now, the most popular grabbers directly integrate a module that will automatically check your downloads.
If repair is necessary and that PAR or PAR2 files are downloaded in the collection, the grabber will attempt a repair.
If the repair fails, it will find other files parity, or find the same content in another newsgroup or another date (happens infrequently).
Is now found mostly PAR2 files, changing PAR files
What grabbers have such a feature?
Newsleecher
Newsleecher is very effective to do that.
In these options, you will find settings so that automatically puts Newsleecher pause PAR2 files present in the queue.
It will download by priority against the PAR2 index file to be able to check each file downloaded.
If no repairs are necessary, it will download other files not PAR2 and move to stage decompression.
An effective grabber Usenet: Newsleecher
NiouzFire
NiouzFire is a grabber that I recommend.
This is a grabber and Free French.
It is easy to use and setup. And it has a verification module / repair / decompression of your downloads.
What you ask for as they say ...
NiouzFire, French Free Grabber
The software used for repairing, checking and decompressing data
If your grabber does not have such features, you should really change for one of those mentioned above.
Otherwise, and also because sometimes you'll need another program dedicated to this use, you can use QuickPar.
QuickPar
QuickPar is a free software that will use PAR files, PAR2 or SFV to verify data.
As well, it will also repair these files if needed.
QuickPar will be useful in some cases, and to know where I invite you to read our page dedicated to QuickPar.
Download QuickPar: Video tutorial
Definition of the lexicon of Newsgroups:
Data Repair
Data compression
Decompressing data
PAR2 file
SFV file
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