You can ignore the index file since Parchive can handle a missing index file. In order to repair the downloaded file(s). This is very efficient in terms of bandwidth usage. If your download left you with 43 corrupted data blocks, you could convert the number to binary and instantly see what recovery files you had to fetch: In the early days where no integrity check was done on link level these files proved useful since one could select recovery files based on the number of data blocks gone corrupted. The number left of the plus sign is the index of the first recovery block in the particular file and the number on the right the number of recovery blocks the file provides. If you created, say, 592 recovery blocks, you will find the files Additionally, it has created the recovery blocks and has spread them into multiple files. Parchive now has created the file.par2 index file which is essentially not needed for recovery. Let us say you want to calculate 30% of recovery information for a precious file: You need as much recovery blocks as data blocks have gone corrupted in order to repair the file(s) successfully. Later, you can trade any recovery block for any corrupted data block in order to repair the source data. Based on the data blocks, par2create then creates recovery blocks with the help of the w:Reed–Solomon error correction code. Par2create takes the input file(s) and interprets the input as a certain number of data blocks. The commands par2, par2create, par2verify and par2repair are now available. Parchive (Parity archive) is a file verification and repair tool using PAR2 files to detect damage in data files and repair them if necessary.
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