An Awesome Tool to Prevent Corruption Of Your Most Important Files



I bet most of you have never heard of this!

MultiPar Download: https://github.com/Yutaka-Sawada/MultiPar

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▼ Time Stamps: ▼
0:00 – Intro & Basics
0:48 – Demo: Corrupting and Repairing a File
2:48 – Demo: Multiple Corruptions in a File
4:29 – Demo: Corrupting the Recovery File
5:33 – Demo: More Details on How it Works
6:21 – Demo: Replacing Completely Missing Files
7:51 – Demo: Explaining MultiPar’s Options
11:38 – A Similar Feature in WinRAR
12:43 – Alternative Programs

This video discusses PAR2 files, which are special recovery files that can be used to repair any kind of damage or missing data from an original file. I demonstrates how to use a program called Multipar, which is for Windows, to create PAR2 files. As an example, I show how even deleting a single character can corrupt the file. PAR2 files can be used to repair the file, but it’s important to also have multiple copies of backups for other reasons. The program divides the file into different segments called blocks, and any of the recovery blocks can be used to repair any damaged blocks in the original file. This type of error correction is known as “Reed-Solomon Error Correction”.

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This Post Has 28 Comments

  1. ThioJoe

    Note: If you don't like the AI translated voice, you can change the audio track back to English with the "Audio Track" option in the gear settings on the video player.
    • Also, if you happen to notice any common terms that are repeatedly mis-translated in a particular language, let me know and I'll try to have it correct next time.

  2. Whoa! I dont use windows but this is a game changer!
    Great video and great showcase of a tool that people need to know about! Much Love!

  3. GoldenBeans

    seems awfully similar to how a RAID 5 would work or i could be completely wrong, anyways a Raid 5 for server storage has 1 extra harddrive of extra space that is not registered as space all drives in that RAID array would have a section of the drive dedicated to error correction perhaps Par2? a Partity , i could be wrong

  4. froggie frog

    Russian translation is not bad, but sometimes it pronounces words wrong. it pronounces SSD as just "ssd" not "S-S-D" or smth. also, there're some moments with mistranslation. It translated "character" as the character from some story. Flipped bit is translated, but I don't think it should have been. and also I don't think word "shit" is the word you want to use in tech stuff things video like this

  5. Jimmy Dandy

    Isn't this reinventing the wheel ? This software does exactly what a hard disk already does, on the fly. When you write a sector to a drive, it also writes ECC bits, same type of ECC. Written data to all media is never perfect, ECC is happening behind the scenes, continually, and you can see that when you view your S.M.A.R.T. for a given hard disk, the ECC value tends to get quite large even on a new drive, your drive is continually correcting – and it will only be a problem if it cannot correct it, and then you will see the uncorrectable count go up, that is very bad and wouldn't happen unless your drive is failing due to defect or the data is severely corrupted, so unless you live in an area where you have cosmic rays and high magnets around, I wouldn't worry – I worked with a lot of hard drives over the years and archival storage, I keep a digest list and verify all my hard drives from time to time, never had a single corrupted file due to bit rot, I've even had hard drives for 10+ years never powered up again, and all files intact, hard disks already use Solomon Reed ECC and when you are writing sectors these reserved bits get written with the data. No matter what it's always good to have backups.

  6. Luke Turner

    5:23 reminds me of a 3blue1brown video explaining Hamming Codes which are a simpler type of error correcting code

  7. Itsjustme

    Joe, at 5:01 you say "Recovery File Complete", but the actual note says, "1 Recovery File Incomplete". Although the result was what you expected, was concerned this might have repercussions late on down the road.

  8. Ramzi Souki

    If the or files end up taking more space than the original file, how is this any better than storing a duplicate of the original?

  9. Naveen N

    Hi @ThioJeo, can you add tamil language in audio track, it would be better for me to understand the video

  10. greatwolf

    yea, I know par2 files. I used to use it back in the day when doing usenet downloads.

  11. Username Hidden

    Hello, thank you for sharing this program; I've been looking for something like this for quite some time. But I have a question: what should I set the media size to? I'll primarily use Multipar for backup archives. Thanks <3

    Edit: My archived zip files are kept on a hard drive.

  12. Romeo Guerrero

    Great video, ThioJoe! I have been using PAR2 files for transfers for years, but never even considered that they could be used to protect against bit rot! Genius!

  13. DankyMankey

    I feel like PC games should adopt this par feature.

  14. Rudy Tabootie

    Any of the recovery data can be used to repair any part of a corrupted file, doesn't matter what's located where. This is actually something called Reed-Solomon Error Correction; and as far as I'm concerned it's absolutely magic. – ThioJoe 01-18-2023

  15. Say I par2ed a set of 200 files. I made a par2 file with 20 recovery blocks.

    Now I have just a single corrupted file (witch consists of 5 blocks) of the Set. Does the par2 algorithm need (some) of the other 199 files to be present to construct the single file or can it recover the file solely with the par2 file?

    I would assume the answer is the former one?

  16. delloda

    I remember using these in my old usenet (alt.binaries) movie and software piracy download days!

  17. Jimmy Scott

    If you use multi par on windows and then a par program on Linux is it an open strand that they can all read those files cross platform and cross different par programs?

  18. Michael Fenley

    We are very dependent on your knowledge. Thank you and please don’t give up on us.

  19. Raja Anquarza

    Ah yes, Recovering System32 using Par files might've been possible now

  20. rager1969

    You can also PAR a set of files, not just individual files. This is handy for a multi-file RAR or ZIP set (i.e., a large file or groups of files archive into multiple .RAR/.ZIP files rather than one large ,RAR/.ZIP file) where if you are missing .RAR/.ZIP files or they are corrupted, those files can be re-built, assuming there PAR2 blocks to cover what's missing/corrupted.

  21. rico goins

    Maybe this will help me not lose my Minecraft worlds again…

  22. Lou F

    Great video subject. PAR might mean parity archive.

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