Create solid file without corrupt files

[A Computer Guy]

I never compressed in 7z, what settings should I change to have good compression without corrupting?

I was in doubt between winrar and 7zip and the rar or 7zip format

You can drop the "without corrupting" because if these utilities were corrupting nobody would be using them. As far as I know they are both reliable tools.

You can choose whatever compression level meets your needs. There is no good or bad compression. Higher compression will take longer and generally produce smaller files depending on the content you are compressing. In 7zip compression level 0 - store - will simply lump your files together without compressing them into a single 7z file and this is the fastest mode for obvious reasons.

If you are in any doubt just start with the defaults and try it.

 

[gamer87fla]

7zip compression level 0 - store -

Is this the fastest compression and decompression method among all software?

Does this 7zip format have an option to test and search for corrupted files like winrar?

 

[ir_cow]

Rar has a option for redundancy and CRC check. I'm sure 7zip does as well.

 

[Bill_Bright]

So the problem would be in the storage media and not in the corruption format or software used?

Nobody said that! You really must read what everyone has been saying.

A Computer Guy summed it up nicely when he said,

Corruption can come from hardware, software, or the medium you store your data. All you can do is use good hardware, software, and a quality medium in conjunction with having multiple backups where you can verify the integrity in case you have to pull from them.

I would recommend leaving everything unzipped and individual and getting more storage..................if its affodable or an option?

I agree. Since these files already are being stored somewhere, not sure getting more storage is necessary or that affordability is an issue. And remember, since you are dealing with files that have already been compressed, freeing up a bunch of space is not going to happen. Any extra space you "might" achieve will be negligible and (because of the new overhead zipping files creates) may even result in more space being consumed.

 

[gamer87fla]

I don't want to compress or compress anything else I just want to generate a single file with all these files and folders inside it 150gb

What format do you recommend? 7zip or rar or something else?

which software?

what compression settings?

just these 3 questions

 

[Bill_Bright]

Like I said, you really need to be reading what people are saying. You have been given answers to your questions. You just need to try them and see which works best for you.

 

[oiawshboiwsahnoidaws]

I don't want to compress or compress anything else I just want to generate a single file with all these files and folders inside it 150gb

What format do you recommend? 7zip or rar or something else?

which software?

what compression settings?

just these 3 questions

All three zip, 7zip, rar are old and proven formats, all support just storing files instead of compressing them, all use crc32 which makes it possible to check against corruption (rar can also use blake2 hash)
If you already use winrar just use that then
btw i just noticed windows 11 explorer can open/extract .7z, .rar by itself... kinda neat

 

[gamer87fla]

what compression settings is good?

 

[oiawshboiwsahnoidaws]

Just use default settings, add recovery record and solid archive if you want and be happy
More info on what recovery record is: https://www.win-rar.com/recovery-record.html
Not super important if you do multiply copies anyway tho

 

[gamer87fla]

thanks

What is the function of marking create solid file? maximize error and corruption correction?

 

[oiawshboiwsahnoidaws]

Nah solid archive has nothing to do with error/corruption correction but increasing compression ratio when dealing with tons of uncompressed files that are similiar
read here

Solid archives - WinRAR Documentation

documentation.help

Solid compression - Wikipedia

en.wikipedia.org

 

[gamer87fla]

is good option?

 

[oiawshboiwsahnoidaws]

It depends... its really good if you have crazy number of files that are small and have same file type but if you archive just few files that are big and/or compressed already solid archive isn't useful and i wouldn't use it

 

[gamer87fla]

in the folders there are many console rom files in 7zip or zip format, some exe, others common

 

[oiawshboiwsahnoidaws]

Just try archiving with and without and if resulting solid archive .rar is a lot smaller use solid archive if not don't

 

[gamer87fla]

solid archive option, more compact more chance corrupt files

 

[A Computer Guy]

solid archive option, more compact more chance corrupt files

How compact a compressed file has no bearing on increasing or decreasing the chances of corruption of the file. If you want to deal with the chances of corruption effectively you need solutions and procedures for redundancy, validation, and recovery. I feel like you are stuck on this idea of avoiding corruption and using an archive to somehow achieve that. I'm just concerned about accidently leading you down the wrong path or perhaps to the wrong conclusion. It's one thing to create an archive but it's a different thing to implement a disaster recovery plan if you encounter a corrupted file that you want to recover.

 

[gamer87fla]

I will compress it in rar or zip with winrar then I will test button inside winrar then I will save the file in several media

 

[A Computer Guy]

I will compress it in rar or zip with winrar then I will test button inside winrar then I will save the file in several media

ok that sounds like a plan

 

[gamer87fla]

what media is more secure for store large files?

 

[izy]

How compact a compressed file has no bearing on increasing or decreasing the chances of corruption of the file. If you want to deal with the chances of corruption effectively you need solutions and procedures for redundancy, validation, and recovery. I feel like you are stuck on this idea of avoiding corruption and using an archive to somehow achieve that. I'm just concerned about accidently leading you down the wrong path or perhaps to the wrong conclusion. It's one thing to create an archive but it's a different thing to implement a disaster recovery plan if you encounter a corrupted file that you want to recover.

I think he wants something like in case the compressed file gets corrupted to still be able to access the contents of it (maybe less the part that was corrupted, lets say only few files from it) but i dont think its possible that way with RAR / 7zip as far as i know. (just guessing)
Edit: ahh seems WinRar has recovery-record

what media is more secure for store large files?

I think all formats are equally secure from corruption.

 

[A Computer Guy]

what media is more secure for store large files?

For basic security you want to look into encryption. For example encrypting your archives is one approach and 7zip and RAR both provide built-in options for this.
There are other solutions as well such as external USB drives that support encryption, or creating encrypted optical media, or (timidly I mention) cloud services that include encryption.

Different media will have different requirements to how you can store that archive on the media based on the file system being used. For example optical media might require you to split your archives into multiple files to accommodate file system limitations and/or limitations in the individual capacity of the media. 150GB of data needs about 19 or so 8GB dual layer DVD's but your archive may need to be split into even smaller chunks 2GB or 4GB. (I forgot what the limit was)

External USB media formatted as EXT4, NTFS, exFAT support very large file sizes. The file system you choose will likely depend on what you plan to use to access the device when needing to recover data. Keep in mind a caveat to very large files is if there is a failure to transfer the file to a new medium you often have to start over again unless you have an explicit means that allows you to continue where the interruption started. For example if a typical file copy in windows gets interrupted then you have to redo the file copy over again from the start.

Of course with any media you need to store and handle them appropriately to avoid damaging them. All physical media degrades over time and is subject to failure which needs to be taken into account with your backup/recovery plan.

 

[izy]

For basic security you want to look into encryption. For example encrypting your archives is one approach and 7zip and RAR both provide built-in options for this.
There are other solutions as well such as external USB drives that support encryption, or creating encrypted optical media, or (timidly I mention) cloud services that include encryption.

Different media will have different requirements to how you can store that archive on the media based on the file system being used. For example optical media might require you to split your archives into multiple files to accommodate file system limitations and/or limitations in the individual capacity of the media. 150GB of data needs about 19 or so 8GB dual layer DVD's but your archive may need to be split into even smaller chunks 2GB or 4GB. (I forgot what the limit was)

External USB disks formatted as EXT4, NTFS, exFAT support very large file sizes. The file system you choose will likely depend on what you plan to use to access the device when needing to recover data. Keep in mind a caveat to very large files is if there is a failure to transfer the file to a new medium you often have to start over again unless you have an explicit means that allows you to continue where the interruption started. For example if a typical file copy in windows gets interrupted then you have to redo the file copy over again from the start.

Of course with any media you need to store and handle them appropriately to avoid damaging them.

You went the encryption route , i was thinking that he refers to "secure from corruption"
Edit: I edited my other post to be less confusing for OP

 

[A Computer Guy]

You went the encryption route , i was thinking that he refers to "secure from corruption"

It's ok. I think in part the OP needs clarification with terminology in which case Bill is exceptionally better at writing those narratives than I while also covering various permutations.
I admit I may have misinterpreted the OP's question now that I look at it from different angles.

You went the encryption route , i was thinking that he refers to "secure from corruption"
Edit: I edited my other post to be less confusing for OP

Well different file systems do have different characteristics when it comes to dealing with corruption issues. FAT32 vs exFAT vs NTFS vs BTRFS vs ZFS etc...
I am not intimately familiar with them to narrate a comparison without more research.
Too keep it simple I would say use the file system that is most convenient and buff the potential of corruption with redundancy (multiple copies).

 

[Solaris17]

what media is more secure for store large files?

media reliable long term storage?

What is the most reliable long-term storage media for large files many GB? media to record and store and be safe to humidity and temperature environmental conditions?

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