7-zip default compression level (split from solid block thread)

[Guillaume]

Code: Select all

Compression Level  Solid Block Size LZMA2 
0 - Store    0 B 
1 - Fastest  64 MB 
2   1 MB     256 MB 
3 - Fast     1 GB 
4   16 MB    4 GB 
5 - Normal   8 GB 
6   64 MB    16 GB 
7 - Maximum  16 GB 
8   256 MB   16 GB 
9 - Ultra    16 GB  

Seeing this list and considering that this means that 5 = Normal for 7-Zip, I wonder why TC uses "normal compression (6)" in the "7-Zip Compression" setting.

It's been discussed before from https://www.ghisler.ch/board/viewtopic.php?p=463483#p463483 on, but probably not in terms of the solid block size, which in fact does differ between 5 and 6.

[ghisler(Author)]

I have split this message from the thread TC 11.51: Error in 7-Zip Solid Block archiver settings!!! because it's unrelated.

I have chosen to use 6 as default and not 5 because 6 was already the default for ZIP archives.

[Guillaume]

I think it's a bit confusing to be honest. It might not have consequences for the output size in most cases, but it does introduce an inconsistency with regard to what 7-Zip users are accustomed to.

Just my 2 cents, others might feel using normal (5) introduces an inconsistency in TC, but I don't think there has to be any consistency "between packer settings" if that doesn't align with how the packers actually handle things.

[ghisler(Author)]

For now I will leave it as it is, sorry.

Moderator message from: ghisler(Author) » 2025-05-13, 09:32 UTC

Moved to will not be changed