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--- archive_types [2024/04/27 15:49] – [How does the compression ratio of ZSTD compare to Deflate and LZMA?] johnsanc
+++ archive_types [2024/04/27 16:15] (current) – [Table] johnsanc
@@ Line 7: / Line 7: @@
 | {{ :set:ziptdc.png?50&nolink |tdc zip}}                   | TDC Zip               | Deflate (9)  | Specified by DAT     | A new normalized standard that preserves dates                                                          | Archives may not match existing sources                                                   | Total DOS Collection. Automatically used with DOSCenter DATs.                                                            |
 | {{ :set:zipzstd.png?50&nolink |zstd zip}}                 | ZSTD Zip              | ZSTD (19)    | Null                 | Compression ratio between Deflate and LZMA, very fast decompression, multithreaded                      | Not widely supported yet, but works with WinRAR and 7-zip                                 | People who want a better compression ratio and faster decompression than Deflate.                                        |
-| {{ :set:sevenzipnlzma.png?50&nolink |non-solid lzma 7z}}  | Non-Solid LZMA 7z     | LZMA (9)     | Null                 | Excellent compression, raw copy supported                                                               | Extremely slow, single threaded                                                           | People who want to sacrifice some compression ratio over solid LZMA for the ability to raw copy files between archives.  |
+| {{ :set:sevenzipnlzma.png?50&nolink |non-solid lzma 7z}}  | Non-Solid LZMA 7z     | LZMA (9)     | Null                 | Excellent compression ratio, raw copy supported                                                         | Extremely slow, single threaded                                                           | People who want to sacrifice some compression ratio over solid LZMA for the ability to raw copy files between archives.  |
-| {{ :set:sevenzipslzma.png?50&nolink |solid lzma 7z}}      | Solid LZMA 7z (RV7z)  | LZMA (9)     | Null                 | Excellent compression, especially for many files packed together                                        | Extremely slow, single threaded, must unpack completely for any fix                       | People who care about compression ratio only and don't care how slow LZMA is.                                            |
+| {{ :set:sevenzipslzma.png?50&nolink |solid lzma 7z}}      | Solid LZMA 7z (RV7z)  | LZMA (9)     | Null                 | Excellent compression ratio, especially for many files packed together                                  | Extremely slow, single threaded, must unpack completely for any fix                       | People who care about compression ratio only and don't care how slow LZMA is.                                            |
 | {{ :set:sevenzipnzstd.png?50&nolink |non-solid zstd 7z}}  | Non-Solid ZSTD 7z     | ZSTD (19)    | Null                 | Compression ratio between Deflate and LZMA, very fast decompression, multithreaded, raw copy supported  | Poorly supported, only works with zstd fork of 7-zip                                      | Default 7z structure for archives that need to be repacked in ToSort directories.                                        |
 | {{ :set:sevenzipszstd.png?50&nolink |solid zstd 7z}}      | Solid ZSTD 7z         | ZSTD (19)    | Null                 | Compression ratio between Deflate and LZMA, very fast decompression, multithreaded                      | Poorly supported, only works with zstd fork of 7-zip, must unpack completely for any fix  | Archives with many small files that likely won't change often, and you want fast decompression speed.                    |
@@ Line 29: / Line 29: @@
   * It supports multi-threaded compression
   * Its standard levels are 1-19, and ultra levels are 20-22 which require significantly more memory
+  * Its updated periodically, but RomVault uses ZSTD version 1.5.5, which will not change for the foreseeable future in order to ensure deterministic behavior