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The process of secondary compression of a compressed file is essentially the same as the process of primary compression of a normal file. However, it's worth noting that if the original compressed file already uses an efficient compression algorithm, secondary compression may not significantly reduce the file size, and sometimes it may even result in a slight increase in file size due to the increase in compressed metadata.
Nonetheless, here are the general steps on how to do secondary compression, here using a common compression tool like 7-Zip, Winrar, or WinZip as an example:
Install 7-zip: If you don't have 7-zip installed, you can install it from the 7-zip website**.
Select the compressed file you want to recompress: Find the compressed file you want to recompress in File Explorer.
Right-click and select "7-zip": Right-click on the file, select "7-zip" from the context menu, and then select "Add to Zip File....”。
Set compression options: In the pop-up dialog box, you can select the compression format (such as zip, 7z, etc.), compression level, encryption, and other options.
Start compression: Once you have configured all the options, click "OK" to start the compression process.
Install Winrar: If you don't have WinRAR installed, you can install it from WinRAR's official website**.
Select the file you want to recompress: Find your compressed file in File Explorer.
Right-click and select Add to Archive: Right-click and select Add to Archive from the context menu....”。
Configure compression settings: In the WinRAR pop-up window, set the archive name, format, and compression method.
Click "OK" to start compression.
Install WinZip: If you haven't already installed WinZip, visit the WinZip official website** and install it.
Right-click the file you want to compress: Locate and right-click the compressed file you want to compress twice in File Explorer.
Select the winzip option: Select "WinZip" in the context menu and then "Add to Zip File".
Set compression parameters: In the WinZip dialog, you can customize the name of the compression file, the compression type, and so on.
Confirm that compression begins.
Secondary compression may not always work, especially for file formats that are already highly compressed, such as JPEG**, MP4**, or files that use high compression ratios.
Consider the purpose of compression: if it is to further reduce the file size, evaluate whether the effect of secondary compression is worth it; If you want to consolidate multiple packages into one or add password protection, secondary compression may be a good option.
In conclusion, the process of compressing a compressed file twice is similar to the first compression, but its actual effect will vary depending on the compression ratio of the original file and the compression tool chosen. Before you decide to do secondary compression, think about the purpose of compression and the desired result.
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