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This refers to the compression archive format (7-Zip). The fact that the portable release is packaged as a .7z file (rather than .zip or .exe ) suggests a focus on efficiency—7z offers superior compression ratios, meaning a smaller download.
: You can easily bundle files from your hard drive into a single ISO image. Open PowerISO, click New , add your files, and select Save . poweriso90x86x64portable7z verified
The 7z compression format provides a much smaller file size compared to standard ZIP or RAR, making it faster to download and store. This refers to the compression archive format (7-Zip)