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This has nothing to do with compression. What SexxxySites said is that when he DECOMPRESSED it, it showed file size : 396 MB, and on disk: 826MB. A decomressed file is a decompressed file.
Chances are, Sexxxysites, you did not grab all of your files. Better check again.
If you find all your files and are 100% you've compressed then decomressed them, you may still notice a file size descrepency, this may be because the term "megabyte" is ambiguous because it is commonly used to mean either 1000 bytes, squared, or 1024 bytes squared, depending who you ask, or what program is reading the disk, or even what operating system you are using.
And FYI, When used to describe data transfer speed as in MB/s (not Mb/s), it refers to one million bytes (not 1024).
Thus ends the lesson for today.
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