There are lots of Linux distributions that have a ‘Live CD’ that allow you to rescue your system or try before you bu… install.
Let’s take a look at Knoppix. It is one of the most popular Live CD’s. In the CD structure of Knoppix there is a file that contains the root file system (rootfs). That file is a cloop image file. Each block is compressed individually which allows decompression on the fly or at a specific point in the file.
This allows a rootfs to be about 1 GB in actual size but compressed it will fit into about 700 MB.
When a system boots from this CD …
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