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    Somehow, this reminds me of running Slackware of a FAT filesystem with UMSDOS and loadlin :).

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      This (and MIT Mystery Hunt season) remind me of my favorite command flag:

      file -k
      

      Where the -k means “keep going” and will tell you all the things it might be. Works on this image too!

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        So will the files be accessible from both filesystems? Or, when you mount it as fat you might overwrite ext2 files?

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          If you look at the readme, it uses a feature of FAT to have reserved sectors at the beginning and places the ext filesystem within those reserved sectors .. so it’s two different filesystems that share the same file.

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            I read that yes, but what I mean is, I’d mount it as fat, place a file, umount and mount as ext2, will the file be there?

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              No, there is no translation or exchange of files between the two filesystems. What starts as fat stays as fat and what starts as ext stays as ext.

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                Let A be the format that ignores anything but the very first byte.

                Let B be the format that ignores the very first byte.

                Then consider the following file:

                CA FE
                

                It can be interpreted using both formats. Format A is concerned about the value CA, format B is concerned about the value FE.

                Because the properties of the two formats don’t interfere, they can coexist at the same file, but that doesn’t mean they share any content.