Note 2: don't forget to specify squashfs in your root disk's /etc/fstab or startup scripts when mounting the /usr file system. Insert a root disk in your 3.5" floppy drive (I assume you have a lilo or grub on it, and, thus, a file system exists on this floppy, and the root file system will reside under the /boot directory of this file system):
mounting file system is expected on blockdevice. like when you attach disk or usb key. it will create a node . all operations are done on this node. but when you try using a file instead of device. you need to use loop device. which will use pseudo-device tie with the file. Note while mounting iso as well we need to use -o loop.
I cnnected the USB stick to a running Windows computer and just copied all the files I found there form the USB stick ("My Computer") to the windows computer. The files I copied are some folders (e.g. .disk, boot, casper, dists, EFI and some more.) and some files (e.g. casper-rw, md5sum.txt, menu.c32, README.diskdefines, syslinux.cfg and more.)
It's probably copying files after mounting the squashfs which are files or directories that need editing. Example some files in /usr or /var will be copied over to ram during the boot process, unless the liveCD implemented an overlay filesystem like auFS or overlayfs with the former being used in the Gentoo Linux liveCD which doesn't required copying directories from its squashfs image.
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how to open squashfs file
