Using SquashFS As A Read-Only Root File System
magazine.odroid.com › article › using-squashfs-as-aFeb 01, 2018 · SquashFS ( http://goo.gl/WT6Lxf) is a compressed read-only file system for Linux on ODROID-XU4 based system series like the HC1, HC2, MC1 and XU3. RootFS ( http://goo.gl/LMVjzS) corruption rate after power failures will be significantly reduced because SquashFS is a very robust file system. Note that a properly working built-in SquashFS is available in Kernel 4.14.5-92 or higher.
[OpenWrt Wiki] Image formats
https://openwrt.org/docs/techref/image.formatsquashfs This firmware contains a type of partition that is compressed and mounts read-only. All modifications (file edit, new files, deleted files) are committed to an overlay. .bin/.chk/.trx See also TRX vs. TRX2 vs. BIN initramfs Can be loaded from an arbitrary location ( most often tftp ) and is self-contained in memory.