squashfs: Squashfs is a highly compressed read-only filesystem for Linux.
squashfs: It uses zlib compression to compress both files, inodes and directories.
squashfs: Inodes in the system are very small and all blocks are packed to minimise
squashfs: data overhead. Block sizes greater than 4K are supported up to a maximum
squashfs: of 1Mbytes (default block size 128K).
squashfs: 
squashfs: Squashfs is intended for general read-only filesystem use, for archival
squashfs: use (i.e. in cases where a .tar.gz file may be used), and in constrained
squashfs: block device/memory systems (e.g. embedded systems) where low overhead is
squashfs: needed.
squashfs: