what is initrd image?

Answer Posted / renjith

initial RAM disk (initrd) is a temporary root file system
that is mounted during system boot to support the two-state
boot process. The initrd contains various executables and
drivers that permit the real root file system to be
mounted, after which the initrd RAM disk is unmounted and
its memory freed. In many embedded Linux systems, the
initrd is the final root file system

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