initrd and initramfs

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What is an init ram?

https://en.wikipedia.org/wiki/Initrd
https://en.wikipedia.org/wiki/Initramfs

When to use an init ram?

The ram disk does not require much hardware support. Hardware support can be provided by linux kernel modules. The ram disk allows to have the same linux kernel available for different systems with different hardware.

How to use an init ram?

See also

https://wiki.archlinux.org/index.php/Initramfs