Linux Kernel in a nutshell (PDF ver.), chapter 7.
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“How can you determine whether you are using a ramdisk at boot time¹? In Chapter 5 we mention using the distribution installation script to install the kernel versus doing the installation on your own. If you are using the distribution installation script, you are probably using a ramdisk. If you are installing it on your own, you are probably not.”
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¹: also known as initramfs
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