Initial RAM disk image ( initrd )
Once the second stage boot loader has determined which kernel to boot, it locates the corresponding kernel binary in the /boot/ directory. The proper binary is the /boot/vmlinuz-2.6.x-xx file that corresponds to the boot loader’s settings.
Next the boot loader places the appropriate initial RAM disk image, called an initrd, into memory. The initrd is used by the kernel to load any drivers not compiled into it that are necessary to boot the system. This is particularly important if you have SCSI hard drives or are using the ext3 file system.
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