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Fedora LinuxHow Does It Work? An ISO image file is an exact copy of the contents of an optical disk. The name comes from the fact that data on optical discs is stored using a standard known as ISO 9660 . Each type of boot media has a unique standard for specifying how boot data is stored. On optical discs, the El Torito standard permits the system BIOS to find the boot software. For USB disks, a standard hard disk boot sector is used. For PXE network booting, a boot protocol (bootp) server is used to identify the boot files, and a trivial file transfer protocol (TFTP) server is used to serve them to the client system. The first piece of software that loads from the boot media is the bootloader: isolinux for optical discs, syslinux for USB flash drives, or pxelinux for PXE boot servers. After accepting boot parameters from the user, the bootloader subsequently loads two files: vmlinuz A compressed Linux kernel; the heart of the Fedora Core operating system. initrd.img A filesystem image that is loaded into memory and used as a ramdisk ...» |
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