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Some virtual machine infrastructure can directly import and export a boot image for direct installation to "bare metal", i.e. a disk. This is the standard technique for OEMs to install identical copies of an operating system on many identical machines: The boot image is created as a virtual machine and then exported, or created on one disk and then copied via a boot image control ...
The System Deployment Image (SDI) file format is often used to allow the use of a virtual disk for startup or booting. Some versions of Microsoft Windows allow for "RAM booting", which is essentially the ability to load an SDI file into memory and then boot from it.
WIM images can be made bootable and Windows boot loader supports booting Windows from a WIM file. Windows Setup DVD in Windows Vista and later use such WIM files. In this case, BOOT.WIM contains a bootable version of Windows PE from which the installation is performed. Other setup files are held in the INSTALL.WIM.
A USB image is easier to carry, can be stored more safely than a conventional CD or DVD. Drawbacks are that some older devices may not support USB booting and that the USB storage devices lifespan might be shortened. Ubuntu has included a utility for installing an operating system image file to a USB flash drive since version 9.10. [1]
Many distributions use dracut to generate and maintain the initramfs image. The root file system is later switched via a call to pivot_root() which unmounts the temporary root file system and replaces it with the use of the real one, once the latter is accessible. [14] The memory used by the temporary root file system is then reclaimed.
When GRUB is installed on a hard disk, boot.img is written into the boot sector of that hard disk. boot.img has a size of only 446 bytes. A boot sector is the sector of a persistent data storage device (e.g., hard disk , floppy disk , optical disc , etc.) which contains machine code to be loaded into random-access memory (RAM) and then executed ...
DL values of 0x00 and 0x01 may also be used by Protected Area Run Time Interface Extension Services (PARTIES) and Trusted Computing Group (TCG) BIOS extensions in Trusted mode to access otherwise invisible PARTIES partitions, disk image files located via the Boot Engineering Extension Record (BEER) in the last physical sector of a hard disk's ...
Network Bootable Image (NBI) is a legacy format that wraps operating system images to makes it possible for Etherboot to load the images directly. NBI format is able to combine kernel, file system and various boot parameters, such as location of remote file system or server IP address, into one bootable file.