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A modern PC is configured to attempt to boot from various devices in a certain order. If a computer is not booting from the device desired, such as the floppy drive, the user may have to enter the BIOS Setup function by pressing a special key when the computer is first turned on (such as Delete, F1, F2, F10 or F12), and then changing the boot order. [6]
On the original IBM PC and XT, if no bootable disk was found, the BIOS would try to start ROM BASIC with the interrupt call to interrupt 18h. Since few programs used BASIC in ROM, clone PC makers left it out; then a computer that failed to boot from a disk would display "No ROM BASIC" and halt (in response to interrupt 18h).
No Unix-like Anything Fedora Media Writer: The Fedora Project: GNU GPL v2: Yes No Linux, macOS, Windows Fedora: GNOME Disks: Gnome disks contributors GPL-2.0-or-later: Yes No Linux Anything LinuxLive USB Creator (LiLi) Thibaut Lauzière GNU GPL v3: No No Windows Linux remastersys: Tony Brijeski GNU GPL v2: No [2] No Debian, Linux Mint, Ubuntu ...
The computer first executes a relatively small program stored in the boot ROM, which is read-only memory (ROM, and later EEPROM, NOR flash) along with some needed data, to initialize hardware devices such as CPU, motherboard, memory, storage and other I/O devices, to access the nonvolatile device (usually block device, e.g., NAND flash) or ...
The boot loader is responsible for accessing the file system on the boot drive, starting ntoskrnl.exe, and loading boot-time device drivers into memory. Once all the boot and system drivers have been loaded, the kernel starts the session manager (smss.exe), which begins the login process. After the user has successfully logged into the machine ...
When debugging a concurrent and distributed system of systems, a bootloop (also written boot loop or boot-loop) is a diagnostic condition of an erroneous state that occurs on computing devices; when those devices repeatedly fail to complete the booting process and restart before a boot sequence is finished, a restart might prevent a user from ...
In these cases a computer can often be "redirected" to boot from a USB device through use of an initial bootable CD or floppy disk. [5] [6] [7] Some Intel-based Macintosh computers have limitations when booting from USB devices – while the Extensible Firmware Interface (EFI) firmware can recognize and boot from USB drives, it can do this only ...
On many Allwinner systems on a chip (A10, A20, A64), the boot ROM either waits for a bootloader to be loaded through USB (if a specific PIN is high) or tries to boot on several peripherals in a fixed order. [5] Some Allwinner systems on a chip can verify the signature of the booloaders. [6] But most devices being manufactured are not configured ...