What name of the GNU Project boot loader is short for GNU GRand Unified Bootloader?

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What is the reference implementation of the Free Software Foundation's Multiboot Specification?

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What Free Software Foundation spec provides a user the choice to boot one of multiple OSes installed on a computer or select a kernel configuration available on a particular operating system's partitions?

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What finds the primary bootable device (usually the computer's hard disk) and runs the initial bootstrap program from the master boot record (MBR)?

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What is the first sector of a hard disk and is where the initial bootstrap program has to fit?

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What program does the BIO run from the master boot record in the primary bootable device?

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What in BIOS-based systems has the duty to access the content of kernel files so it can be loaded into RAM and executed (the concept of a file system is unknown to the BIOS)?

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What is a program that boots an operating system by configuring it and starting the kernel?

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What was the limit on size of the hard disk sector where the master boot record was stored for a long time, until 2009?

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