When an x86 computer is booted, the processor looks at the end of the system memory for the BIOS ( basic input / output system ) and runs it. The BIOS program is written into permanent read-only memory and is always available for use. The BIOS provides the lowest level interface to peripheral devices and controls the first step of the boot process.
The BIOS tests the system and looks for and checks peripherals, and then looks for a drive to use to boot the system.
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Once Linux is installed on the hard drive of a system, the BIOS looks for a 'Master Boot Record' (MBR) starting at the first sector on the first hard drive, loads its contents into memory, then passes control to it.
This MBR contains instructions on how to load GRUB using a pre-selected operating system. The MBR then loads the boot-loader, which takes over the process ( if the boot loader is installed in the MBR ).
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Once GRUB has received the correct instructions for the operating system to start, either from its command line or configeration file, its finds the necessary boot file and hands off control of the machine to that operating system.
One question though, in GParted I see there is 100 gig under Extended. What is this? It's space that's unaccounted for as the other partitions make up the total size of my HD.
JackieRobinson wrote:And the extended partition technically doesn't exist as there's no hard disk space left for it to exist, yet it is there in Gparted and showing as mounted.
So it's a partition in a partition?
So if I understand you correctly my other partitions are within this extended partition?
sudo fdisk -l
sudo parted -l
And when it shows 600 GB of drives mounted it is in fact 500? (my hd is 500).
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