Boot, the system is how to run the paper?

Boot, the system is how to run the paper?

When the system power through the self-test, the hard disk has been reset, BIOS will be based on The user specified in the order to start from the floppy disk, hard disk drive or start to carry out.To start from the hard disk, for example, the system BIOS master boot record will be read into memory.Then, control of the main guide to the process, and then check the status of the partition table, Search for regional activities.Finally, the program will be guided by the master control to guide the activities of the district records, guided by the record of the operating system to load.
For WIN9X and DOS operating systems, such as, the record will be guided by geographical Read and be responsible for the implementation of IO.sys (Windows9x the IO.sys).
Must first initialize a number of important data, and then we will be very familiar with the blue sky and white clouds.At this time, Windows will continue to carry out DOS And part of the GUI (graphical user interface) of the guidance and initialization work.If the system is equipped with the tools to guide a variety of operating systems software, usually master boot record will be replaced by the software code and guide.These codes will allow users to An operating system choice, and then read and implement the basic operating system code.
For WIN NT/2000, from NTLDR is in charge of this process into its memory, or allow users to choose non-WIN NT / 2000 operating system.Guided into multiple procedures and guidance by a hidden attribute to control Initialization boot.ini file.Boot.ini in includes control of the computer operating system settings can be used to guide the default operating system As well as how long it should wait for the information.
From the computer to guide the course of the description can be found, we can be man-made intervention, only two places, first set up the physical disk to guide the order, and the other is the main guide the process to amend the sub – District table.
(1) hard disk and more multi-system co-exist:If you used a computer hard drive is more, and each hard drive had a different operating system, the CMOS recommends that you specified in the order to start the hard disk, Multi-operating systems to coexist.Hubuyingxiang between the operating system as a result, so this method is not fully compatible, and other factors.
(2) a single hard disk system of co-existence:but only if you are a hard disk, And above would also like to install multiple operating systems and will not be affected with each other, then you must modify the main boot partition table and the methods to achieve.There are two ways.First, amend the master boot record, master boot record By the end of the JMP instruction to jump up their own code so as to guide the process control computer; another way is to amend the primary partition of the first sectors to guide the code in order to achieve co-existence of multiple systems.