Detailed analysis of DOS Startup Process

When the computer is started, some system programs must be read from a disk into the memory before it can work normally. We call this disk a boot disk.

Generally, disk A or disk C is used as the boot disk. In special cases, other drive letters of the hard disk and A few computer discs can also be used as the boot disk. To create a boot disk, run the sys command. See the command section below.

When the DOS system is started, you must first read two system file IO from the boot disk. SYS, MSDOS. SYS, search for and execute CONFIG in the root directory of the boot disk. SYS, COMMAND. COM, AUTOEXEC. BAT files. Among them, the IO. SYS, MSDOS. SYS, and COMMAND. COM files are indispensable; otherwise, the computer will not be able to start normally.

CONFIG. SYS and AUTOEXEC. BAT files are used to configure the system running environment and automatically execute some commands. They play a crucial role in the computer running performance and the drivers of many devices, we can modify their content as needed,

Autoexec. bat is called an automatic batch processing file. It is a type of batch processing file. Because it runs automatically at DOS Startup, it is called an automatic batch processing file. You can put the program you want to run every time you start the computer.

If the computer cannot find these two files in the root directory, it can also run, but there are a lot of complex software and equipment will not work properly. Such as optical drive, sound card, and Windows program. Therefore, Beginners should be careful not to delete the above several files; otherwise, the computer will not work properly.