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System Startup Process

Posted in Hard Drive Upgrade by manyu time 26 Dec Bookmark and Share

A variety of different operating system boot process are not the same, for example: Win9x/DOS startup process.
1: System Power On Self Test POST process. POST is the acronym for Power On Self Test, that is, the meaning of power-on self test, computer implementation of the memory FFFF0H Office programs (here is a piece of cured ROM program), the system’s hardware (including memory) to be checked.
2: Read record and partition boot record. When the computer checks the hardware properly and in line with the CMOS settings, follow the CMOS settings from the corresponding startup (we here assume to start from the hard disk), read the hard drive partition records (DPT) and the master boot record (MBR).
3: Read DOS boot record. Computer to read the correct record and master boot record partition, if the master boot record and partition table checksum is correct, then the implementation of the master boot record and further reads the DOS boot record (located in each of the first sector primary partition), then the implementation of The DOS boot record.
4: loading system for the hidden files. The DOS system files IO.SYS into the implicit memory, load the basic file system FAT, which usually occur when the Starting Windows 9x … a sign, IO.SYS will MS.SYS read into memory, and processing System. dat and User.dat files, load the disk-compression program.
5: real DOS mode configuration. The completion of the system load hidden files, computer will execute the system hidden files, and perform system configuration files (Config.sys), defined in a variety of Config.sys loads the driver.
6: transferred to the command interpreter (Command.com). System load command management procedures in order to command the system to coordinate the various operations management (we use the Dir, Copy and other internal command is provided by the Command.com).
7: implementation of the batch file (Autoexec.bat). Microcomputer will be step by step implementation of the batch file in the Order.
8: load Win.com. Win.com is responsible for a variety of Windows, drivers and start the implementation of the document to be implemented to complete the boot

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