Extracting the term presumably everyone will have a headache, because it is quite professional, not common in life, and will encounter these things in the process of setting up the USB flash drive, in order to facilitate everyone to quickly know the specific meaning, below Introduce a few common ones and hope to help everyone. BIOS (Basic Input/Output System) basic input and output system, the full name is ROM-BIOS, is a shorthand for the basic input /output system of read-only memory, it is actually a group is solidified into the computer, providing the computer with the lowest level of the most direct Hardware controlled program. CMOS (Complementary Metal Oxide Semiconductor) is intended to mean a complementary metal oxide semiconductor, a material used in large-scale production of integrated circuit chips. In the computer field, CMOS often refers to saving basic computer startup information (such as date, time, startup settings, etc.). ) The chip. The power consumption of CMOS is very low. A button battery on the computer motherboard can provide power for a long time. Even if the system is powered off, the information will not be lost. When the motherboard battery power is insufficient, the CMOS information will be lost. At this time, there will be some special phenomena when starting the machine. For example, if the CMOS parameter is lost during startup, it needs to be reset. Even the black screen of the machine cannot be started. Replace the button battery on the motherboard to recover. normal. Sometimes people will mix CMOS and BIOS. In fact, CMOS is a readable and writable RAM chip on the motherboard. It is used to save the BIOS hardware configuration and user settings for certain parameters. The setting of various parameters in CMOS has to pass a special program. Now most manufacturers have made the CMOS setting program into the BIOS chip. When the power is turned on, the CMOS setting program can be accessed by pressing a specific key, which is very convenient. The system is set up, so this CMOS setup is often called a BIOS setup. ESCD (Extended System Configuration Data) extends system configuration data. ESCD is a means used by the system BIOS to exchange hardware configuration information with the operating system. This data is stored in CMOS (a small piece of special RAM, which is powered by the battery on the motherboard). Among the power supplies, ESCD data is usually updated only after the system hardware configuration changes. Sector The smallest unit of hard disk partitioning. One sector is fixed at 512 bytes. MBR (master boot record) is the master boot record, sometimes called the master boot sector. Located in the 0 sector of the entire hard disk (0 to 62 of the hard disk, that is, the first 63 sectors are reserved sectors, currently only the first or the first few sectors occupied by the MBR), can be regarded as the first hard disk The sector usually only occupies this sector. For example, the MBR of XP, grub4dos occupies a total of 18 sectors from 0 to 17. DBR (DOS boot record) is the operating system boot record area, also known as the partition's main boot code, located in the 0th sector of the partition, usually only occupying this sector, in special cases also occupy other reserved sectors, and grub4dos It is written to the hard disk MBR mode does not modify or use DBR, the number ending in H or beginning with 0x indicates that the number is a hexadecimal number.