What is MBR? What is MBR in a computer?

MBR is a hidden command whose function is to unconditionally rewrite the main boot and partition tables on the hard disk without initializing the DoS boot sector, file allocation table, and directory area. In other words, after fdisk MBR is executed, the bootloader and partition table can be rebuilt without destroying the original data information on the hard disk. It can also remove viruses from hard drives that are simply infected with embedded boot zone viruses.

MBR: The first piece of boot on the disk.

I know that format mbr is a algebraic partitioned table. Then MBR should stand for partition table! sys a:

C: Yes, the transmission system, sometimes the dual system will have the word win xp in the boot menu after deleting the xp with sys a: c:

Command the system and you can go directly to the system!

MBR Command ???

MBR is an abbreviation for Master Boot Record!

Judging from your previous question, it should be the meaning of the fdisk mbr command!

This command is used to rewrite the boot record of the hard disk and can be used to repair hard disks that are similar to those damaged by viruses (e.g. CIH virus).

Sys A: C: means to transfer the system files of disk A to disk C, for example, after starting the machine with the 98 boot disk, enter SYS A:C: under DOS to solve some problems of system file loss.

MBR command: I think you should be talking about the fixmbr command, right? This is a command used to fix partition errors after using the 2000 or XP system boot disc into the faulty console.

MBR is an abbreviation for Master Boot Record!

Sys A: C: means to transfer the system files from drive A to drive C.

MBR (master boot record, another term is main boot record), Chinese means main boot area record.

The first sector of the 0 track of the hard disk is called MBR, and its size is 512 bytes, and this area can be divided into three parts. The first part is the pre-boot area, which occupies 446 bytes. The second part is the partition table, which occupies 64 bytes, and the number of partitions on the hard disk and the size of each partition are recorded in it. The third part is the magic number, which occupies 2 bytes and is fixed at 55AA.

It does not belong to any operating system, nor can it be read by the disk operation command provided by the operating system, but it can be modified and rewritten by commands, such as in minix3, you can use the command: installboot -m dev c0d0 usr mdec masterboot to write the small program masterboot into mbr, masterboot is usually written in the huiwen language. We can also use the number 2 function of the int13h provided in the ROM-BIOS to read the contents of this sector, or we can use the software tool to read it.

Abbre [Master Boot Record] is an abbreviation.

1. MBR, that is, the master boot record.

2. When partitioning the hard disk or removable disk of a compatible machine, a boot sector at the front of the drive.

3. The MBR concept came into existence in 1983 after PC DOS supported hard disks. The MBR describes the information of a logical partition, including the file system and how it is organized.

4. The MBR also contains an executable ** or boot record (VBR) of the computer loading the operating system in the second phase of booting or connecting to each partition. This MBR** is often referred to as the bootloader.

5. The maximum addressable storage space of the MBR partition table is only 2TB (232 512 bytes). Therefore, with the advent of large hard disks, the MBR partitioning method is gradually replaced by tables. MBR cannot exist in a non-partitionable medium.

It is a one-click restore file, which is used to rebuild the MBR and rebuild the computer boot, which is the system boot (whether it is a single system or a multi-system);

The physical first hard disk is called the Master Boot Record;

That is: MBR (Main Boot Record), after modifying the MBR virus or program to move the original MBR to other sectors, especially some troublesome MBR viruses, when the MBR is forcibly used, the computer will not boot, because the normal boot and file structure of the computer are currently booted by the virus program;

Rebuilding the MBR is for this situation, and some system bugs may also cause MBR damage, the specific situation is too complicated, the landlord should rebuild the MBR will be the system to recover relatively clean.

main boot record.

To put it simply, you turn on the power, first have the BIOS program on the motherboard boot hardware initialization, and then hand it over to the system (such as XP 2000 Linux, etc.) to boot, and this bootloader of the system is in the first 512 bytes (it seems, or 1024) on the first sector of the first partition of the MBR - hard disk, and the common command is fdisk mbr can fix the win boot.

If it is in a computer, then it generally refers to the master boot record, that is, the Chinese master boot record.

It contains information such as bootstrapping, partitioning tables, etc.

MBR: The first piece of boot on the disk.

Hard drive partition table, if there is an error in the hard disk partition table, your system will not boot. You won't be able to find your drive letter, and your data will be lost.

The MBR records whether your system boot boot partition is a C drive or a D drive, how many areas the hard disk is divided into, the size, format, and other information of each partition.

So remember to back up your mbr

The master boot record of the hard disk does not belong to any system, and cannot be extracted by the disk operation commands provided by any operating system, but can be modified and overridden by commands.

MBR, which means Master Boot Record. It is a section of the loader located at the very front of the disk. It is responsible for determining the legitimacy of partitions and locating partition boot information when the disk operating system (DOS) reads and writes disks, and it is generated by the disk operating system (DOS) when the disk is initialized by the disk operating system (DOS).

Power on Self Test --post. The BIOS executes the redirect instruction at FFFF:0000H to the self-test program solidified in the ROM to check the system hardware (including memory).

2.Read the Master Boot Record (MBR). When the BIOS checks that the hardware is OK and matches the settings in CMOS, it detects the available boot devices in the order in which they are set in CMOS.

3.Check 0000:7cfeh-0000:

7cffh (the end flag of the MBR) is equal to 55AAH, if not, go to try other boot devices, if no boot device meets the requirements, it will display "No ROM Basic" and then crash.

4.When it detects that a boot device meets the requirements, the BIOS hands over control to the boot device. The MBR that boots the device copies itself to 0000:0600h and then continues.

5.Start the bootloader according to the boot ** in the MBR.

In fact, the BIOS not only checks whether 0000:7CFEH-0000:7CFHH (the end flag of MBR) is equal to 55AAH, but also often checks whether the disk is write-protected, whether there is an active partition in the main boot sector, and so on.

If the disk is found to be write-protected, a write-protection error message is displayed. If no active partition is found on the disk, a message similar to the following is displayed: "Remove disk or other media press any key to restart".

On the computer is the main bootloader.

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MBR: The first piece of boot on the disk.