In Windows XP, you type the following command to fix the master boot record at the Recovery Console prompt: FIXMBR. Press the Enter key and then press Y and Enter to confirm. For all versions of Windows, this command works instantly. You see another command prompt displayed. Type exit to quit the command prompt. Restart the PC if it doesn’t restart automatically.
Quick Navigation:.A Master Boot Record (MBR) is a special type of boot sector which is located at the beginning of the partitioned computer storage devices such as internal hard disks, external hard disks, removable drives, and more. This concept was firstly publicly introduced in 1983 with PC DOS 2.0.The MBR holds the information on how the logical partitions, containing file systems, are organized on that storage medium. It also contains executable code to function as a loader for the installed operating system.The maximum addressable storage space of MBR partition table is 2TB ( 2^32×512 bytes ). Therefore, the MBR-based partitioning scheme is gradually being replaced by the GUID Partition Table ( GPT ) scheme.MBR cannot exist on non-partitioned media like floppies.When you get a new hard drive, you can use and its ' ' function to do this job. OverviewIn general, there are two kinds of definition for MBR. Broadly speaking, MBR contains the entire sector ( bootstrap, partition table and separation identifier ). While in a narrow sense, it only refers to bootstrap.Generally, the sector which contains loader code is Main Boot Record ( MBR ) because this loader code already occupies most of the free space.
Besides, formatting partition commands will not erase MBR information since this special space does not belong to any partitions.MBR Contains Three Parts (. Note: MBR does not belong to any operating system. Therefore, the disk command cannot read it. However, users can modify or rewrite it via commands. For example, in the minix 3, users can use the “installboot-m/dev/c/us/r/mdec/masterboot' command to write the master-boot program into MBR. Main Function and Boot Process of MBRBIOS will automatically check all hardware devices when users launch the PC. After that, the system bootstrapping will read the MBR from CHS to memory.
And then, it can execute the master boot record.Master boot record will check the hard disk partition table to see whether it is in good order, and to seek a bootable partition “ active ” in the partition table. Besides, it can help to store the contents of the first logical sector of the active partition into memory. And, the contents of the sector is called dos boot record ( DBR ). The Process of Reading MBRFirst, the BIOS program checks the system hardware, and then check available boot devices in accordance with the boot order set in CMOS. Next, BIOS reads the first sector namely MBR sector to 0000: 7C00H. Then, BIOS reads 0000: 7CFEH-0000 to see whether the end signature is 55AAH.
If it is, BIOS will pass control to MBR to load Windows. If not, BIOS will read other bootable devices. If there is no bootable device, we will receive the message “NO RAM BASIC”, and Windows cannot boot. Virtual MBRVirtual MBR refers to extended boot record ( EBR ), whose record entries are identical to MBR's. Rebuild MBRIn some case, mistaken operation or computer virus invasion may damage MBR.
As a result, when launching computer, users just see a black screen or see some nonsense letters. Aiming at this situation, they can turn to some solutions, like:DOS commands: fdisk /mbr. Facebook. Twitter. Linkedin. Reddit.
The MBR is corrupted in Windows 10Master Boot Record (MBR) belongs to boot record, along with Boot Configuration Data(BCD). MBR will be created when the first partition on the hard drive is created and it is a very important data structure on the first sector of disk, which contains the partition table for the drive as well as a small amount of executable code for the boot start.Once the MBR file is damaged or inaccessible, you may not be able to boot your system at all, anderror information as ', 'Error loadingoperating system', 'Missing operating system' or 'Invalidpartition table' will show up.
If you receive any of these errors, youneed to rebuild or repaircorrupted MBR in Windows 10/8/7 to fix the issues. Usually, the MBR problem might be caused by malware infection, or improper shutdown.
How to fix MBR in Windows 10 two ways included?You can realize 2 ways about how to fix corrupted MBR in Windows 10. If you can access Windows Recovery Console, you can choose the first one. If you can‘t access it or feel that the first way is a lit bit complicated, you can use. Solution 1: Rebuild MBR in Windows 10 via Command PromptWindows Recovery Console is a traditional way to repair corrupted MBR. Recovery is entirely possible if you can access the Recovery Console and you know which command to type for your version of Windows.1. Boot into System Recovery Options.
Launch “Command prompt”, then type the command bootrec.exe and “Enter” to see the options that are available for this tool. (There are four parameter available: /FixMbr, /FixBoot, /ScanOs and /RebuildBcd.
Each of them can help you solve different boot problems.)2. Execute /FixMbr in Windows 10 with Command Prompt. (/FixMbr allows the repair of a corrupted or damaged Master Boot Record. And you should use it when you meet one of these error messages: “Operating System not found', “Error loading operating system', “Missing operating system' or “Invalid partition table'.)Solution 2: Fix Windows 10 MBR with a free GUI toolAOMEI Partition Assistant Standard is a free and powerful GUI, you can use it to rebuild the corrupted MBR easily. Free download it on a working computer and follow the steps given below.
Secure DownloadStep 1. Install and launch AOMEI Partition Assistant Standard on a working PC. In the main interface, click Make Bootable Media in the left pane and follow the wizard to create a Windows 10 bootable USB drive.Step 2. Connect the bootable media created via AOMEI Partition Assistant Standard to the computer with a boot issue and enter BIOS to.Step 3. Once logged in, the AOMEI Partition Assistant Standard will run automatically. In the main interface, right-click the system disk that contains corrupted MBR and choose Rebuild MBR.Step 4.
Set the type of MBR for Windows 10 in the pop-up window. (Choose a proper MBR typeaccording to your operating system.)Step 5. Click Apply and Proceed on the toolbar to commit Rebuild MBR operation.Notes:.“Rebuild MBR” only can solve problems such as MBR code has been damaged. To dealwith OS unbootable problem which is caused by bootable file or system file missingis beyond its abilities.“Rebuild MBR” would not lead to any kind of data loss. However, improperly RebuildMBR might cause your computer unbootable. So, you’d better learn more relevantknowledge before you execute Rebuild MBR operation.This way of fixing MBR in Windows 10 can also be applied to repair MBR in Windows 7/8/8.1. If you want to experience more advanced functions, such as, allocating free space from D drive to C drive, you can upgrade to Professional version.