Computers will not boot when the MBR is broken. MBR could be damaged due to various attack, mistaken operation, or sudden power failure. Once MBR is damaged, users may encounter boot problems such as MBR error 3 and see Windows black screen as follow:
- Error loading operating system
- Operating System not found
- Invalid partition table
- Missing Operating System
- No bootable medium found! System halted
- Reboot and select proper boot device
To Solve these problems, you need to use bootable partition manager, which can boot computer and perform partitioning operations like fix MBR without loading Windows OS. MiniTool Partition Wizard is highly recommended since it comes with the bootable media builder and brings no damage to data.
How to Fix MBR Windows 10/8/7 Without CD
Step 1. Download, install, and click the Bootable Media icon on the top right to run MiniTool Bootable Media Builder.
Step 2. Boot the computer from the bootable media
1. Create bootable media (CD/DVD/USB drive).
2. Boot the computer from the MiniTool bootable media.
Step 3. Repair MBR: Select the system disk which is suffering MBR damage and click “Rebuild MBR”.
Step 4. Click "Apply" to start fixing MBR.
After the application is completed, please shut down the program, take out bootable disk, and boot computer from local disk. Then, Windows should be bootable again.
Features of MiniTool Partition Wizard 12
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Fix MBR
Computers will not boot when the MBR is broken, Fix MBR on Windows 10/8/7 Without Installation CD, DVD or USB Disk.
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Recover Lost Partition
Recover lost partitions due to wrong deletion, wrong diskpart clean, virus infection, system upgrade and more.
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Repair/Fix RAW Drive
Once your disk becomes RAW, you are not allowed to access the target partition. Repair/Fix RAW Drive Without Data Loss for Windows 10/8/7/External Hard Drive.
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Convert Dynamic Disk to Basic
Convert dynamic disk to basic disk to support full Windows OS, and to install Windows on other partitions.
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Convert File System
Convert NTFS to FAT or convert FAT to NTFS without formatting to support early Windows OS or to store large files.
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Bootable Media Builder
Enable to create bootable CD/DVD, bootable USB flash drive, or build an .iso image of a bootable disc.
Supported operating systems
- Windows 10
- Windows Vista
- Windows 8
- Windows 7
Supported file systems
- FAT12/16/32
- NTFS
- Ext2/3/4
- exFAT
Supported Storage Devices
- Support UEFI/EFI boot.
- Support MBR disk and GPT disk.
- All storage devices recognized by Windows, such as RAID, etc.
- Traditional hard disk drives, solid-state drives (SSD), SSHD, etc.
- External hard drives, USB drives, SD cards, and other removable media.
