Boot sector error take a default

boot sector error take a default

XP: Boot into the recovery console and use the fixmbr command. Use a 3rd party tool to fix the partition table. Win 7: press F8 during system startup and select. Boot Sector Errors · Invalid partition table · Couldn't find BOOTMGR · BOOTMGR is missing · Missing operating system · Setup has determined that your. This issue is caused by a missing boot.ini file. Resolution. To resolve this issue, recreate the boot.ini file: Locate the C:\.

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How to Fix Hard Drive Boot Missing or Boot Failed Error?

In this guide, you will learn everything about boot fail errors such as ‘Default Boot Device Missing.’ This general help guide will answer every problem related to boot errors and help you learn how to get back your important files from a PC that fails to boot.

Stellar® Data Recovery offers a complete range of data recovery option to recover deleted data according to different data loss scenarios. Choose the most
preferable data recovery option as per your need.

What is Boot Missing or Failed Error?

Usually, when you boot a Windows system, it displays Windows loading and startup screen. A Boot Missing or Boot Failed error is a Windows startup error that appears when a PC or laptop fails to find or load the Windows boot files. This occurs when something goes wrong with the system software or hardware. But often, it’s the corrupt and damaged boot sector or failed system drive.

Consequently, as Windows can’t boot, a user loses access to all their data.

What Are the Reasons for Boot Failed or Missing Error?

  1. Incorrect boot sequence
  2. Misconfigured, damaged, or corrupt BIOS
  3. Damaged or defective SATA cable/connector
  4. Insufficient power supply
  5. Unsupported or RAW format drive
  6. Missing boot files

How to Fix Boot Device Missing or Boot Failed Error?

Usually, the fix is easy. But in some cases, it can’t be fixed. Depending on the reason for the boot error, you may try following fixes and repair a non-bootable Windows PC.

1. Check Boot Order Sequence

  • Restart your PC
  • As it starts and manufacturers’ logo appears, immediately start pressing the F2 key to enter the BIOS setup

Check your laptop or system motherboard manufacturers’ site to confirm the key to enter BIOS setup as it varies for different PC and laptops, but usually its F2

  • In the BIOS setup, go to the Boot tab
  • Check and arrange the boot order. Make sure your PC’s hard drive is at the top. If it’s not, change the boot order
Fix Boot Device Missing Error

You may also change the boot mode from UEFI to Legacy and save the changes. Restart your system and check if the error is gone. If not, continue to follow the subsequent fixes.

2. Repair Windows Boot Sector

A system may fail due to damaged boot sector, which may occur due to system crash, force shutdown, virus or malware infection, etc.

But a damaged boot sector can be fixed by using a Windows installation or recovery media. You can create one by using any Windows PC.

Fix Boot Device Missing Error
  • Connect the Installer or recovery media to the system and restart the system
  • As the system boots, start pressing the boot option key, usually F12, and then move the selection by using arrow keys to the USB Installer/Recovery media
  • Press ‘Enter’ to boot and then follow these steps to fix the damaged boot sector that prevents Windows from loading,
    • Select language and click ‘Next.
    • Click Repair your computer
    • Select the operating system that you want to repair, and then click ‘Next.’
    • In the ‘System Recovery’ Options dialog box, click Command Prompt
    • Type these command, one at a time, followed by an ‘Enter’ keypress
      bootrec.exe /fixboot
      bootrec.exe /fixmbr  
Fix Boot Device Missing Error

This command should ideally fix issues related to ‘Bootmgr Is Missing,’ or ‘Boot Failed’ errors. If not, head to the next fix.

3. Inspect Hard Drive

Check your hard drive for firm connection and ensure its not overheating.

Fix Boot Device Missing Error
  • Disconnect the cable and then connect it again. If the SATA cable or power cable is damaged, replace it with the new
  • If that doesn’t resolve the issue, turn off the PC and disconnect the hard drive from the PC. Use SATA or SATA to USB converter cable to connect the affected storage media to a working Windows PC

TIP: Use a SMART Disk monitoring tool such as CrystalDiskInfo or Drive Monitor to get deeper insights about the disk health, temperature, and SMART data.

  • Check if the drive is accessible and backup data.
  • In case the drive is inaccessible, open Disk Management, tool and find if the drive is recognized. If the drive displays as RAW, it indicates corruption
Fix Boot Device Missing Error

In such a case, you can use a DIY data recovery software such as Stellar® Data Recovery. Follow the steps discussed in the next fix.

But if the data on the affected hard drive is critical or drive is physically damaged, you must immediately get in touch with a data recovery professional to get back data.

4. Restore and Backup Files

Connect the affected drive to a working Windows PC and then follow these steps,

  • Download, install and launch Stellar® Data Recovery software
  • Choose ‘All Data’ and then click ‘Next.
  • Choose the RAW drive volume under ‘Connected Drives’ and turn on ‘Deep Scan’ toggle switch
Fix Boot Device Missing Error
  • Click ‘Scan’
  • Post scan, explore, sort, and filter scan results and choose all the files you want to recover
Fix Boot Device Missing Error

TIP: You can click on a file to see its preview before saving

  • Click ‘Recover’ and then click ‘Browse.’
  • Choose a save location other than the affected drive and click ‘Start Saving.’

That’s it. The software will save all the selected files at your desired location.

5. Format or Replace Disk

Now that you have access to your data, you can go ahead format the drive and reinstall Windows from scratch. After the installation, transfer your recovered files to your fixed PC.

In case hard drive, health is poor, or drive is affected by SMART errors and bad sectors, replace it with a brand new or healthy hard disk drive.

And to avoid such data loss situations, ensure a regular backup. Maintain at least two backup copies of all your important files

6. Professional Hard Drive Data Recovery Service by Stellar® Data Recovery

Data recovery software works when drive suffers from logical damage such as file system errors, corruption, accidental deletion, and formatting. But if the data is critical or when the software fails to get back desired files from the storage media, you must immediately reach out to a data recovery service expert.

A data recovery service expert at Stellar® can help get back data from all kinds of storage media devices such as hard drive, SSD, thumb drives, memory cards, etc. that is physically damaged or failed due to mechanical and electrical errors.

Well-trained and experienced data recovery experts carry out data recovery from physically damaged storage media in Stellar’s® ISO certified state-of-the-art Class 100 Clean Room facility.

All you need to do is submit the storage media, post which Stellar® experts diagnose the storage device and then consult with you about the probability of data recovery and data recovery cost. Once approval of quotation and time estimate is confirmed from your end, Stellar® experts proceed with data recovery by using proprietary tools, innovative techniques, and a huge inventory of resources.

And don’t worry about data theft or leakage. Stellar® is an ISO 9001 & ISO 27001 certified organization. From spare transplantation to cloning followed by data verification and delivery, everything is done with utmost care for your data privacy.

Also Read: How to Fix The Error “Disk Boot Failure Insert System Disk And Press Enter

Special Offer from Stellar

Get exclusive offer on stellar data recovery service, drop email to [email protected]

Quick Tips to Prevent Boot Missing and Boot failed Errors

  1. Regularly check and optimize your system hard drive
  2. Ensure adequate ventilation and gap between the hard disk and other components in your PC to avoid overheating
  3. Run CHKDSK scan once in a while to keep track of bad sectors and fix minor disk errors before they lead to drive corruption or failure
  4. Keep BIOS, Windows, and antivirus protection updated
  5. Be careful while using Disk Management or any third-party partition manager tool. Never touch the boot partition while using such tools
  6. Actively monitor critical disk health parameters, such as temperature and SMART data. You can automate this task by using add-on utilities such as Drive Monitor that comes with Stellar® Data Recovery software
Prevent Boot Missing Error
Prevent Boot Missing Error

Final Thoughts

When Windows fails to boot, the system displays boot error messages such as ‘Default Boot Device Missing’ or ‘Bootmgr Is Missing.’ In most cases, the error can be easily resolved. But in some, it can’t, and thus, you need to be more careful while trying and applying various fixes on the system as they may lead to further damage to the disk or the data contained on the disk.

If the error can’t be resolved with the troubleshooting’s steps and drive is inaccessible, leverage a powerful DIY data recovery solution such as Stellar® Data Recovery.

But if data is critical, it’s better to get the help of a professional data recovery expert. Moreover, the software can help when drive suffers logical errors. For a physically damaged drive, you need the help of a data recovery expert such as Stellar®. You can call them any time 25*6 on their toll-free number and avail their world-class data recovery services with 100% privacy.


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Using Windows Boot Manager to Fix Startup Errors on Windows

Windows PCs may sometimes encounter issues during startup, and that can happen when Windows fails to load properly. In this post, we’ll explain how you can use Windows Boot Manager to troubleshoot boot errors and get your PC up and running again.

Table of Contents

What is Windows Boot Manager?

Windows Boot Manager (Bootmgr.exe) is Microsoft’s proprietary Unified Extensible Firmware Interface (UEFI) application. It is loaded from the volume boot code of your device’s hard drive, and it enables you to set up the boot environment, i.e. what happens when you first turn on your device.

Windows Boot manager also lets you choose a specific operating system to load if your system contains multiple operating systems. It can also provide access to several boot applications before loading Windows, which let you update, reset, or format your device. These applications can also help you flash the device with a new OS image and to capture and save crash dumps along with the associated logs to better understand any Windows issues.

Understanding the boot process

To boot a computer means to initiate the process of starting it. In any computing device, all the essential files, the operating system, its associated libraries and dependencies, along with system-critical data are stored on a hard disk drive. However, when you turn on your computer, these files need to be loaded into memory (RAM) and executed for the OS to load. 

Chart explaining the boot process

Here are the four major phases involved in the boot process:

Phase 1 – PreBoot

In this phase, the computer’s firmware settings are loaded through a power-on self test (POST) process. Once this process is completed, the system identifies a valid disk and reads the Master Boot Record (MBR) from it, and the Windows Boot Manager is loaded.

Phase 2 – Windows Boot Manager

In this phase, Windows Boot Manager starts the Windows OS Loader (WinLoad.exe). It lets you choose the operating system to load on the PC.

Phase 3 – Windows OS Loader

Once an OS has been selected, the Windows OS Loader loads the necessary drivers to talk to the hardware needed to start the Windows kernel. 

Phase 4 – Windows NT OS Kernel

This is the last phase in the boot process: Additional drivers are loaded and the Windows registry settings are read and pass control to the Session Manager Subsystem (Smss.exe). Which in turn, loads the user interface (UI) along with the rest of the hardware and software. 

How to access Windows Boot Manager

In most computers, the Windows Boot Manager can be accessed by pressing the ‘F8’ key as soon as your computer starts. Alternatively, you can also access the app by following the steps below:

  • Open the Settings app from the Start menu.
  • Click Update & Security.
  • Click Recovery from the menu on the left side of the window.
  • Click Restart Now under the Advanced Startup options.
We can restart our PC from the Settings app to access the Windows Boot Manager

The computer will restart and load Windows Boot Manager.

Enabling and disabling Windows Boot Manager

While Windows Boot Manager gives you the ability to choose which OS to boot on your machine, it also slows down the boot process. Therefore, disabling the app can be a viable option to speed up the boot process. 

To enable or disable the Windows Boot Manager via the GUI, follow the steps below:

  • Press Windows + R and type ‘systempropertiesadvanced’ and press Enter to load the System Properties menu.
  • Under the Startup and Recovery section, click Settings.
  • To enable Windows Boot Manager, check the box before Time to display list of operating systems options
  • To disable Windows Boot Manager, uncheck the box before Time to display list of operating systems options
It's possible to disable Windows Boot Manager to speed up the boot process.
  • Press OK to apply the changes

Note: You can also enable/disable the Windows Boot Manager and change boot manager options via the command line. 

Most common problems during the Boot Loader phase       

While several issues could hinder the Windows boot process, it’s easy to identify problems with the error codes indicating what went wrong. If your screen turns black when the device boots with a blinking cursor, it indicates that the boot process is stuck in the Windows Boot Loader phase.

The device can be in the same state if you encounter one of the following error codes during the Boot Loader phase: 

  • Boot file or MBR (Master Boot Record) corrupted. 
  • Boot sector missing or corrupted.
  • Boot configuration data (BCD) missing or corrupted. 
  • Bootmgr missing or corrupted.

Below are some of the most commonly used and effective ways to solve problems that can occur in the Boot Loader phase. 

Using the Startup Repair tool to repair the Boot Loader

The Startup Repair tool is the first resource that can help you fix boot loader issues. This tool analyzes startup log files to determine the cause of the problem. And it can also help you diagnose and repair many other startup issues.

To use the Startup Repair tool, boot your device from a disk or USB flash drive using Windows installation media: To do this, connect your installation media to your PC, turn on your PC, and press the key that opens the booting device selection menu. Depending on the manufacturer, this could be either Esc, F10, F12, or another key.

  • On the Install screen of the installation media, select Next  > Repair your computer 
  • Next, click Troubleshoot on the Choose an option screen.
  • Now, select the Startup Repair option from the Advanced options screen.
We access the Startup Repair tool from the Windows Recovery environment
  • Once the Startup Repair tool has run the process to repair the Boot Loader, select Shutdown and turn your PC back on to see if the problem is resolved.

The Startup Repair tool also generates a log file that lists out every process, process execution, problems that occurred during the startup process, as well as the fixes that have been implemented. The log file can be found in the location below:


How to use Windows Boot Manager to fix Windows 10 boot errors

If using the Startup Repair tool wasn’t enough to fix your startup problems, we’ll now go through some other troubleshooting methods you can try on your device.

Repairing the master boot code and boot sector

When you turn on a PC, the BIOS or UEFI handles the initial power-on routine. It then loads the master boot code into the PC’s main memory (RAM). The master boot code then scans the disk’s partition table to identify the active partition that needs to be loaded.

The part of the disk that contains the master boot code is called the boot sector. If there are any errors or corrupted data in this area of the disk, the device may fail to load Windows. 

To repair the master boot code, you can use the bootrec.exe tool in a command prompt. Again, you may need to use installation media to boot Windows 10 in recovery mode, then click on Advanced options > Troubleshoot > Advanced options > Command prompt.

Once in a command prompt, use the following command:

Bootrec /fixmbr

This command writes a new master boot code to the system partition, which can help to resolve MBR corruption issues. However, the /fixmbr switch does not overwrite the existing partition table. If the latter is corrupted, overwriting the master boot code may not fix the issue.

To repair the boot sector, you can run the /fixboot command with bootrec.exe in a command prompt. This command will write a new boot sector to the system partition.

Bootrec /fixboot
running the /fixmbr and /fixboot commands.

Fixing Boot Configuration Data (BCD) errors

Boot Configuration Data (BCD) errors are also some of the most common types of boot issues on Windows. There are several different causes for BCD-related startup errors, including unexpected shutdowns, data corruption, malicious software, or failing hard drives. 

A Boot Configuration Data (BCD) error message

To fix BCD errors, the first step you need to follow is to use the /ScanOS switch to perform a system-wide scan of all disks. This command will also help you see if there are Windows installations that Boot Manager doesn’t list:

Bootrec /ScanOS

After running this command, try restarting the computer to see if the problem is fixed. If that’s not the case, you can rebuild the BCD store with the /RebuildBcd switch.

The following commands will export and delete the BCD store, then rebuild it from scratch.

bcdedit /export c:\bcdbackupattrib c:\boot\bcd -r -s -hren c:\boot\bcd bcd.oldbootrec /rebuildbcd/

Restart your PC when you’re done running these four commands, and check if you can now boot into Windows normally.

Replace the Bootmgr file

If none of the above methods fixed the issue, you can try replacing the Bootmgr file from C: drive to the System Reserved Partition (SRP), which is a small partition on your hard drive that stores boot information for Windows.

By default, the System Reserved Partition is not assigned any drive letters. To assign it with any letter like ‘R’, use the PowerShell command below at a command prompt:

Get-Partition -DiskNumber 0 -PartitionNumber 1 Registered Office: 205, Skipper Corner, 88, Nehru Place, New Delhi - 110019, Email: [email protected]

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boot sector error take a default


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