Fix Non-System Disk or Disk Error Message

Fix Non-System Disk or Disk Error Message: If you are facing the Non-System Disk or Disk Error Message on Startup i.e. when the PC boots up then you are the right place as today we are going to discuss how to resolve this error. It basically means that your operating system is not accessible and you won’t be able to boot to your Windows. The only option you have is to restart your PC and again you will be presented with this error. You would be stuck in an infinite loop until this error is resolved.

Fix Non-System Disk or Disk Error Message on Boot

The error indicates that the boot files or BCD information might have got corrupted, hence you won’t be able to boot. Sometimes the main issue is boot order is changes and system can’t find the correct files to load your OS. Another silly problem which can cause this error is loose of faulty SATA/IDE cable that connects your hard disk to the motherboard. Well, as you see there are various issue because of which you could face this error, therefore, we need to discuss all the possible solutions in order to fix this issue. So without wasting any time let’s see how to actually Fix Non-System Disk or Disk Error Message on Boot with the help of below-listed troubleshooting guide.

Fix Non-System Disk or Disk Error Message

Note: Make sure to remove any bootable CDs, DVDs or USB Flash drive attached to the PC before following the below-listed methods.

Method 1: Set Correct Boot Order

You may be seeing the error “Non-System Disk or Disk Error Message on Startup” because the boot order was not properly set, which means that computer is trying to boot from another source which doesn’t have an operating system thus failing to do so. In order to fix this issue, you need to set the Hard Disk as the top priority in the Boot order. Let’s see how to set proper boot order:

1.When your computer starts (Before the boot screen or the error screen), repeatedly press Delete or F1 or F2 key (Depending upon your computer’s manufacturer) to enter BIOS setup.

press DEL or F2 key to enter BIOS Setup

2.Once you are in BIOS setup select Boot tab from the list of options.

Boot Order is set to Hard Drive

3.Now make sure that the computer Hard disk or SSD is set as a top priority in the Boot order. If not then use up or down arrow keys to set hard disk at the top which means the computer will first boot from it rather than any other source.

4.Finally, press F10 to save this change and exit. This must have Fix Non-System Disk or Disk Error Message, if not then continue.

Method 2: Check on your Hard Disk IDE or SATA cable

In most of the cases, this error occurs because of the faulty or loose connection of hard disk and to make sure that this is not the case here you need to check your PC for any type of fault in the connection.

Important: It is not recommended to open the casing of your PC if it’s under warranty as it will void your warranty, a better approach, in this case, will be taking your PC to the service center. Also, if you don’t have any technical knowledge then don’t mess with the PC and make sure to look for an expert technician which can help you in checking for faulty or loose connection of hard disk.

Check if Computer Hard Disk is properly connected

Once you have checked the proper connection of hard disk is established, reboot your PC and this time you may be able to Fix Non-System Disk or Disk Error Message.

Method 3: Run Startup/Automatic Repair

1.Insert the Windows 10 bootable installation DVD or Recovery Disc and restart your PC.

2.When prompted to Press any key to boot from CD or DVD, press any key to continue.

Press any key to boot from CD or DVD

3.Select your language preferences, and click Next. Click Repair your computer in the bottom-left.

Repair your computer

4.On choose an option screen, click Troubleshoot.

Choose an option at windows 10 automatic startup repair

5.On Troubleshoot screen, click Advanced option.

select advanced option from troubleshoot screen

6.On the Advanced options screen, click Automatic Repair or Startup Repair.

run automatic repair

7.Wait til the Windows Automatic/Startup Repairs complete.

8.Restart and you have successfully Fix Non-System Disk or Disk Error Message while booting, if not, continue.

Also, read How to fix Automatic Repair couldn’t repair your PC.

Method 4: Repair or Rebuild BCD Configuration

1.Using above method open command prompt using Windows installation disk.

Command prompt from advanced options

2.Now type the following commands one by one and hit enter after each one:

a) bootrec.exe /FixMbr
b) bootrec.exe /FixBoot
c) bootrec.exe /RebuildBcd

bootrec rebuildbcd fixmbr fixboot

3.If the above command fails then enter the following commands in cmd:

bcdedit /export C:\BCD_Backup
cd boot
attrib bcd -s -h -r
ren c:\boot\bcd bcd.old
bootrec /RebuildBcd

bcdedit backup then rebuild bcd bootrec

4.Finally, exit the cmd and restart your Windows.

5.This method seems to Fix Non-System Disk or Disk Error Message on Startup but if it doesn’t work for you then continue.

Method 5: Hard Disk might be failing or damaged

If you are still not able to Fix Non-System Disk or Disk Error Message then chances are your hard disk might be failing. In this case, you need to replace your previous HDD or SSD with a new one and install Windows again. But before running to any conclusion, you must run a Diagnostic tool to check if you really need to replace the Hard Disk or not.

Run Diagnostic at startup to check if the Hard disk is failing

To run Diagnostics restart your PC and as the computer starts (before the boot screen), press F12 key and when the Boot menu appears, highlight the Boot to Utility Partition option or the Diagnostics option and press enter to start the Diagnostics. This will automatically check all the hardware of your system and will report back if any issue is found.

Method 6: Change the Active Partition in Windows

1.Again go to Command Prompt and type: diskpart


2.Now type these commands in Diskpart: (don’t type DISKPART)

DISKPART> select disk 1
DISKPART> select partition 1
DISKPART> active

mark active partion diskpart

Note: Always mark the System Reserved Partition (generally 100mb) active and if you don’t have a System Reserved Partition then mark C: Drive as the active partition.

3.Restart to apply changes and see if the method worked.

Method 7: Run Memtest86+

Note: Before starting, make sure you have access to another PC as you will need to download and burn Memtest86+ to the disc or USB flash drive.

1.Connect a USB flash drive to your system.

2.Download and install Windows Memtest86 Auto-installer for USB Key.

3.Right-click on the image file which you just downloaded and select “Extract here” option.

4.Once extracted, open the folder and run the Memtest86+ USB Installer.

5.Choose your plugged in USB drive to burn the MemTest86 software (This will format your USB drive).

memtest86 usb installer tool

6.Once the above process is finished, insert the USB to the PC which is giving the Non-System Disk or Disk Error Message on Startup.

7.Restart your PC and make sure that boot from the USB flash drive is selected.

8.Memtest86 will begin testing for memory corruption in your system.


9.If you have passed all the test then you can be sure that your memory is working correctly.

10.If some of the steps were unsuccessful then Memtest86 will find memory corruption which means that your Non-System Disk or Disk Error Message on Startup is because of bad/corrupt memory.

11.In order to Fix Non-System Disk or Disk Error Message on Startup, you will need to replace your RAM if bad memory sectors are found.

Method 8: Change SATA configuration

1.Turn off your laptop, then turn it on and simultaneously press F2, DEL or F12 (depending on your manufacturer)
to enter into BIOS setup.

press DEL or F2 key to enter BIOS Setup

2.Search for the setting called SATA configuration.

3.Click Configure SATA as and change it to AHCI mode.

Set SATA configurationto AHCI mode

4.Finally, press F10 to save this change and exit.

Method 9: Repair Install Windows 10

If none of the above solutions work for you then you can be sure that your hard disk is fine but you may be seeing the error “Non-System Disk or Disk Error Message on Boot” because the operating system or the BCD information on the hard disk was somehow erased. Well, in this case, you can try to Repair install Windows but if this also fails then the only solution left is to Install a new copy of Windows (Clean Install).

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That’s it you have successfully Fix Non-System Disk or Disk Error Message but if you still have any questions regarding this post then feel free to ask them in the comment’s section.

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