How Can I Solve Non System Disk or Disk Error, I Need Help

I recently got a problem and it almost drove me crazy. I replaced HDD with SSD in many computers, and since then, I have always gotten 'Non-system disk or disk error,' which affected my daily work a lot. Please assist me in solving this issue.

Best Answered by

Sherly· Answered on Apr 18, 2024

If the system is expecting UEFI and you have provided the Legacy/BIOS, you receive that error. Or if the system is expecting BIOS, you will receive this error if you provide UEFI. Hence, you need to convert MBR to GPT or GPT to MBR. The detail is as follows:


If you are confused and don't know which one to choose, the following details can help:

GPT: it allows users to create 128 primary partitions, and each one can be larger than 2TB.

MBR: It only allows users to create four primary partitions, and each one can't be larger than 2TB.

So you can choose MBR or GPT if your partition is smaller than 2T and choose GPT only if the partition is larger than 2TB. After figuring out which one to choose, you can start to convert. As for this point, I strongly recommend you choose a trustworthy too, such as EaseUS Partition Master.

Free Download 

Windows 11/10/8/7100% Secure

This tool is an all-in-one disk utility with a clear interface. Next, I'll show you how to use it to convert MBR to GPT:

Step 1. Click open EaseUS Partition Master and navigate to "Disk Converter" on the left panel.

Step 2. Choose "Convert MBR to GPT" and click "Next." (You can also choose "Convert GPT to MBR" at this step.)

Step 3. Select the target MBR/GPT disk and click "Convert."


People Also Ask

How Can I Change an MBR Disk Installing Windows 7 to GPT

Are you finding some ways to help you fix the problem of how can I change an MBR disk installing Windows 7 to GPT? Do not worry, this passage will show you some useful ways to help you fix this issue. Now you can read this passage.


Apr 18, 2024

A Disk Read Error Occurred, How to Fix?

Your computer unexpectedly freezes while you're using it, requiring a hard restart. You might get the message saying, 'A disk read error occurred', and are advised to restart Windows by pressing Ctrl+Alt+Del. However, most of the time, it won't work. Read this article to learn how to resolve this.


Apr 22, 2024

Is It OK to Convert GPT to MBR While Windows 10 Is Installed? Any Ideas?

Do you want to know: Is it ok to convert GPT to MBR while Windows 10 is installed? This article will answer your question and guide you to convert GPT to MBR.


Apr 18, 2024

Windows Server Cannot Boot From USB, How to Fix

If you meet the 'no boot media' error on your computer, don't worry. This short passage will help you find out the reasons quickly. And you will get the most efficient solution to fix Windows Server that cannot boot from USB.


Apr 22, 2024

Can't Add Partition to MBR disk Using Unallocated Space on Windows Server, I Need Help

Why can't add partition to MBR disk using unallocated space? This short article will focus on this issue and help you solve this problem.


Apr 22, 2024

Help, My Disk Space Beyond 2TB Will Be Unusable

Why my disk space beyond 2TB will be unusable, and how to solve this problem? This article and help with this issue. Dive into learning.


Apr 22, 2024