What Is CSM Support & Should I Enable It in BIOS? [Answered]

What Is CSM in BIOS

Do you know why many UEFI firmware implementations can boot from the MBR-partitioned disks? The answer is CSM support. It provides the support of legacy BIOS backward compatibility with UEFI systems.

Should You Enable or Disable CSM Support

Should you enable or disable CSM BIOS? The answer depends on your Windows versions. If your computer is fairly new and comes with Windows OS pre-installed, the BIOS CSM is usually disabled by default. For example, if you are ready to install/reinstall Windows 10 on a new SSD, you don’t have to enable CSM support while installing.

How to Enable or Disable CSM Support

If you need to enable or disable CSM support BIOS, you can refer to the simple guide below. Here we will show you how to do that on ASUS, Gigabyte, ASRock, and MSI.

What’s the Difference Between UEFI and CSM Boot

Many users are still confused about the difference between the UEFI and CSM boots. CSM boot mode offers the compatibility for legacy BIOS that can support a bootable disk up to 2 TB, while UEFI boot mode can support up to 9 ZB.

What’s Your Opinion

What is CSM in BIOS? Should you enable or disable CSM support? After reading the above information, I believe that you already have cleared the answers. If you are troubled by the CSM boot issue, you also can use the troubleshooting method we explained.


Position: Columnist



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