What is CSM boot?
CSM is something that allows booting in legacy BIOS mode on UEFI systems. The Compatibility Support Module (CSM) is a component of the UEFI firmware that provides legacy BIOS compatibility by emulating a BIOS environment, allowing legacy operating systems and some option ROMs that do not support UEFI to still be used.
Should I enable or disable CSM?
Hence, CSM helps emulate a BIOS environment that is compatible with your current OS. Disabling CSM will allow you to enable UEFI on your system which is needed to install the most modern compatible Operating Systems.
Do I need CSM enabled?
To put it in a nutshell, CSM exists to provide compatibility with systems that support or do not support UEFI completely, as well as systems that must be installed in Legacy. Therefore, if you need to boot a traditional MBR device, you need to enable the CSM.
What is the difference between UEFI and CSM mode?
Legacy (CSM) and UEFI are different ways to boot from storage disks (which often take the form of SSD these days). CSM uses an MBR (Master Boot Record) in a specific format of 512 Bytes to boot the operating system. UEFI uses files within a large partition (typically 100 MB) to boot the operating system.
Is CSM Secure Boot?
CSM Support is used for booting from legacy devices, which is the exact opposite goal of Secure Boot. Custom would allow us to set the keys used for attestation for Secure Boot. But for our purposes, Standard solves the problem.
Should I disable CSM for Windows 11?
Even if your computer is updated with the latest UEFI firmware, certain settings may make the system incompatible with Windows 11. It results in losing certain UEFI features essential for the Windows 11 update. Hence, you’ll need to disable CSM to run the latest compatible operating system.
How do I enable CSM in BIOS?
Press the power button to turn on the computer, and then immediately press the Esc key repeatedly until the Startup Menu opens. Press F10 to open BIOS Setup. Use the right arrow key to select System Configuration, use the down arrow key to select Boot Options, and then press Enter. Check for Legacy Support in the list.
Is CSM the same as Legacy?
The Compatibility Support Module (CSM) is a component of the UEFI firmware that provides legacy BIOS compatibility by emulating a BIOS environment, allowing legacy operating systems and some option ROMs that do not support UEFI to still be used.
Does Windows 11 require CSM?
To upgrade Windows 10 to Windows 11 in the supported fashion the computer must be in UEFI native (without CSM). The disk drive must be in GPT to upgrade in the supported fashion.
Which boot mode is best for Windows 10?
In general, install Windows using the newer UEFI mode, as it includes more security features than the legacy BIOS mode. If you’re booting from a network that only supports BIOS, you’ll need to boot to legacy BIOS mode.