When using Secure Boot can other drives still be MBR?

windows-10 windows-installation formatting secure-boot

I recently read:

If Secure Boot is enabled in BIOS, then your System will need your hard drive to be GPT …

But what about the other drives? Can they still be MBR?


Solution 1:

Secure boot is only relevant to verifying the boot software. It works with both MBR and GPT devices.

The constraints are actually that of the firmware: UEFI needs GPT (except in Legacy mode), while BIOS needs MBR.

As a GPT disk has a fake MBR header, it can work with a device that requires MBR (with limitations).

Devices which are not boot devices don't have any constraints and can be either MBR or GPT, as supported by the operating system.

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