How to Convert MBR to GPT and meet Secure Boot Requirements and prepare for Windows 11
when it says "windows 11 your pc does not meet the requirements"

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Creating an EFI system partition
For Windows to remain bootable after the conversion, an EFI system partition (ESP) must be in place. MBR2GPT creates the ESP using the following rules:

The existing MBR system partition is reused if it meets these requirements:
a. It is not also the OS or Windows Recovery Environment partition.
b. It is at least 100MB (or 260MB for 4K sector size disks) in size.
c. It is less than or equal to 1GB in size. This is a safety precaution to ensure it is not a data partition.
d. The conversion is not being performed from the full OS. In this case, the existing MBR system partition is in use and cannot be repurposed.
If the existing MBR system partition cannot be reused, a new ESP is created by shrinking the OS partition. This new partition has a size of 100MB (or 260MB for 4K sector size disks) and is formatted FAT32.
If the existing MBR system partition is not reused for the ESP, it is no longer used by the boot process after the conversion. Other partitions are not modified.
Disk Prerequisites
Before any change to the disk is made, MBR2GPT validates the layout and geometry of the selected disk to ensure that:

The disk is currently using MBR
There is enough space not occupied by partitions to store the primary and secondary GPTs:
16KB + 2 sectors at the front of the disk
16KB + 1 sector at the end of the disk
There are at most 3 primary partitions in the MBR partition table
One of the partitions is set as active and is the system partition
The disk does not have any extended/logical partition
The BCD store on the system partition contains a default OS entry pointing to an OS partition
The volume IDs can be retrieved for each volume which has a drive letter assigned
All partitions on the disk are of MBR types recognized by Windows or has a mapping specified using the /map command-line option
If any of these checks fails, the conversion will not proceed and an error will be returned.

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