You can check if a disk uses GPT or MBR partition in Windows 11/10 effortlessly, using Disk Management, Device Manager, CMD or PowerShell.

First you need to reduce the size of your existing hard drive partition by whatever size you want the new partition to be: Right-click on it and choose Shrink Volume to do this.

There are some partitions on your hard disk. Before converting your hard disk from MBR to GPT, you should delete all the partitions. Your BIOS mode is set to legacy mode.

You can partition a hard drive with Windows' Disk Management utility by shrinking the existing partition and formatting the new unallocated partition.

The partition table configuration on a physical hard disk is standardized by GPT, which employs globally unique identifiers (GUID). Another type of partition table is the MBR.

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