When you add a new disk into your machine, you should initialize it before it can be used for storing and retrieving. In other words, a new added disk must be registered in your operating system by initializing it. This feature allows you to initialize a disk into MBR or GPT mode.
To Initialize Disk
Step 1: Launch AOMEI Partition Assistant and right click on the raw disk which you want to initialize, let's take Disk 2 as an example. Choose "Initialize Disk" in the pop-up menu.
Step 2: In the pop up window, there will be two options for you to choose. You can initialize the disk to MBR or GPT style. Click "OK" to continue.
Step 3: Click "Apply" to wait for process to complete.
Notes:
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The Initialize Disk option will be grayed out if the disk has already been initialized.
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As for detailed info about difference between MBR disk and GPT disk, please refer to this article: How to Convert GPT to MBR or Convert MBR to GPT Disk?