You need to ensure that you can use all of the available space on each disk. what is one of the disks that you must initialized as a gpt disk?

A MBR-BIOS partitioned HDD ( hard disk drive) with space larger than 2TiB.

Explanation:

A storage drive must be initialised before it can be used to stored data. Initialising a drive gives a storage a partitioning style, which determines the process it takes to collect data from the drive. The two types of disk partitioning are MBR and GPT.

The MBR is the oldest of the two and is much more slower than the GPT, it occupies more space. GPT is fast and is smaller is size as compared to MBR.

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this seems to be in the wrong category. but i'll take some free points my dude

posting this in wrong category will result in people seeing it who won't know the answer.