About this interactive
A new disk is just a physical drive: Windows can see it, but there is nowhere to save a file. The lesson set one up in Disk Management, and every step depends on the one before it.
First the disk is initialized. That writes a partition table, the record of where each partition starts and ends, in one of two styles: GPT, the GUID Partition Table (the newer one, and the default), or MBR, the Master Boot Record. The video calls GPT a "good partition table"; the G stands for GUID, a globally unique identifier.
Next you create a volume in the unallocated space and choose its size. On an ordinary Windows disk, each volume you create gets a partition of its own: two volumes, such as a system volume and a data volume, means two partitions. (The video describes one partition split into several volumes; that is not how an ordinary Windows disk is set up.)
Then Windows gives the volume a drive letter, which is what makes it show up as a "drive" such as E:, and you choose its file system (NTFS for a drive used only by this Windows PC) and a label. Formatting writes that file system. Only now does the new drive appear in This PC, ready for files.
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