Azure Blob Storage offers unstructured data storage in the cloud. It can store all kinds of data, such as documents, VHDs, images, and audio files. There are two types of blobs that you can create. One type is page blobs, which are used for the storage of disks. So, when you have a VHD that needs to be stored and attached to your Virtual Machine (VM), you will have to create a page blob. The maximum size of a page blob is 1 TB. 

The other type is block blobs, which basically covers all of the other types of data that you can store in Azure, such as files and documents. The maximum size of a block blob is 200 GB. However, there is also a third blob type named append blob, but this one is used internally by Azure and can't be used to store actual files. There are a couple of ways that you can copy blobs to your blob storage account. You can use the Azure portal (only one at a time) or Azure Storage Explorer, or you can copy your files programmatically using .NET, PowerShell, or the CLI or by calling the REST API.