How many disks do all Azure virtual machines have at least?

Azure virtual machines are designed to have a minimum of one disk, which is the operating system disk. This OS disk is essential as it contains the operating system that allows the virtual machine to boot and function. All Azure VMs automatically come with this OS disk when they are created, ensuring they have the necessary environment to run applications and services.

In addition to the OS disk, users can attach additional data disks depending on their needs for storage and performance. However, it is the presence of that one mandatory OS disk that sets the foundation for a functioning virtual machine in Azure. Other disks, such as data disks, are optional and added based on the specific use case but do not change the fact that every VM must have at least the OS disk to operate effectively. This reflects Azure's design philosophy, ensuring that every VM is ready to run with at least the basic requirements fulfilled.