Block Storage serves as a secure virtual storage space that can be linked to a container or virtual machine instance, either to extend storage capacity or serve as shared storage for multiple container/virtual machine instances. This shared storage can be also mirrored across all {ANYNODE}s.
There exist two storage categories:

1. cn - Block Storage Disk Drive
   It is capable of being attached to multiple Instances-cn and Instances-vm type instances in a shared-attach manner.
2. vm - X Virtual Machine Disk Drive
   It can be attached to a single Instances-xvm type instance in a dedicated-attach fashion.