Disk Storage and Storage Security

Azure Managed Disks are block-level storage volumes attached to Azure VMs — the cloud equivalent of a physical hard drive or SSD in a server. Azure manages the disk: it handles storage account placement, redundancy, and lifecycle automatically. Before Managed Disks, customers had to manage storage accounts and VHD files themselves, which was error-prone. Today, Managed Disks are the standard way to provide persistent OS and data storage for VMs, simplifying management and supporting availability set and zone deployments natively.

Azure offers four managed disk types: Standard HDD — lowest cost, up to 500 IOPS/disk; for dev/test VMs and non-critical workloads. Standard SSD — more consistent performance than HDD, up to 6,000 IOPS; for lightly used web servers and CI/CD build agents. Premium SSD — high performance, up to 20,000 IOPS; for production databases, enterprise applications, and any I/O-sensitive workload. Ultra Disk — highest performance, up to 160,000 IOPS with sub-millisecond latency; for the most demanding workloads like SAP HANA and top-tier SQL Server. Ultra Disks require VMs with specific families and configurations.