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Azure Disk Storage

  • Block-level storage volumes for Azure Virtual Machines
  • Disk Storage is a managed disk that is designed for 99.999% availability.
  • You can create 50,000 VM disks for each region.


  • Different types of storage options: Standard HDD, Standard SSD, Premium SSD, and Ultra Disk volumes up to 64 TiB.
  • The OS disk has a maximum capacity of 4,095 GiB.
  • The maximum size of the data disk is 32,767 GiB.
  • Managed disks are integrated with the availability sets to ensure that the VM disks are separated from each other in an availability set to prevent a single failure point.
  • You can assign specific permissions for a managed disk to one or more users using Azure RBAC.
  • You can use the temporary disk to store data such as page or swap files
  • Ephemeral OS disks for stateless applications
  • Attach a managed disk to multiple virtual machines (VMs) simultaneously using Azure shared disks.
  • With snapshots, you can take a back up of your managed disks at any given point in time.

Disk Types

  • Standard HDD
    • Low cost and suitable for backups.
    • Write latencies under 10ms.
    • Read latencies under 20ms.
  • Standard SSD
    • Consistent performance at lower IOPS levels.
    • Higher reliability, scalability, and lower latency over HDD.
  • Premium SSD
    • High-performance and low-latency disk for VMs.
    • Consistent IOPS, and throughput.
    • Offers disk bursting and can burst their IOPS per disk up to 3,500 and their bandwidth up to 170 Mbps.
    • Peak burst limit of 30 mins
  • Ultra Disk
    • High throughput, high IOPS, and consistent low latency disk storage
    • Only supports un-cached reads and un-cached writes
    • Doesn’t support disk snapshots, VM images, availability sets, Azure Dedicated Hosts, or Azure disk encryption.
    • The integration with Azure Backup or Azure Site Recovery is not supported.


Standard HDD

Standard SSD

Premium SSD

Ultra Disk

Disk type






Backup, non-critical, infrequent access

Web servers, and light applications of enterprise

Production and performance sensitive workloads

IO-intensive workloads, top tier databases, and other transaction-heavy workloads

Max disk size

32,767 GiB

32,767 GiB

32,767 GiB

65,536 GiB

Max throughput

500 MB/s

750 MB/s

900 MB/s

2,000 MB/s








  • Server-Side Encryption (SSE) is performed by the storage service.
  • Azure Disk Encryption (ADE) can be enabled on the OS and data disks.
  • Encrypted using 256-bit AES encryption.
  • For standard HDDs, standard SSDs, and premium SSDs: disabling or deleting the key will automatically shut down all the VMs with disks using that key.
  • If you disable or delete a key, any virtual machines with ultra disks using the key won’t automatically shut down.
  • Once you enable end-to-end encryption, temp disks and ephemeral OS disks are encrypted with platform-managed keys.


  • Managed disk size is billed on the provisioned size.
  • Snapshots are charged based on the size used.
  • Outbound data transfers incur billing for bandwidth usage.
  • You are charged for the number of transactions that you perform on a managed disk (the number of read and write data operations performed).

Azure Blob vs Disk vs File Storage:

Want to learn more about Azure? Watch the official Microsoft Azure YouTube channel’s video series called Azure Tips and Tricks.

Validate Your Knowledge

Question 1

Question Type: Hotspot

For each of the following items, choose Yes if the statement is true or choose No if the statement is false. Take note that each correct item is worth one point.

Correct Answer: No – No – No

Azure Virtual Machines (VM) gives you the flexibility of virtualization without having to buy and maintain the physical hardware that runs it. However, you still need to maintain the VM by performing tasks, such as configuring, patching, and installing the software that runs on it.

You can pay for the computing capacity by the second, with no long-term commitment or upfront payments. You can also increase or decrease compute capacity on demand. It also has an option to start or stop at any time and only pay for what you use.

Azure virtual machines can be used in various ways. Some examples are:

Development and test – Azure VMs offer a quick and easy way to create a computer with specific configurations required to code and test an application.

Applications in the cloud – Because demand for your application can fluctuate, it might make economic sense to run it on a VM in Azure. You pay for extra VMs when you need them and shut them down when you don’t.

Extended datacenter – Virtual machines in an Azure virtual network can easily be connected to your organization’s network.

The number of VMs that your application uses can scale up and out to whatever is required to meet your needs.

When you delete a virtual machine (VM) in Azure, by default, any disks that are attached to the VM aren’t deleted. This helps prevent data loss due to the unintentional deletion of VMs. After a VM is deleted, you will continue to pay for unattached disks.

The statement that says: Azure virtual machines are billed on a per-hour basis is incorrect because Azure virtual machines are billed by the second and not per hour.

The statement that says: When you delete a virtual machine in Azure, by default, any disks that are attached to the VM are deleted is incorrect because this is not the right outcome if you delete an Azure virtual machine. Any disks that are attached to the VM will actually not be deleted if its VM is deleted. This underlying mechanism helps to prevent data loss due to the unintentional deletion of VMs. Take note that after a VM is deleted, you will still continue to pay for unattached disks.

The statement that says: Disks attached to stopped virtual machines do not incur costs is incorrect because you still continue to accrue charges for the Azure storage needed for the VM’s OS disk and any attached data disks even if your virtual machines are already stopped.


Note: This question was extracted from our AZ-900 Microsoft Azure Fundamentals Practice Exams.

For more Azure practice exam questions with detailed explanations, check out the Tutorials Dojo Portal:

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