The answer is providing persistent block storage volumes for Azure Virtual Machines. Azure Disk Storage is the correct choice because it delivers durable, high-performance block storage that operates as virtual hard disks (VHDs), which can be attached to a VM as either an OS disk or a data disk. This storage is persistent, meaning it survives VM reboots, re-deployments, and even hardware failures, making it essential for IaaS workloads that require low-latency, random-access I/O. On the AZ-900 exam, this concept tests your understanding of how Azure separates compute from storage—a common trap is confusing Disk Storage with Azure Blob Storage, which is object storage for unstructured data, not block-level VM disks. A helpful memory tip: think of Disk Storage as the “hard drive” inside your VM that stays even when the machine restarts, unlike temporary storage that vanishes.
AZ-900 Describe Azure architecture and services Practice Question
This AZ-900 practice question tests your understanding of describe azure architecture and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Providing persistent block storage volumes for Azure Virtual Machines
Azure Disk Storage provides durable, high-performance block storage for Azure Virtual Machines. Each disk is a virtual hard disk (VHD) that can be attached to a VM as an OS disk or data disk, offering persistent storage that survives VM reboots and re-deployments. It is the primary storage option for IaaS workloads requiring low-latency, random-access I/O.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Hosting static websites and web content
Why it's wrong here
Static website hosting is done with Azure Blob Storage, not Disk Storage.
✓
Providing persistent block storage volumes for Azure Virtual Machines
Why this is correct
Azure Disk Storage provides managed persistent block storage (HDD/SSD) that attaches to Azure VMs.
Related concept
Read the scenario before looking for a memorised answer.
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Sharing files between multiple computers via SMB protocol
Why it's wrong here
SMB file sharing is provided by Azure Files, not Disk Storage.
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Archiving infrequently accessed data at low cost
Why it's wrong here
Low-cost archival is done with Azure Blob Storage Archive tier, not Disk Storage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Azure Disk Storage with Azure Files or Blob Storage because all three are storage services, but Disk Storage is exclusively block-level storage for VMs, not for file sharing or web hosting.
Detailed technical explanation
How to think about this question
Azure Disk Storage uses page blobs in the Azure Storage platform, with each disk backed by a fixed-size VHD (up to 32 TB for managed disks). Under the hood, disks are replicated three times within a datacenter for durability and can be configured as Standard HDD, Standard SSD, or Premium SSD to match performance needs. A common real-world scenario is attaching multiple data disks to a single VM for database workloads, where each disk can be striped using Storage Spaces or RAID to achieve higher IOPS and throughput.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-900 question in full detail.
Describe Azure architecture and services — This question tests Describe Azure architecture and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Providing persistent block storage volumes for Azure Virtual Machines — Azure Disk Storage provides durable, high-performance block storage for Azure Virtual Machines. Each disk is a virtual hard disk (VHD) that can be attached to a VM as an OS disk or data disk, offering persistent storage that survives VM reboots and re-deployments. It is the primary storage option for IaaS workloads requiring low-latency, random-access I/O.
What should I do if I get this AZ-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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