What is the difference between Azure managed disks and a storage account?
Interviewer Expectations for this Question
01
Core Competency
Assesses fundamental understanding of Microsoft Azure conventions, runtime behavior, and memory/performance considerations.
02
Evaluation Criteria
Hiring managers look for precision, avoidance of ambiguous jargon, and ability to explain trade-offs under real production conditions.
Comprehensive Model Answer
Verified Solution
Managed disks are block-level volumes for Azure VMs, managed by Azure. A storage account is a broader namespace that hosts blobs, files, queues, and tables, and previously also unmanaged disks.
- Managed disks are created and managed by Azure, replicated within a region, and support snapshots, encryption, and disk types such as Standard HDD, Standard SSD, Premium SSD, and Ultra Disk. You pick a size and performance tier.
- A storage account is a container for services such as Blob, Azure Files, Queue, and Table. It defines replication (LRS, ZRS, GRS), performance tier, and access tier.
VMs now use managed disks by default; unmanaged disks in storage accounts are legacy. Use a storage account for object and file data, and managed disks for VM OS and data volumes.
Candidate Response Strategy & Interview Tips
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- Demonstrate real-world trade-offs: Discuss where this approach excels and when you would avoid it in production systems.
- Discuss complexity & edge cases: Proactively explain time/space complexity or boundary conditions (null values, scale limits).
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