- A
Create a new managed disk from the snapshot and attach it to the VM
This restores the disk contents without rebuilding the VM or changing the OS disk.
- B
Redeploy the VM from the marketplace image
Why wrong: Redeploying from an image does not restore the deleted data disk contents from the snapshot.
- C
Convert the snapshot directly into an OS disk and boot from it
Why wrong: A data disk snapshot is not the same as a direct OS-disk recovery path for this scenario.
- D
Resize the VM to a larger size and the deleted disk will reappear
Why wrong: Changing VM size affects compute resources, but it does not recover deleted storage objects.
Question 839 of 1,170
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A managed data disk on a VM was deleted by mistake. You have a snapshot from before the deletion and want to restore the data with minimal impact to the VM's operating system disk. What should you do?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a new managed disk from the snapshot and attach it to the VM
Option A is correct because you can create a new managed disk from the snapshot and attach it as a data disk to the existing VM. This restores the data without affecting the OS disk or requiring a VM redeployment, minimizing downtime and impact.
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.
- ✓
Create a new managed disk from the snapshot and attach it to the VM
Why this is correct
This restores the disk contents without rebuilding the VM or changing the OS disk.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Redeploy the VM from the marketplace image
Why it's wrong here
Redeploying from an image does not restore the deleted data disk contents from the snapshot.
When this WOULD be correct
If the VM's OS disk is corrupted or compromised and you need to quickly restore the VM to its original state without preserving any data or customizations, redeploying from the marketplace image is a valid option.
- ✗
Convert the snapshot directly into an OS disk and boot from it
Why it's wrong here
A data disk snapshot is not the same as a direct OS-disk recovery path for this scenario.
When this WOULD be correct
If the VM's OS disk itself was deleted and you have a snapshot of the OS disk, you could create a managed disk from that snapshot and attach it as the OS disk to a new VM, or use it to replace the existing OS disk (with downtime).
- ✗
Resize the VM to a larger size and the deleted disk will reappear
Why it's wrong here
Changing VM size affects compute resources, but it does not recover deleted storage objects.
When this WOULD be correct
If a VM is experiencing performance issues due to insufficient disk throughput, resizing the VM to a larger size can increase the disk performance limits, potentially resolving the issue.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The AZ-104 exam frequently reuses these exact scenarios with slightly different constraints.
✓Create a new managed disk from the snapshot and attach it to the VMCorrect answer▾
Why this is correct
This restores the disk contents without rebuilding the VM or changing the OS disk.
✗Redeploy the VM from the marketplace imageWrong answer — click to see why▾
Why this is wrong here
Redeploying the VM from a marketplace image would replace the entire OS disk with a fresh image, losing all data and customizations, and does not restore the deleted data disk.
★ When this WOULD be the correct answer
If the VM's OS disk is corrupted or compromised and you need to quickly restore the VM to its original state without preserving any data or customizations, redeploying from the marketplace image is a valid option.
Why candidates choose this
Candidates may think redeploying is a quick fix to restore the VM, not realizing it wipes the OS disk and does not recover the deleted data disk.
✗Convert the snapshot directly into an OS disk and boot from itWrong answer — click to see why▾
Why this is wrong here
Converting a snapshot into an OS disk and booting from it would replace the VM's operating system disk, causing significant disruption and potential data loss on the OS disk, whereas the question asks to restore a data disk with minimal impact to the OS disk.
★ When this WOULD be the correct answer
If the VM's OS disk itself was deleted and you have a snapshot of the OS disk, you could create a managed disk from that snapshot and attach it as the OS disk to a new VM, or use it to replace the existing OS disk (with downtime).
Why candidates choose this
Candidates may think that since snapshots can create disks, directly using a snapshot as an OS disk is a quick fix, overlooking that the snapshot is from a data disk and that booting from it would replace the OS disk, causing major disruption.
✗Resize the VM to a larger size and the deleted disk will reappearWrong answer — click to see why▾
Why this is wrong here
Resizing a VM does not recover deleted disks; disks are independent resources and must be recreated from snapshots or backups.
★ When this WOULD be the correct answer
If a VM is experiencing performance issues due to insufficient disk throughput, resizing the VM to a larger size can increase the disk performance limits, potentially resolving the issue.
Why candidates choose this
Candidates may mistakenly think that disk resizing or VM operations can restore deleted disks, confusing disk management with VM lifecycle operations.
Analysis generated from the official AZ-104blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse snapshots with OS disk recovery options, incorrectly assuming a data disk snapshot can be used to boot the VM, or that resizing or redeploying the VM will restore deleted disks.
Trap categories for this question
Scenario analysis trap
A data disk snapshot is not the same as a direct OS-disk recovery path for this scenario.
Detailed technical explanation
How to think about this question
Managed disk snapshots are point-in-time copies stored as page blobs in Azure Storage, independent of the source disk. When you create a new managed disk from a snapshot, you can specify the same or different disk type (e.g., Standard HDD, Premium SSD) and attach it to any VM in the same region. This process uses the Azure Resource Manager API to instantiate the disk, ensuring the data is restored without affecting the OS disk's boot configuration or requiring a VM restart.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Deploy and Manage Azure Compute — study guide chapter
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FAQ
Questions learners often ask
What does this AZ-104 question test?
Deploy and Manage Azure Compute — This question tests Deploy and Manage Azure Compute — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a new managed disk from the snapshot and attach it to the VM — Option A is correct because you can create a new managed disk from the snapshot and attach it as a data disk to the existing VM. This restores the data without affecting the OS disk or requiring a VM redeployment, minimizing downtime and impact.
What should I do if I get this AZ-104 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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jun 11, 2026
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