- A
Detach the disk, shrink it, and reattach it to refresh the filesystem.
Why wrong: Shrinking the disk is not the solution, and detaching it is unnecessary when the goal is simply to use newly allocated capacity. The issue is inside the guest OS, not with Azure disk allocation.
- B
Expand the partition or volume inside the guest operating system.
After Azure grows the managed disk, the operating system still needs to recognize and consume that extra space. Expanding the partition or volume inside the guest OS is the required next step so the application can use the larger capacity.
- C
Convert the data disk to a shared disk so Windows can auto-detect the size increase.
Why wrong: Shared disks are for specific clustering scenarios and do not automatically solve a filesystem expansion problem. The disk type does not change the need to expand the volume in the operating system.
- D
Redeploy the virtual machine to apply the new disk size.
Why wrong: Redeploying is unnecessary and disruptive. The Azure disk has already been resized, so the remaining task is to expand the partition or filesystem inside the VM.
Quick Answer
The correct next step is to expand the partition or volume inside the guest operating system. While resizing the Azure managed disk in the Azure portal or CLI updates the underlying virtual hard disk (VHD) to show a larger capacity in the Azure interface, the guest OS—whether Windows or Linux—still sees the original partition boundaries and cannot use the new unallocated space until the volume is extended manually. On the AZ-104 exam, this scenario tests your understanding that Azure control-plane actions (like disk resizing) are separate from guest OS configuration; a common trap is assuming the new space is immediately available or that a simple reboot suffices. To extend the partition after resizing an Azure managed disk, use tools like Disk Management (diskmgmt.msc) or the diskpart command in Windows, or fdisk/growpart in Linux. Remember the mnemonic: “Azure resizes the disk, but the OS must claim the space.”
AZ-104 Deploy and Manage Azure Compute Practice Question
This AZ-104 practice question tests your understanding of deploy and manage azure compute. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An administrator has already increased the size of a managed data disk attached to a running Windows VM. Azure now shows the larger disk size, but the application still cannot use the new capacity. What should the administrator do next?
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
Expand the partition or volume inside the guest operating system.
When a managed data disk attached to a running Windows VM is resized in Azure, the underlying virtual hard disk (VHD) expands, but the guest operating system does not automatically recognize the new unallocated space. The administrator must use the Disk Management tool (diskmgmt.msc) or the diskpart command to extend the volume or partition into the unallocated space. This is a standard operating system task, not an Azure control-plane action.
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.
- ✗
Detach the disk, shrink it, and reattach it to refresh the filesystem.
Why it's wrong here
Shrinking the disk is not the solution, and detaching it is unnecessary when the goal is simply to use newly allocated capacity. The issue is inside the guest OS, not with Azure disk allocation.
- ✓
Expand the partition or volume inside the guest operating system.
Why this is correct
After Azure grows the managed disk, the operating system still needs to recognize and consume that extra space. Expanding the partition or volume inside the guest OS is the required next step so the application can use the larger capacity.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Convert the data disk to a shared disk so Windows can auto-detect the size increase.
Why it's wrong here
Shared disks are for specific clustering scenarios and do not automatically solve a filesystem expansion problem. The disk type does not change the need to expand the volume in the operating system.
- ✗
Redeploy the virtual machine to apply the new disk size.
Why it's wrong here
Redeploying is unnecessary and disruptive. The Azure disk has already been resized, so the remaining task is to expand the partition or filesystem inside the VM.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume Azure automatically applies the size change to the guest OS, when in fact the administrator must manually extend the partition inside the operating system using disk management tools.
Trap categories for this question
Scenario analysis trap
Shared disks are for specific clustering scenarios and do not automatically solve a filesystem expansion problem. The disk type does not change the need to expand the volume in the operating system.
Detailed technical explanation
How to think about this question
Under the hood, Azure expands the underlying page blob or managed disk at the storage layer, but the Windows guest sees the disk as a SCSI device with a fixed partition table. The administrator must use diskpart's 'extend' command or the Disk Management GUI to merge the unallocated space into the existing volume. In real-world scenarios, if the disk is the system drive (C:), extending the partition may require a reboot or use of third-party tools, but for data disks, the extension is online and non-disruptive.
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.
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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: Expand the partition or volume inside the guest operating system. — When a managed data disk attached to a running Windows VM is resized in Azure, the underlying virtual hard disk (VHD) expands, but the guest operating system does not automatically recognize the new unallocated space. The administrator must use the Disk Management tool (diskmgmt.msc) or the diskpart command to extend the volume or partition into the unallocated space. This is a standard operating system task, not an Azure control-plane action.
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 →
Same concept, more angles
1 more ways this is tested on AZ-104
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Based on the exhibit, what should the administrator do next so the VM can use the extra capacity on the resized data disk?
easy- A.Resize the managed disk again in Azure.
- ✓ B.Extend the partition or file system inside the VM.
- C.Detach the disk and attach it to another VM.
- D.Create a new virtual machine from the disk.
Why B: After resizing a managed disk in Azure, the additional capacity is allocated at the Azure platform level but is not automatically available to the operating system. The administrator must extend the partition or file system inside the VM using tools like Diskpart (Windows) or fdisk/resize2fs (Linux) to make the new space usable. This is a standard post-resize step because the OS still sees the original partition boundaries.
Last reviewed: Jun 11, 2026
This AZ-104 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the AZ-104 exam.
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