Developing Solutions for Microsoft Azure (AZ-204) Practice Exam

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Which type of blob is used to store virtual hard drive files?

Block blobs
Append blobs
Page blobs
Stream blobs

The correct answer is: Page blobs

Page blobs are specifically designed to store large amounts of data that can be read and modified in smaller chunks, making them the ideal choice for virtual hard drive (VHD) files. This capability allows for random read and write operations, which is essential when dealing with virtual machines that require frequent access to virtual hard drives. Page blobs support up to 8 TB of data, providing the necessary capacity for VHDs, which may need to handle significant amounts of information depending on the applications and operating systems installed. Block blobs, while suitable for streaming and storing large amounts of unstructured data such as images and videos, do not support the random read/write characteristic needed for VHD files. Append blobs are optimized for append operations and are commonly used for logging or file storage where data is continually added, not modified. Stream blobs do not exist as a term in Azure Storage; storage solutions generally categorize blobs into block, page, and append blobs. Thus, page blobs are uniquely positioned to fulfill the requirements for storing virtual hard drives.