Types of Storage Systems: Block, File, and Object Storage

Compare block, file, and object storage by the operations they expose. Learn when a workload needs small in-place updates, shared file paths, or whole-object access, and how those needs affect durability, concurrency, performance, and cost.

Start with the reads and writes the application must perform. A database page update, a shared document, and a video download need different interfaces.

The interface defines how software addresses data. The implementation determines latency, throughput, failure recovery, and cost. Do not infer all of those properties from the words “block,” “file,” or “object.”

A single application can use all three models at different layers. For example, a database may keep files on block volumes while the application stores uploaded media in an object service.

This lesson explores the three primary storage paradigms: block, file, and object storage. We will analyze their architectures, access patterns, and ideal use cases to equip us with the knowledge needed to select the appropriate solution for our next System Design interview or project.