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Commonly confused · Systems & Data Center

Block vs File vs Object Storage: What's the Difference?

Block storage splits data into fixed-size blocks and presents raw volumes to a server, ideal for databases and VM disks. File storage organizes data in a hierarchy of folders shared over network protocols. Object storage stores data as objects with metadata and unique IDs in a flat namespace accessed over HTTP APIs, scaling almost without limit.

Block Storage

Full definition
vs

File Storage

vs

Object Storage

Full definition
Block StorageFile StorageObject Storage
StructureRaw volumes of blocksHierarchical folders and filesFlat namespace of objects in buckets/containers
Access methodiSCSI, Fibre Channel, attached diskNFS, SMBREST/HTTP APIs
MetadataMinimalBasic file attributesRich, custom metadata
PerformanceLowest latencyModerateHigher latency, massive throughput
ScalabilityLimited per volumeModerateVirtually unlimited
Cloud examplesAmazon EBS, Azure Managed Disks, Persistent DiskAmazon EFS, Azure Files, FilestoreAmazon S3, Azure Blob Storage, Cloud Storage
Best forDatabases, boot volumesShared file systems, home directoriesBackups, media, data lakes, static websites
Remember it

Block is a raw disk, file is a shared folder, object is a giant bucket of labeled items.

Exam tip

Cloud exams ask which service fits a workload: a database volume needs block storage, shared access for many VMs needs file storage, and unstructured data at scale needs object storage.

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