CompTIA Data+ DA0-002 (V2) Practice Question

Block storage divides data into fixed-size chunks (blocks) that are addressed directly by the operating system using low-level protocols such as iSCSI or NVMe/TCP. Because the host treats the volume like a locally attached disk, the database can format the device with its own file system and issue random reads and writes with sub-millisecond latency-ideal for OLTP workloads.

The other statements describe capabilities of other storage types:

• Object storage keeps data as immutable objects with rich metadata and often uses replication or erasure coding across regions to maximize durability; this design trades latency for scalability and resilience.
• File storage exposes a hierarchical directory structure over protocols like NFS or SMB for shared user access, which adds additional overhead compared with raw block devices.
• Erasure-coded, capacity-optimized architectures are tuned for archival or infrequently accessed data, not latency-sensitive transaction processing.