COMPUTER FUNDAMENTALS

Detailed explanation-1: -Rotational latency (sometimes called rotational delay or just latency) is the delay waiting for the rotation of the disk to bring the required disk sector under the read-write head. It depends on the rotational speed of a disk (or spindle motor), measured in revolutions per minute (RPM).

Detailed explanation-2: -Since hard disks are mechanical, you need to wait for the disk to rotate to the required disk sector. Disk latency is around 13ms, but it depends on the quality and rotational speed of the hard drive. RAM latency is around 83 nanoseconds.

Detailed explanation-3: -Storage latency is the time that a storage array takes to complete a read request or acknowledge a write to the database. Innovations in storage media have driven storage latency lower. For example, before flash SSDs, storage latencies were typically measured in milliseconds.

Detailed explanation-4: -SSD has lower latency, faster read/writes, and supports more IOPs (input output operations per second) compared to HDD. Hard disk drives use more electricity to rotate the platters, generating heat and noise.