Disk Speed

Disk speed metrics quantify how efficiently a storage device (HDD or SSD) handles data. Understanding these metrics helps you diagnose system bottlenecks, choose the right hardware, and interpret benchmark tools like CrystalDiskMark. 1. The Big Three Metrics

Every storage evaluation focuses on three fundamental variables:

Throughput (Bandwidth): Measured in Megabytes per second (MB/s) or Gigabytes per second (GB/s). It represents the raw volume of data transferred over a specific timeframe.

IOPS (Input/Output Operations Per Second): The exact number of individual read or write tasks a drive handles every second. High IOPS are critical for managing hundreds of tiny files simultaneously, such as running an operating system or database.

Latency (Response Time): Measured in milliseconds (ms) or microseconds (

s), this represents the delay between a data request and when the drive executes the transfer. Lower latency equals a snappier, more responsive system. 2. Sequential vs. Random Workloads

A drive’s efficiency changes drastically depending on how data is physically arranged.