Sequential read speed measures how quickly a storage device (such as an SSD or hard drive) retrieves data stored in consecutive locations on its surface or memory chips. The result is expressed in megabytes per second (MB/s) and represents the fastest practical performance you'll see in everyday use.
Unlike random read speed, which measures scattered data access, sequential read reflects tasks where files are stored in order. This includes:
- Loading video files or large photos
- Opening audio files or documents
- Copying files to or from the drive
- Launching applications from storage
For example, a modern NVMe SSD might claim sequential read speeds of 3,500 MB/s to 7,000 MB/s, whilst a 2.5-inch SATA drive typically maxes out around 550 MB/s. A mechanical hard drive, by contrast, might manage 150 to 200 MB/s.
When shopping for storage, sequential read speed tells you how fast the device will handle bulk data transfer. It's the most visible performance metric in marketing materials and benchmarks. However, remember that actual speed depends on your system's connection type: USB 2.0 limits you to 60 MB/s regardless of the drive's capability, whilst Thunderbolt 3 or USB 3.2 allow you to approach the drive's true limits. For everyday use, SSDs with sequential reads above 500 MB/s feel significantly snappier than mechanical drives, whilst NVMe drives excel when moving large project files or video content.