Benchmark device (write) speed

bench.md

Benchmark write speed

Write zeros to a device (using a mountpoint).

Command

# Choose one
FOLDER="$HOME"
FOLDER="/tmp"
FOLDER="/mnt/your/sata/disk"
FOLDER="/dev/shm"  # this is your RAM

dd if=/dev/zero of="${FOLDER}/bench" bs=384k count=1k conv=fdatasync; rm -f "${FOLDER}/bench"

You may adjust the count for better estimation.

Sample output

4026531840 bytes (4.0 GB, 3.8 GiB) copied, 21.2701 s, 189 MB/s

Notes

• Ensure you don't have a bench that could be overridden
• Ensure you have enough disk space (here bs * count bytes)
• From dd manual:

  fdatasync physically write output file data before finishing

• Check lsblk for mountpoints.