Disk read / write speed

disk-speed-test.sh

#!/bin/bash
# Test read speed
sudo hdparm -Tt /dev/sda
# Results:
# /dev/sda:
#  Timing cached reads:   18564 MB in  1.99 seconds = 9311.48 MB/sec
#  Timing buffered disk reads: 1418 MB in  3.00 seconds = 472.03 MB/sec
# Test write speed
dd count=1k bs=1M if=/dev/zero of=~/test.img
# Results:
# 1024+0 records in
# 1024+0 records out
# 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.61916 s, 297 MB/s