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docs/cmnds/hdd.md

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+# Harddrive's commandline tests
+
+### Test Write Speed
+
+```
+sync; dd if=/dev/zero of=tempfile bs=1M count=1024; sync
+```
+
+### Test Read Speed
+
+```
+dd if=tempfile of=/dev/null bs=1M count=1024
+```
+
+Clear Cache and read speed from hdd:
+
+```
+sudo /sbin/sysctl -w vm.drop_caches=3;dd if=tempfile of=/dev/null bs=1M count=1024
+```
+
+### Using hdparm
+
+Install:
+```
+sudo apt-get update; \
+sudo apt-get upgrade -y; \
+sudo apt-get install -y hdparm
+```
+
+Run (replace PWD with sudo password):
+```
+echo PWD | sudo -S hdparm -Tt /dev/sda
+```