#5635
In life, we may want to check the noise level when we feel that our living or working environment is a little noisy. At this point, if you don't want to spend money on the sound detector hardware that you'll rarely use later, you can use a mobile app like Sound Meter Pro on your smartphone to do the same thing.

#4781
If your laptop has both HDD and SSD installed at the same time (for example: use SSD to load and run the operating system, yet use HDD for storage purpose), then you've probably encountered and endured the bother that HDD makes a clatter every few seconds (that's usually 1, 3, or 10 seconds). Especially if you're using Western Digital, Seagate or Hitachi's hard drive products.