Sometimes, the internal wiring of a PC (especially a desktop) can drag or snag on one of the fans, creating a “tap” or “scratch” noise. Most desktop computers have some kind of active cooling-a system of small fans that draw air into the case to cool components and expel hot air from the case. If you’d rather not crack open your PC case, there are plenty of external USB-based disc drives to choose from. Even some laptops have modular disc drives that can be swapped out. If you want to fix it, replacement internal drives are easily available and simple to install (just make sure you get an IDE or SATA drive that matches the connection on your motherboard). Unless you have some crucial data you need to access on a CD or DVD, your PC can get by fine without one. Luckily, a failing CD drive isn’t an immediate, “back up your data now” problem like a failing hard drive. A loud clicking sound usually means that either the drive is trying to read data off of a faulty disc, or one of the moving parts like the small electric motor or the laser track is faulty. Since optical drives also use a spinning disc and a moving arm with a laser lens, it will make some of the same whirring and tapping noises as it reads or writes data. Mechanically, the optical drive in your computer is similar to the hard drives described above-the only difference is that you can remove and replace the storage medium. Note: if your computer uses a solid state drive (SSD), a type of flash storage with no moving parts, it’s safe to assume that any clicking noises aren’t coming from the storage. RELATED: What's the Best Way to Back Up My Computer? (Self-Monitoring, Analysis, and Reporting Technology), so it’s also worth checking in to see if your hard drive thinks it’s failing. Most drives also use a form of self-monitoring named S.M.A.R.T. You’ll need to get a replacement right away. If you can boot into your operating system, back up your data immediately, as it’s possible the drive could fail at any time. That usually indicates some kind of mechanical failure with either the disk or the arm, and it could mean that your hard drive is in trouble. What you don’t want to hear is a loud “snap” or “click” noise. A fully-functioning hard drive that’s powered on will make a soft “hum” or “whir” noise from the spinning disk, and more audible “tap” noises as the actuator arm moves rapidly back and forth. That’s because it has some of the same design elements-a spinning “platter” disk where the information is stored, and a moving actuator arm that can read and write the data just like the needle plays music from an old record. Inside the metal case, a hard drive looks a lot like a high-tech record player. A little low-volume clicking is actually expected from most hard drives.
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