CompTIA Tech+ (FC0-U71)IT Concepts and TerminologyMedium
A technician is troubleshooting a system that is exhibiting slow performance. They observe that the hard drive activity light is constantly on, even when no applications are actively being used. Which of the following is the MOST likely cause of this symptom?
- AAn incorrectly configured display driver causing graphical glitches.
- BOverheating CPU due to a malfunctioning cooling fan.
- CInsufficient RAM, causing excessive swapping to the hard drive.
- DA failing power supply unit (PSU) providing inconsistent power.
Show answer & explanationAnswer & explanation
Correct answer: C. Insufficient RAM, causing excessive swapping to the hard drive.
Constant hard drive activity, especially without active application use, is a classic symptom of insufficient RAM. The operating system uses the hard drive as virtual memory (swapping) when physical RAM runs out, leading to significant performance degradation.
Why the other options are wrong
- A. Incorrect display drivers primarily affect visual output and would not cause constant hard drive activity.
- B. An overheating CPU would cause throttling, system shutdowns, or freezes, not continuous disk I/O.
- D. A failing PSU would likely cause system instability, unexpected shutdowns, or failure to boot, not constant disk activity.
Virtual Memory (Swapping)
A memory management technique where a portion of a storage device (like a hard drive) is used as an extension of physical RAM. When RAM is full, less frequently used data is moved to virtual memory (swapped out) to free up RAM.
- Extends usable memory beyond physical RAM limits.
- Slower than physical RAM.
- Excessive use (thrashing) leads to significant performance degradation.
Memory trick: RAM's low, disk goes flow, that's where the slowness grows.