Which one of the following devices is located inside the system unit?

Question

BlackTom AI · Accepted Answer

A hard disk drive (HDD) is an internal storage device that is typically mounted inside the computer’s system unit, so the correct answer is b. Hard disk drive.

1. Relevant knowledge points and concepts
- System unit: the metal/plastic enclosure that contains core computer components such as the motherboard, CPU, RAM, power supply, internal storage drives (HDD/SSD), and expansion cards.  
- Internal vs. external devices: internal devices are installed inside the system unit and connect directly to the motherboard or power supply; external devices connect via ports (USB, audio jack, network) and sit outside the case.  
- Hard disk drive (HDD): a primary mass-storage device normally installed in drive bays inside the system unit and connected via SATA or NVMe interfaces (for SSDs).

2. Step-by-step reasoning
- Step 1: Identify what each option is and how it typically connects to a computer.  
- Step 2: Determine whether that device is normally mounted inside the system unit or used externally.  
- Step 3: Choose the device that is normally internal.

3. Intermediate evaluation of options
- a. Scanner: an external peripheral used to capture images of paper; connects via USB — located outside the system unit.  
- b. Hard disk drive: installed in internal drive bay, connected to motherboard and power — located inside the system unit.  
- c. Headphones: external audio output device that plugs into audio jack or USB — outside the system unit.  
- d. 3D printer: large external peripheral used to print objects — outside the system unit.

4. Why the correct answer is correct
- HDDs are designed to be mounted inside the computer case to provide permanent mass storage and direct connections to the motherboard and power supply; this is the defining trait of an internal component.

5. Why other options are incorrect
- Scanner, headphones, and 3D printer are all external peripherals that sit outside the case and connect via external ports.

6. Conclusion
- Therefore the correct choice is b. Hard disk drive, which matches the provided answer.

Which one of the following devices is located inside the system unit?单项选择题

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