Key Features of Modern Personal Computers

1. Speed

Computers process data at an extremely fast rate. In a few seconds, they can perform tasks that would take a human days or even years to complete. Computer speed is measured in MHz (Megahertz) or GHz (Gigahertz).

• Microcomputers: Execute millions of instructions per second consistently without error.
• Supercomputers: Operate at speeds measured in nanoseconds and picoseconds, performing tasks one thousand to one million times faster than microcomputers.

2. Accuracy

Computers are highly accurate, though performance depends on the instructions provided. Because computers only execute what they are programmed to do, faulty instructions lead to faulty results—a concept known as GIGO (Garbage In, Garbage Out).

While errors can occur, advanced error-detecting techniques minimize these risks, making the probability of computer-generated errors negligible.

3. Reliability

Reliability measures a computer's performance against predetermined standards for failure-free operation. Key factors include:

• Minimal Human Intervention: Hardware processes data independently.
• Diagnostic Capabilities: Built-in tools allow for continuous system monitoring.

4. Storage Capability

Computers store vast amounts of data and recall information almost instantaneously. Since internal memory is limited, data is stored on external devices like magnetic tapes or disks.

Examples of storage capacity:

• CD-ROM: Up to 700 MB of data.
• Hard Disk: Capacities often exceeding 80 GB (where 1 GB = 1024 MB).

Small sections of data can be accessed quickly and retrieved from storage devices for processing whenever required.