Lesson Notes By Weeks and Term v5 - Grade 11

Lesson Video

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Performance objectives

• Identify and explain advanced hardware components like SSDs and GPUs.
• Describe the principles and context of OS virtualization.
• Diagnose and resolve common hardware and software issues.
• Explain the importance of system maintenance and backups.
• Differentiate between various software licensing models.

Lesson summary

This week, we delve into the exciting world of advanced hardware, software, and troubleshooting. Understanding these concepts is crucial in Computer Applications Technology (CAT) because it empowers you to not just use computers, but also to understand how they work, diagnose problems, and potentially even build or customize your own systems. In a rapidly digitalizing South Africa, these skills are becoming increasingly valuable in various sectors, from small businesses to large corporations.

Lesson notes

2.1 Advanced Hardware Components: Solid-State Drives (SSDs): Unlike traditional Hard Disk Drives (HDDs) that use spinning platters to store data, SSDs use flash memory. This results in significantly faster read and write speeds, leading to quicker boot times, application loading, and overall system responsiveness. Imagine opening a large document in Microsoft Word; on an HDD, it might take several seconds, while on an SSD, it could open almost instantly. SSDs are also more durable and less susceptible to damage from physical shock. The price per gigabyte is generally higher for SSDs than HDDs, but the performance benefits often outweigh the cost.

Why they matter in SA: Reduced loading times for critical business applications, particularly important in areas with limited internet bandwidth where cloud-based solutions are slow. Increased reliability in environments prone to power surges or physical damage.

Example: Upgrading the computer in a rural clinic with an SSD to quickly access patient records, even during load shedding (if coupled with a UPS).

High-End Graphics Cards (GPUs): These cards are designed for demanding applications like gaming, video editing, and graphic design. They have powerful processors (GPUs) and dedicated memory (VRAM) to handle complex graphical calculations. A graphics card is essential for running software like Adobe Photoshop, Blender (for 3D modeling), or even resource-intensive websites with complex animations.

Why they matter in SA: Facilitate training in industries requiring visual design and software development; support the growth of the gaming and eSports community.

Example: A multimedia design student using a powerful graphics card to create promotional videos for a local tourism company.

Advanced Cooling Systems: High-performance CPUs and GPUs generate a lot of heat. If not properly cooled, they can overheat, leading to reduced performance, instability, and even permanent damage. Advanced cooling systems, such as liquid coolers and large air coolers, are designed to dissipate heat more effectively. Liquid cooling uses a coolant to transfer heat away from the CPU or GPU to a radiator, where it is dissipated by fans. Air coolers use a heatsink (a metal block with fins) and fans to achieve the same result.

Why they matter in SA: Ensure reliable operation of computers in hot climates; extend the lifespan of expensive hardware investments.

Example: Using a liquid cooling system in a server room located in a building without air conditioning to prevent servers from overheating. 2.2 Operating System (OS)

Virtualization: Virtualization allows you to run multiple operating systems on a single physical computer simultaneously. This is achieved through software called a hypervisor, which creates virtual machines (VMs) that act like independent computers. Each VM has its own operating system, applications, and resources (CPU, RAM, storage). Virtualization offers several benefits, including: Resource Optimization: Better utilization of hardware resources by running multiple applications on a single machine.

Cost Savings: Reduced hardware costs and energy consumption.

Simplified Management: Easier to manage and maintain multiple operating systems.

Testing and Development: Allows you to test software in different environments without affecting your main system.

However, virtualization also has some drawbacks: Overhead: Virtualization introduces some performance overhead, as the hypervisor consumes resources.

Complexity: Setting up and managing virtual machines can be complex.

Security Risks: A security breach in one VM can potentially compromise other VMs on the same host.

Why it matters in SA: Allows businesses to run legacy applications on newer hardware, consolidate server infrastructure to reduce costs, and provide flexible IT solutions to remote workers with different OS needs.

Example: A small accounting firm uses virtualization to run both Windows (for their accounting software) and Linux (for their file server) on a single computer, saving money and simplifying management. 2.3 Software Licensing Models: Freeware: Software that is available for free, typically with no restrictions on usage or distribution. The developer retains copyright.

Example: Adobe Reader.

Shareware: Software that is available for free for a limited trial period. After the trial period, you are required to pay a fee to continue using it.

Example: Some antivirus software.

Open Source: Software that is available with its source code, allowing users to modify and distribute it freely.

Example: Linux operating system, LibreOffice.

Commercial: Software that is sold for a profit. It is typically proprietary and comes with restrictions on usage and distribution.

Example: Microsoft Office, Adobe Creative Suite.

Why it matters in SA: Understanding licensing models is crucial for legal and ethical software usage, especially in small businesses that need to manage costs.