Computer Storage Fundamentals: Drives, Memory, and File Systems
Storage Units and Drive Allocation
Physical and Logical Storage Devices
- Physical Drive Storage Device Hardware: Hard Disk (HD), Reader, Recorder, Pen drive, etc.
- Logical Drive Storage: The method used to access a physical drive.
Windows Drive Letter Allocation
Standard allocation of letters in Windows:
A:andB:: Floppy drives (Diskettes).C:: Primary Hard Drive partition (often containing the OS).D:: Subsequent Hard Disk partition or CD/DVD Reader/Writer.E:: Second Reader/Writer (used for mounting images
HVAC/R System Installation: Soldering, Brazing, and Evacuation Methods
Soft Soldering Techniques
Soft soldering is performed at temperatures between 190°C and 260°C, always below 500°C. The most commonly used filler materials are 50/50 tin/lead and 95/5 tin/antimony. The heat source for this type of joining is typically a butane gas torch.
Soft Soldering Operations
- Clean the junction thoroughly.
- Apply the flux to the male connection.
- Attach the connection piece to the tube.
- Heat the joint and apply solder.
- Dry and ensure the joint is very clean.
Brazing (Hard Soldering)
Read MoreEssential Metalworking Techniques and Tool Usage
Fundamentals of Metals and Metallurgy
Metal Properties and States
Solid elements are metals at room temperature, except mercury, which is liquid.
Metallurgy is the set of processes and techniques involved in the production of metals and alloys.
Key mechanical properties include:
- Hardness
- Elasticity
- Tenacity
- Malleability
- Ductility
- Mechanical Strength
Classification of Metals
- Ferrous metals: Are those containing iron.
- Non-ferrous metals: Do not contain iron.
Basic Metalworking Operations and Tools
Tracing and Layout
Read MoreEssential Properties of Paper and Ink for Cartography
Paper and Ink: Features for Cartographic Mapping
This document details the general features and characteristics of paper and ink used in mapping and printing processes.
Paper Composition and Fiber Sources
Paper is a felted fabric, formed by fine, very short woven threads or fibers. These are typically vegetable fibers. Until the mid-19th century, they were made of cotton, flax, and hemp. At present, wood plant fibers are used, such as low-density eucalyptus or conifer species like pine, or plants like
Read MoreClassical Greek Architecture: Temples, Orders, and Urban Design
Greek Architecture: Policy and Political Expression
The greatest monuments and major creative activities are related to prominent figures of politics, indicating that architecture reflected the vicissitudes of political history and became an expression of it. The great building activity of Greek civilization responded to:
- The existence of powerful material resources provided by mobility, trade, and migration.
- The political will of its leaders, reflecting the conception of life.
Urbanism and the Greek
Read MoreSemiconductor Devices: Fundamentals of Doping, Transistors, and Rectification
Doped Semiconductors and Energy Band Theory
Why Impure Semiconductors (Doping) Are Necessary
- Pure (intrinsic) Si/Ge have very low conductivity at room temperature.
- Doping adds controlled carriers, leading to practical conductivity and device action.
- n-type (Donors, 5 valence e⁻): Impurities like P, As, Sb create majority electrons.
- p-type (Acceptors, 3 valence e⁻): Impurities like B, Ga, In create majority holes.
- Doping is used to engineer essential devices like diodes, BJTs, JFETs, MOSFETs, and resistors.