Orientation to Computing — I

Unit 1: Computer System

From transistors to RAID arrays — understand every component inside a computer, why it exists, and how Indian companies spec their servers, workstations, and data centres.

🏢 Industry-Aligned | 📝 15 MCQs (Bloom's Taxonomy) | 🔬 5 Lab Exercises | 💼 Interview & Career Prep

Section 1

Why This Chapter Changes How You Think About Computing

Every app you've ever used — Instagram, PhonePe, Google Maps — runs on physical hardware. A CPU processes your UPI payment. RAM holds your WhatsApp messages while you type. An SSD stores your photos. A GPU renders your BGMI game. Understanding these components isn't optional knowledge for a B.Tech student — it's the vocabulary of every tech interview, every server room, every cloud console.

When a TCS interviewer asks "Why is your application slow?", they're not expecting "I don't know." They're expecting you to reason: "Is it CPU-bound? Memory-constrained? Disk I/O bottleneck? Network latency?" That reasoning starts here, in this chapter.

🏢 Industry Snapshot — Who Uses This Knowledge Daily?

ISRO (Indian Space Research Organisation) — Every satellite mission runs on radiation-hardened processors with carefully chosen RAM and storage. ISRO's Chandrayaan-3 landing computer used a specially configured processor that had to survive extreme temperatures. Hardware selection is literally rocket science.

Flipkart — During Big Billion Days, their servers handle 15,000+ orders per second. Their cloud infrastructure team specs servers with exact RAM, SSD, and CPU configurations on AWS EC2 instances. Wrong spec = crashed sale = ₹100 crore lost.

TCS (Tata Consultancy Services) — India's largest IT company. Every new hire goes through hardware architecture training in their first month. They manage servers for banks (SBI, ICICI), airlines (Air India), and government portals (Aadhaar, IRCTC). You WILL spec hardware in your career.

🇮🇳 ISRO🇮🇳 Flipkart🇮🇳 TCS🇮🇳 Infosys🇮🇳 DRDO🇮🇳 Zerodha

Prerequisite Checklist ✅

✅ You've used a computer (desktop, laptop, or smartphone) — that's your only prerequisite
✅ Basic awareness of what "storage" and "memory" mean in everyday language
✅ Curiosity about what's inside the device you're reading this on right now
✅ No prior technical knowledge assumed — we define every term from scratch

The computer in your pocket is more powerful than the ones that landed humans on the Moon. Apollo 11's guidance computer had 74 KB of memory and ran at 0.043 MHz. Your ₹12,000 smartphone has 4 GB RAM (54,000× more) and runs at 2,000 MHz (46,500× faster). Understanding hardware makes you appreciate how far we've come — and where we're going.

Section 2

Learning Outcomes — Bloom's Taxonomy

Bloom's Level	Learning Outcome
L1 — Remember	List the types of RAM (DRAM, SRAM, DDR4, DDR5), ROM (PROM, EPROM, EEPROM), and cache levels (L1, L2, L3) with their key characteristics
L2 — Understand	Explain why SSDs outperform HDDs for OS boot and database operations, and why HDDs still exist for archival storage
L3 — Apply	Read a real computer specification sheet (from Amazon/MD Computers) and identify every component, its role, and whether the spec is appropriate for a given workload
L4 — Analyze	Compare RAID 0 vs RAID 1 vs RAID 5 for a hospital's medical record server and identify the optimal trade-off between speed, redundancy, and cost
L5 — Evaluate	Justify a storage and processor selection for a given use case (e.g., college server, ML workstation, gaming PC) with cost-performance reasoning
L6 — Create	Design a complete hardware specification for a realistic use case — including CPU, RAM, GPU, storage, RAID, and interfaces — with a budget and written justification