Topic: Storage Devices, Boot Process, and Failure Diagnostics

❓ Essential Question

How do storage systems and the boot sequence work, and how can technicians diagnose failures when a device won’t start correctly?

⭐ Key Ideas

• Storage failures follow predictable patterns.
• The boot process involves multiple steps and handoffs.
• NVMe, SATA, and eMMC devices fail differently.
• Understanding error states prevents bad troubleshooting.

🔑 Vocabulary

POST (Power-On Self-Test) — Hardware check before boot.

Bootloader — Small program that starts the OS.

UEFI — Modern firmware that replaces BIOS.

NVMe — Fast PCIe-based storage device.

SATA SSD — Slower, cable-based device.

eMMC — Soldered flash storage used in Chromebooks.

Bad Blocks — Corrupted sections of a drive.

SMART Data — Health information for SSDs/HDDs.