Learn: Why Computers Need Secondary Storage

Welcome!You've already learned about primary storage like RAM and ROM, and how virtual memory uses secondary storage when RAM is full. Today, we'll explore why computers need secondary storage and its importance.

What is Secondary Storage?Secondary storage refers to devices or media used to store data permanently, even when the computer is turned off. Examples include hard drives, SSDs, and USB drives. It is important because primary storage like RAM is volatile and temporary.

Why is Secondary Storage Needed?Computers need secondary storage to save files, programs, and operating systems permanently. Without it, all data would be lost when the computer is powered off. Secondary storage also provides much larger capacity compared to RAM.

Types of Secondary StorageThere are three main types of secondary storage: optical (e.g., CDs), magnetic (e.g., HDDs), and solid state (e.g., SSDs). Each has unique characteristics for speed, durability, and cost.

Capacity and SpeedCapacity refers to how much data a storage device can hold, measured in KB, MB, GB, or TB. Speed refers to how quickly data can be read or written. Solid state drives are faster than hard drives but typically more expensive.

Comparing Secondary Storage TypesEach type of secondary storage has trade-offs. For example, magnetic drives are cost-effective but slower, while solid state drives are fast but expensive. Choosing the right storage depends on the requirements for speed, capacity, and budget.

Review Time!Great work! You've learned about secondary storage, its importance, types, and characteristics. Now let's test your understanding with a few questions.