Learn: Why Computers Need Secondary Storage

Welcome!Great to see you back! You’ve already learned about primary storage like RAM, ROM, and cache. Today, we’ll build on that by exploring why computers need secondary storage.

What is Secondary Storage?Secondary storage refers to non-volatile storage used to keep data and programs permanently, even when the computer is powered off. It is important because primary storage like RAM is volatile and cannot retain data when the computer shuts down.

Why Is Secondary Storage Needed?Computers need secondary storage for tasks like saving files, installing software, and storing the operating system. Without it, every time you turn off your computer, all data and programs would be lost!

Types of Secondary StorageThere are three common types of secondary storage: optical (e.g., DVDs), magnetic (e.g., hard drives), and solid state (e.g., SSDs). Each type has different characteristics, such as speed, capacity, and cost.

Primary Storage vs Secondary StoragePrimary storage (e.g., RAM) is fast and used while the computer is running, but it is volatile. Secondary storage is slower but non-volatile, meaning it keeps data permanently.

Characteristics of Secondary StorageWhen choosing secondary storage, you should consider capacity, speed, portability, durability, reliability, and cost. Different devices and media are suited to different needs.

Examples of Secondary StorageImagine saving your school project on a USB stick (solid state) or backing up photos on an external hard drive (magnetic storage). These are examples of secondary storage in action.

Review Time!You’ve learned why secondary storage is essential and explored its types and characteristics. Let’s check your understanding with some questions.