5 Questions
What is the full form of RAM?
Random Access Memory
Which of the following is an example of secondary storage?
Hard Disk
How much memory is required to store a 16-bit word?
2 bytes
What is the full form of ROM?
Read Only Memory
Which of the following is NOT a secondary storage device?
Monitor
Study Notes
Computer Storage
- Computer storage refers to the components and recording media used to retain digital data
- Two types of storage: primary memory and secondary memory
Primary Memory
- Also known as Main Memory or RAM (Random Access Memory)
- Temporarily holds data and applications while the CPU processes them
- Volatile: loses data when power is turned off
Secondary Memory
- Also known as External Memory or Non-Volatile Memory
- Permanently stores data even when power is turned off
- Examples of secondary storage devices:
- Hard Disk Drive (HDD)
- Solid State Drive (SSD)
- Flash Drive
- CD (Compact Disc)
- DVD (Digital Versatile Disc)
- Magnetic Tape
RAM and ROM
- RAM (Random Access Memory): temporarily stores data and applications while the CPU processes them
- ROM (Read-Only Memory): permanently stores data and cannot be changed or written by the CPU
- ROM is non-volatile: retains data even when power is turned off
Calculating Memory Needed
- To calculate the memory needed to store different words:
- 1 character = 1 byte
- 1 kilobyte (KB) = 1024 bytes
- 1 megabyte (MB) = 1024 kilobytes
- 1 gigabyte (GB) = 1024 megabytes
- Example: a 10-character word needs 10 bytes of memory
Test your knowledge of primary and secondary memory, RAM and ROM, and different storage units. Calculate memory needs and identify secondary storage devices.
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