1. Getting to know Storage Media 1.Stores information 2.Retrieve information for later use

2. The Diskette is a magnetic storage Storage Space/Size/Capacity = 1.44 MB Write Protect tab Read only Or Read and write

3. The Zip Disk uses magnetic material too! Storage Space/Size/Capacity = 250 MB

4. The Hard Disk Storage Space/Size/Capacity = 160 / 320 / 500 GB Or even 1GB!

5. The CD-ROM Storage Space/Size/Capacity = 700 MB

6. The DVD Storage Space/Size/Capacity = 4.7GB http://electronics.howstuffworks.com/cd.htm

7. The USB Flash Memory / Thumbdrive Storage Space/Size/Capacity = 2 or 4 GB

9. Units to Measure Computer Data The smallest unit for data is Bit. 1 Bit stores only 2 values 2 values “1” or “0” It is called the Binary Code http://computer.howstuffworks.com/

11. More Units Bit (b) Byte (B) Kilobyte (kB) Megabyte (MB) Gigabyte (GB) UnitSize 1B8 b kB1024 B 1 MB1024 kB 1 GB1024 MB BIG UNIT xx x X SMALL UNIT 

12. More Programs Running, More Main Memory? Demonstration for use of CPU and use of main memory. The amount of memory used by a program increases with the program’s activity The amount of memory used increases with more programs being opened. The CPU’s usage increases for a while before it drops. Then the memory usage increases.