Getting to know Storage Media 1 Stores information

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

The Diskette is a magnetic storage Space/Size/Capacity = 1. 44 MB Write Protect tab Read only Or Read and write

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

The Hard Disk Storage Space/Size/Capacity = 160 / 320 / 500 GB Or even 1 TB! (Tera. Byte)

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

The DVD Storage Space/Size/Capacity = 4. 7 GB http: //electronics. howstuffworks. com/cd. htm

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

Units to Measure Computer Data • • • The smallest unit for data is bit. 1 bit stores only 2 values These 2 values are “ 1” or “ 0” “ 1” and “ 0” are called the Binary Code Computers store data using the binary numbers ( 1 s or 0 s). Binary code is the system of representing text or computer processor instructions by using "0" and "1". http: //computer. howstuffworks. com/

Binary Code for The Alphabets : : Capital Letters : : Small Letters

More Units Bit (b) Byte (B) Kilobyte (k. B) Megabyte (MB) Gigabyte (GB) Terabyte (TB) BIG UNIT Unit 1 B k. B Size 8 b x 1024 B 1 MB 1 GB 1 TB 1024 k. B 1024 MB x 1024 GB x X • • • SMALL UNIT

More Programs Running, More Main Memory? Demonstration for use of CPU and use of main memory • • Press CTRL+ALT+DEL > Choose Task Manager. Start to open 1 program at a time. What do you observe? • Answer: WB P 10 Q 3 The CPU’s usage increases for a while before it drops. Then the memory usage increases. • 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.

Let’s find 2 software from www. cnet. com > Downloads 1. You do not need to install/download software. 2. Find a software that you like. 3. Click on it. 4. Find out how much storage space is required. 5. Jot down the software name and its required space on WB P. 12. 6. Repeat these steps to obtain one more software. 7. Which software takes up more space? 8. Circle the storage space that is higher.

How do you know how much disk space you have used? At My Computer, Right-click on C:

Keep Diskettes Away From?

CD-ROM with a dry cloth