getting to know storage media

Getting to know

Storage Media1. Stores information

2. Retrieve information for later use

The Diskette is a magnetic storageStorage Space/Size/Capacity = 1.44 MB

Write Protect tabRead onlyOrRead and write

The Zip Disk uses magnetic material too!

Storage Space/Size/Capacity = 250 MB

The Hard DiskStorage Space/Size/Capacity = 160 / 320 / 500 GB

Or even 1TB! (TeraByte)

The CD-ROMStorage Space/Size/Capacity = 700 MB

The DVDStorage Space/Size/Capacity = 4.7GB

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 ( 1s or 0s).• Binary code is the system of representing text or computer

processor instructions by using "0" and "1".

http://computer.howstuffworks.com/

Binary Code forThe Alphabets

::Capital Letters ::Small Letters

More Units

• Bit (b)• Byte (B)• Kilobyte (kB)• Megabyte (MB)• Gigabyte (GB)• Terabyte (TB)

Unit Size

1B 8 b

kB 1024 B

1 MB 1024 kB

1 GB 1024 MB1 TB 1024 GB

BIG UNIT

x

x

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 P10 Q3The 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 fromwww.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