Definition of Memory The process by which we acquire, store, and retrieve information.
Getting to know Storage Media 1.Stores information 2.Retrieve information for later use.
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Getting to know Storage Media 1. Stores information 2. Retrieve information for later use
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Transcript of Getting to know Storage Media 1.Stores information 2.Retrieve information for later use.
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 1GB!
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
• 2 values “1” or “0”
• It is called the Binary Code
http://computer.howstuffworks.com/
More Units
• Bit (b)• Byte (B)• Kilobyte (kB)• Megabyte (MB)• Gigabyte (GB)
Unit Size
1B 8 b
kB 1024 B
1 MB 1024 kB
1 GB 1024 MBBIG UNIT
x x
x
X
SMALL UNIT
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.
