Storage.

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Presentation transcript:

Storage

What is binary? We use the decimal (base 10) number system Binary is the base 2 number system Ten different numbers are used in base 10. How many are used in base 2?

Bits & Bytes kilo, mega, and giga are different in binary! bit (b) – binary digit Byte (B) – 8 binary digits (bits) KiloByte (KB) – 210 bytes MegaByte (MB) – 220 bytes GigaByte (GB) – 230 bytes

Storage Scam! Example: iPod Nano 8GB

ON-OFF-ON-ON 1 0 1 1 Several ways to remember the state of a switch: 1 0 1 1 Several ways to remember the state of a switch: Electrical – RAM, flash memory Magnetic – Hard drives, magnetic tapes Optical – CDs, DVDs

Transistors (electrical) Electrical switches http://www.ee.byu.edu/cleanroom/MOSFET_calc.parts/14.jpg http://www.emeraldinsight.com/fig/0870270302001.png

Hard Drives (magnetic)

CD/DVDs (optical) Lands and pits used to represent binary Optical medium - lasers and refraction used to read lands and pits http://www.stereophile.com/images/archivesart/Magicfig1.jpg