how we measure memory
DESCRIPTION
How We Measure Memory. Learning Goal. Today we are going to learn how the computer stores information. At the Bottom of things. A piece of digital information is always stored as a sequence of binary states. What is a “binary state”???. A microscopic view of a CD. Electrical Memory. - PowerPoint PPT PresentationTRANSCRIPT
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How We Measure Memory
![Page 2: How We Measure Memory](https://reader036.vdocuments.net/reader036/viewer/2022062408/56814039550346895daba7dd/html5/thumbnails/2.jpg)
Learning Goal
Today we are going to learn how the computer stores information.
![Page 3: How We Measure Memory](https://reader036.vdocuments.net/reader036/viewer/2022062408/56814039550346895daba7dd/html5/thumbnails/3.jpg)
At the Bottom of things
• A piece of digital information is always stored as a sequence of binary states.
What is a “binary state”???
![Page 4: How We Measure Memory](https://reader036.vdocuments.net/reader036/viewer/2022062408/56814039550346895daba7dd/html5/thumbnails/4.jpg)
A microscopic view of a CD
![Page 5: How We Measure Memory](https://reader036.vdocuments.net/reader036/viewer/2022062408/56814039550346895daba7dd/html5/thumbnails/5.jpg)
Electrical Memory
• RAM, Memory Sticks, Memory Cards all store information as sequences of negative or neutral charges.
• The two states are negative and Neutral
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A “bit”
A bit of information is a single binary state.
For example:
• “on” or “off”
• “pit” or “land”
• “negative” or “neutral”
• “dead or “alive”
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“A Byte”
There are 8 bits in a byte.
A byte can hold a single character. Ex: ‘A’
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A “Kilobyte” (Kb)
A Kilobyte is 1024 bytes or 210. (or about 1000 bytes)
You would measure an Email in Kb.
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A Megabyte Mb
A megabyte is 1 048 576 bytes which is 220. (Or about 1 million Bytes)
Mp3s and digital pictures are usually 2-5 Mbs.
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Gigabytes (Gb)
A Gigabyte is 1 073 741 824 bytes or 230 or about 1 billion bytes.
We measure RAM, Hard drives, Memory cards in Gb.
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Terabyte
• A Terabyte is 240 which is 1 099 511 627 776 bytes
Large hard drives are measured in Terabytes.
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Beyond Terabytes??
Chart from Wikipedia.
![Page 13: How We Measure Memory](https://reader036.vdocuments.net/reader036/viewer/2022062408/56814039550346895daba7dd/html5/thumbnails/13.jpg)
Summary1.A bit is a single binary state.
2.There are 8 bits in a byte
3.There are about 1 000 bytes in a Kilobyte.
4.There are about 1 000 Kilobytes in a Megabyte
5.There are about 1 000 Megabytes in a Gigabyte
6.There are about 1 000 Gigabytes in a Terabyte