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How We Measure Memory

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.

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How We Measure Memory

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  1. How We Measure Memory

  2. Learning Goal Today we are going to learn how the computer stores information.

  3. At the Bottom of things • A piece of digital information is always stored as a sequence of binary states. What is a “binary state”???

  4. A microscopic view of a CD

  5. Electrical Memory • RAM, Memory Sticks, Memory Cards all store information as sequences of negative or neutral charges. • The two states are negative and Neutral

  6. 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”

  7. “A Byte” There are 8 bits in a byte. A byte can hold a single character. Ex: ‘A’

  8. A “Kilobyte” (Kb) A Kilobyte is 1024 bytes or 210. (or about 1000 bytes) You would measure an Email in Kb.

  9. 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.

  10. 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.

  11. Terabyte • A Terabyte is 240 which is 1 099 511 627 776 bytes Large hard drives are measured in Terabytes.

  12. Beyond Terabytes?? Chart from Wikipedia.

  13. Summary • A bit is a single binary state. • There are 8 bits in a byte • There are about 1 000 bytes in a Kilobyte. • There are about 1 000 Kilobytes in a Megabyte • There are about 1 000 Megabytes in a Gigabyte • There are about 1 000 Gigabytes in a Terabyte

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