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Computer Performance & Storage Devices

Computer Performance & Storage Devices. Computer Technology Day 2 Notes. Computer performance. Windows Boot Processing Screen. Boot Process. Sequence of events that occurs between the time you turn on a computer and the time that it becomes ready to accept commands. Purpose

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Computer Performance & Storage Devices

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  1. Computer Performance & Storage Devices Computer Technology Day 2 Notes

  2. Computer performance

  3. Windows Boot Processing Screen Boot Process • Sequence of events that occurs between the time you turn on a computer and the time that it becomes ready to accept commands. • Purpose • Runs a diagnostic test to make sure everything is working • Loading the operating system, so the computer can carry out basic operations MAC Boot Processing Screen

  4. 6 Events of the Boot Process: • Power up • Start boot program • Power-on self-test • Identify peripheral devices • Load operation system • Check configuration and customization

  5. Circuits Close up of a circuit • The path from one component of a computer to another that data uses to travel. • Circuits run between • RAM and the microprocessor • RAM and various storage devices

  6. Silicon Chips • Silicon is melted sand • What the circuits are embedded into to keep them together. Circuit Silicon Chip

  7. Megahertz (mHz) • A measure used to describe the speed of the system clock. • A megahertz is equal to 1 million cycles (or pulses) per second. • 1.3 GHz means that the microprocessor’s clock operates at a speed of 1.3 BILLION cycles per second

  8. Pentium • Name of the CPU • Pentium is the 5th generation of the Intel processor • Other generations were called: • 80-88 • 286 • 386 • 486

  9. RAM vs. ROM (Memory) • Random Access Memory • The ability of a storage device to go directly to a specific storage location without having to search sequentially from a beginning location. • Very volatile (not dependable) • Cannot hold data when the power is off • Looses all data when power is lost • Read Only Memory • Drives can read data from disks, but cannot store new data on them. • One or more integrated circuits that contain permanent instructions that the computer uses during the boot process.

  10. Binary Number System{Base 2 Binary Code} • A method for representing letters or numbers using only two digits, 0 and 1 • Bit • Each 0 or 1 • Byte • 8 bits Bit Bit Byte

  11. Memory Measurements

  12. Used to keep data when the power to the computer is turned off. Storage devices

  13. Medium/Media • Location where data is stored Medium/Media Locations C: F: E: K: T: Z: Medium/Media Locations D: P: Y:

  14. Hard Disk • Usually mounted inside the computer’s system unit. • Can store BILLIONS AND TRILLIONS of characters of data. • Stated in forms of bytes: • Megabytes, Gigabytes, Terabytes

  15. Magnetic Storage • Recording of data onto disks or tap by magnetizing particles of an oxide based surface coating. • A fairly permanent type of storage that can be modified.

  16. Floppy Disk • Round piece of flexible Mylar plastic covered with a thin layer of magnetic oxide and sealed inside a protective covering. • May be referred to as a “floppy” • 3½ disk capacity is 1.44 MB

  17. Floppy Disk Options • Formatted • Preparing the disk for use by the computer. • Write-protected • Setting the disk so that it can not be written to by the computer

  18. ZIP Disk 100 MB Zip Disk • Floppy disk technology manufactured by Iomega • Available in 100 MB and 250 MB versions ZIP Disk 250 MB ZIP Disk Drive

  19. Digital Audio Tape • Method of storing large amounts of data on tape using helical scan technology to write data at high densities across the tape at an angle.

  20. Optical Storage • Means of recording data as light and dark spots on a CD or DVD • Reading (burning) is done through a low-power laser light. • Pits • Dark spots • Lands • Lighter, non-spotted surface areas

  21. CD-ROM • “Compact-Disk-Read Only Memory” • Also called CD-R • CD-Recordable • Storage device that uses laser technology to read data that is permanently stored on compact disks • Cannot be used to write (burn) data to a disk Use a CD-R if you DO NOT want someone to have the ability to change the data on it.

  22. CD-RW • “Compact Disk–Read Write” • A storage device that reads data from CD’s and also can write (burn) data to CD’s • Similar to a CD-ROM, but has the ability to edit. Look for the “RW” if you want to be able to EDIT your CD

  23. DVD-ROM • “Digital Video Disks-Read Only Memory • Reads data from CD’s (audio and data) and DVD’s (data or movie) • Cannot be used to write data to a disk. Stores more information than a CD-R or CD-RW

  24. Resources Parsons, June Jamrich, and Dan Oja. Computer Concepts. Boston: Course Technology-Thompson Learning, 2002.

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