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  • 1. Backing Storage Devices
  • 2. 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.  Purposes • Runs a diagnostic test to make sure everything is working. • Loading the operating system, so the computer can carry out basic operations.
  • 3. 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
  • 4. Circuits  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
  • 5. Silicon Chip Silicon is melted sand. The circuits are embedded into to keep them together.
  • 6. Megahertz (mHz)  A measurement used to describe the speed of the system clock.  A megahertz is equal to one 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.
  • 7. Pentium Name of the CPU. Pentium is the 5th generation of the Intel processor.  Other generations were called • 80-88 • 286 • 386 • 486
  • 8. RAM vs. ROM RAM  ROM  “Random Access Memory”  “Read only memory”  The ability of a storage device  Drives can read data from to go directly to a specific disks, but cannot store new storage location without having data on them.  One or more integrated to search sequentially from a beginning location. circuits that contain permanent instructions that  Volatile the computer uses during the • Cannot hold data when the boot process. power is off. • Looses all data when power is lost.
  • 9. Binary Number System  A method for representing letters or numbers using only two digits, 0 and 1.  Bit • Each 0 or 1  Byte • 8 bits  Also referred to as Base 2 Binary Code.
  • 10. Memory Measurements  Bit  Each 0 or 1  Byte  8 bits  Kilobyte  Approximately 1,000 bytes  Exactly 1,024 bytes  Megabyte  Approximately 1 million bytes  Exactly 1,048,576 bytes  Gigabyte  Approximately 1 billion bytes  Terabyte  Approximately 1 trillion bytes
  • 11. Storage Devices Used to keep data when the power to the computer is turned off. Medium/media  Location where data is stored.
  • 12. Hard Disk  Usually mounted inside the computer’s system unit.  Can store billions of characters of data.  Stated in forms of bytes: • Megabytes or Gigabytes etc
  • 13. Magnetic Storage A fairly permanent type of storage that can be modified. Recording of data onto disks or tape by magnetizing particles.
  • 14. Floppy Disk  Round piece of flexible 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 or 1,440,000 bytes
  • 15. 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.
  • 16. Zip Disk Floppy disk technology manufactured by Iomega in late 1994.  Available in 100 MB and 250 MB versions
  • 17. 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. Digital Audio Tape (DAT) is a recordable audio format conceived by the Japanese in mid 80’s
  • 18. Optical Storage Means of recording data as light and dark spots on CD or DVD. Reading is done through a low-power laser light.
  • 19. CD-ROM “CD – Read Only Memory” Also called CD-R  CD-Read Storage device that uses laser technology to read data that is permanently stored on compact disks.
  • 20. CD-RW “CD-Read Write” A storage device that reads data from CD’s and also can write data to CD’s. Similar to a CD-ROM, but has the ability to write to CD.
  • 21. DVD-ROM  “Digital Video Disks – Read Only Memory”  Reads data from CD’s (audio & data) and DVD’s (data or movie).