Unit 8

• What are peripherals?


  Devices that are separate from the basic computer (not the CPU, memory, or power supply)

  They are classified as input, output, and storage. They connect via ports
• Speed

  Measured by access time and data transfer rate

  Access time - Average time it takes a computer to locate data and read it

  Data transfer rate - Amount of data that moves per second
• Secondary storage devices

  ...

  • Solid state memory
  • Magnetic disks
  • Magnetic tape
  • Network storage
  • Optical disk storage
• What is a head crash?


  A physical defect with a disk drive that causes the read/write head to stop working

  Head - reads data off the disk as it rotates at a high speed
• What is a disk array

  Grouping of multiple disks