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Introduction to Storage Devices

Introduction to Storage Devices. Storage Devices. Used to keep data when the power to the computer is turned off. Medium/media Location where data is stored. Hard Disk. Usually mounted inside the computer’s system unit. Can store billions of characters of data. Stated in forms of bytes:

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Introduction to Storage Devices

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  1. Introduction to Storage Devices

  2. Storage Devices • Used to keep data when the power to the computer is turned off. • Medium/media • Location where data is stored.

  3. Hard Disk • Usually mounted inside the computer’s system unit. • Can store billions of characters of data. • Stated in forms of bytes: • Megabytes, Gigabytes or Terabytes

  4. Magnetic Storage • Recording of data onto disks or tape by magnetizing particles of an oxide based surface coating. • A fairly permanent type of storage that can be modified. • Used by mainframe or microcomputers

  5. 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 or 1,440,000 bytes

  6. Solid-State Storage • Flash memory cards • Widely used in notebook computers • Used to record MP3 music files • Key chain hard drives • Key chain flash memory devices • Connects to a USB port

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

  8. 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, cannot be used to write data to a disk.

  9. 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.

  10. DVD • DVD ROM • Digital Video Disk which is read only. • DVD-R • Digital Video Disk which can be written to one time. It then becomes read only. • DVD-RW • Digital Video Disk which can be rewritten to.

  11. Blu-Ray Technology • New standard in storage • Blu-Ray • New disks use blue laser light instead of the red laser light used in traditional CD players • Disks may ultimately hold • Over 30GB on one-sided disks • Over 50GB on two-sided disks

  12. Flash or Jump Drives • External storage devices that can be used like a external hard drive. • They have the capability to be saved to, deleted from, and files can be renamed just like with a normal hard drive.

  13. Hot Swappable • A hot swappable device is one which can be replaced whilst the server is still in operation. • You should only hot swap components when the component and operating system supports it. • The following components can be hot swapped: RAM, disk drive, power supply, NIC, graphics cards. • Hot swappable components are more expensive. Often only necessary when you need to keep a server operational 24/7.

  14. List of Devices for Secondary Storage • Magnetic tape and disks • Compact Disk Read-Only Memory (CD-ROM) • Write Once Read Many - (WORM) • Magneto-optical disks • Redundant Array of Inexpensive Disks (RAID) • Optical disks • Digital Video Disks • Memory cards • Flash memory • Removable storage

  15. References • Computing Essentials 2005 • M. Guymon. Pleasant Grove High School

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