Shared Flashcard Set

Details

Storage
N/A
16
Computer Science
12th Grade
04/25/2013

Additional Computer Science Flashcards

 


 

Cards

Term
Reasons for storing data
Definition
  • Basic setup information & operating systems are required for the computer to function
  • Application software needs to be available for the user to carry out tasks
  • Files created by user needs to be stored so that they can be used again
  • Data may need to be transferred from one device to another
  • Backup copies need to be taken in case the original files are lost or have become corrupt
Term
Types of storage
Definition
  • Internal & External
  • Magnetic
  • Hard Disks
  • Floppy Discs
  • DAT tapes

 

Term
Internal & External Storage
Definition
  • When a personal computer boots up, uses data stores in ROM to load BIOSto make the computer work
  • Then it loads operating software from hard drive
  • As well as immediate storage capcity (ROM & RAM), computer needs backing storage for mass storage of data & programs
  • Personal computers make use of a variety of removable media

 

Term
Magnetic Storage
Definition
  • Hard Disks
  • Floppy Discs

 

Term
Hard Disks
Definition
  • Day to day storage on PC systems is carried out by the hard disk
  • Made up of rotating plastic/metal disks covered with magnetic coating on which the data is stored
  • Available with very large storage capacity at a relatively low cost
  • Fast to read, extremely reliable & robust
  • If one drive fails, the other automatically take over & data remains available available for the network to use without any network down time
Term
Floppy Discs
Definition
  • Were once extremely popular
  • Only holds 1.44 MB of data - no longer a pratical storage method
  • Easily damaged & not very reliable
Term
DAT Tapes
Definition
  • Small in size but can hold a lot of data
  • Often used to backup servers because they are easy to take away & store at a diiferent location to server
  • Quite slow to write to & very slow to retrieve data
  • Less reliable than hard drives & more difficult to restore selected files from
  • Useful removable backup medium
Term
Optical Storage
Definition
  • CD-ROMs & DVD-ROMs
  • CD-Rs & DVD-Rs
  • CD-RW & DVD-RW
  • Burning data usually needs special software that formats the disc & copies the data
Term
CD-ROMs & DVD-ROMs
Definition
  • Read only
  • Often used to supply software 
  • No further data can be written to them
Term
CD-Rs & DVD-Rs
Definition
  • Data written to them once 
  • Storage space cannot then be overwritten with new data 
  • Useful for backing up files & making archive copies that are unlikely to be needed but should not be thrown away altogether
Term
CD-RW & DVD-RW
Definition
  • Can have data written to them many times
  • Used to transfer data between machines
  • They are reusable, but most people find flash drives are more convienent for this 
Term
Flash Memory
Definition
  • Used for portable devices (e.g. digital cameras, MP3 players, mobile phones & satelliate navigation systems)
  • Popular for transferring data between machines 
  • Most operating systems will recognise the drive 
  • Increasingly being used as the main storage medium 
Term
Online Storage 
Definition
  • The increased upload & download speeds made it possible by broadband internet connection = people can store their data away from their computer
  • Some photograph printing companies offer sites where users can store their photographs
Term
Removable Storage
Definition

Need to think about:

  • The volume of data to be stored
  • The reason data is being stored
  • Whether data will need to be rewritten
  • Speed of recovery
  • Physical size of device
Term
Transferring Files
Definition
  • Email attachment
  • Instant message service
  • Flash Memory
  • Optical discs
  • Removable hard drives
Term
Back Up
Definition
  •                 Storage medium needs to be extremely reliable (tape drives, optical media & extra hard drives)
  • Floppy dics are too small to consider
  • Flash memory is not usually considered because it is vunerable to damage
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