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Tuesday, September 28, 2010

Storage Devices


Storage Devices
A storage device is a “hardware device designed to store information”. There are two types of storage devices used in computers; a ‘primary storage (internal)’ device and a “Secondary Storage (external)’ device.

Internal
External
(Primary Storage)
(Secondary Storage)
Backing Storage
RAM
Hard Disk
ROM
Floppy Disk
Register
CD ROM
Cache
Magnetic Tape

Features of Internal & External Storage Devices
  • Internal memories are faster than external memories.
  • Internal memories directly communicate with the CPU. Where as External memories must communicate to the CPU through the internal memory.
  • In general internal memories are temporary (except ROM) and External memories are permanent.
  • Internal memories more expensive than external memories.

Primary & Secondary Storage Devices
Primary: “A storage location that holds memory for short periods or overwritten”. For computer RAM is an example of a primary (Volatile) storage device.
Secondary: “A storage medium that holds information until it is deleted or overwritten”. For example of a secondary storage device. (Nonvolatile) 

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