auxiliary storage devices. 

Secondary storage or Auxiliary storage is a device that provides alternative long term storage for programs, data and information. 

They are regarded  as secondary since they are not accessed directly by the processor. Some of them are connected externally while others are mounted inside the system unit on the motherboard. They can be classified according to:
1. Technology 

Refers to the mode used to read or write data in them. They include magnetic, Optical, solid state, and magneto-optical.

2. Portability 

this is as whether the media is removable or fixed.

Removable media is that storage media which is not housed in the system unit therefore data is read and written on them using a special device called drive

Examples include: 

  • magnetic tapes 

Examples of magnetic tapes include reel to reel tape, cassette tapes, and cartridge tapes), floppy disk, 

  • Optical disk

These disks are commonly compact disk (CD), a few types of CDs include: 

  • compact disk read only memory-CDROM, 
  • compact disk recordable-CDR, and 
  • compact disk rewritable CDRW), solid state devices.

#accessing data from Magnetic tapes is slow due to the linear storage of data records on the tape. Also, the space between successive data records called inter record Gap (IRG) which results to wastage of storage space. 


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