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Meaning of SCAN-EDF

 
Computing Dictionary
 
 Definition: 

A variation of the scan disk aceess algorithm for use in a real-time environment where, in general, requests are served according to earliest deadline first. If two requests share the same deadline, they may be reorganised according to Scan.

A typical example is a video server that retrieves video data from a hard disk. The playback of a video impose tight real-time constraints but if the server retrieves data once every second for each video channel, Scan-EDF can be applied, reducing the seek overhead.

 

 

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