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Scandisk is a diagnostic program which checks for incomplete files. It is usually run after a power interruption. Defrag is a program than reshuffles the data on the disc to collect together the fragments of files into larger chunks. This minimises the amount of time taken to read the files in the future.

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15y ago
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14y ago

Fragmentation is when data on a hard drive is broken up on on the hard drive platter. More pieces cause the system to slow when trying to retrieve all the pieces to make up the data your trying to access. De-fragmentation is when the pieces are put back into bigger chunks and/or relocated nearer to each other.

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Q: What is the difference between scan disk and disk fragmentation?
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