Why is a fragmented disk slower than one that is defragmented?

Kto rozmawia z clamentain przez krótkofalówke w the walking dead w 4 epizodzie

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Johnson enterprises uses a computer to handle its sales invoices. lately, business has been so good that it takes an extra 3 hours per night, plus every third saturday, to keep up with the volume of sales invoices. management is considering updating its computer with a faster model that would eliminate all of the overtime processing.