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Removing unnecessary data from your hard drive allows the free space and remaining data to be defragmented more efficiently - there is not a lot of point in re-organising temporary/trash data. Removing the data after defragmentation will leave disparate 'holes' of free space amid the existing data, which can lead to further fragmentation when new data is written to the storage device.

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13y ago
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12y ago

Cleanup comes first before Defragmenter. Say, C comes first before D.

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13y ago

Disk Defragmenter will further fragment unneeded files on a hard drive.

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Q: Why should you run disk clean up before running disk defragmenter?
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