defrag

/diːˈfɹæɡ/

IPA: /D IH0 F R AE1 G/

verb
  1. 1

    To run a process that collects fragments of files and sorts them into contiguous sections on one or more hard disks or hard disk partitions, thus speeding up file management.

Synonyms

Source: https://en.wiktionary.org/wiki/defrag, https://en.wiktionary.org/wiki/defragment