olemus
kettasisu ümberkorraldamine killustuse minimeerimiseks

Wiktionary:
defragment, verb
(computing) 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

ülevaateid
https://en.wikipedia.org/wiki/Defragmentation

http://downloads.condusiv.com/pdf/Best_Practices_for_Eliminating_Fragmentation.pdf

https://www.usenix.org/system/files/conference/hotstorage16/hotstorage16_ji.pdf