Чо за полумеры?

Скинь все потоки на одно ядро. Отключи (программно) памяти кусок.
Переведи проц в режим экономии.

Вредитель блеать.

Вот те мсдна кусок:

To defragment a file, use the following steps:

1. Use the FSCTL_GET_VOLUME_BITMAP control code to find a place on the volume large enough to accept the entire file. If necessary, move other files to make a place that's large enough. Ideally, there will be enough unallocated clusters after the first extent of the file that you can simply move subsequent extents into the space after the first extent.
2. Use the FSCTL_GET_RETRIEVAL_POINTERS control code to get a map of the current layout of the file on the disk.
3. Walk the RETRIEVAL_POINTERS_BUFFER structure returned by FSCTL_GET_RETRIEVAL_POINTERS. Use the FSCTL_MOVE_FILE control code to move each cluster as you walk the structure. You may need to renew either the bitmap or the retrieval structure, or both, from time to time as other processes write to the disk.

Дебил блеать тупой.

https://documentation.help/MyDefrag/SeeAlso-MyFragmenter.html

Для тестирования дефоагментаторов есть даже специальная утилитка - фрагментатор.

Буся дебила кусок.
Не удивлюсь если Буся 1Сник!