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Defragmentation targets how files are laid out on a storage device. On hard disk drives, data is read by a mechanical head that moves to different physical locations on spinning platters. When a file’s blocks are scattered across the disk, the drive must seek between many locations, which slows reads and writes. Rearranging the file so its blocks sit next to each other reduces the movement of the head, allowing data to be read sequentially and improving performance, especially for large or heavily fragmented files.

Solid-state drives have no moving parts, so access time is already fast and consistent regardless of where data sits. Reordering data on an SSD doesn’t yield the same speed gains and can cause unnecessary wear from extra writes, so defragmentation is not typically beneficial and is often discouraged.

RAM and cache memory are volatile, fast-access resources used by the CPU. They don’t store long-term file layouts in the same way as disks, and defragmentation isn’t a applicable optimization for these types of memory.

So the device that typically benefits from defragmentation is the hard disk drive.