When you delete a file, it isn't immediately erased from the flash. The controller periodically "cleans up" by moving valid data to new blocks so it can wipe the old ones, keeping the drive ready for future writes . Why the Choice of Controller Matters
While the NAND flash chips do the physical work of storing your files, the controller is the specialized microcontroller that manages everything else. Without it, those flash chips are just a collection of digital "drawers" with no one to organize the socks. What Does an SSD Controller Actually Do? SSD CONTROLLER
When you buy a solid-state drive (SSD), you probably look at two things: how much it can hold and how fast it says it is. But there’s a hidden "brain" inside every drive that determines if it actually hits those speeds—the . When you delete a file, it isn't immediately