When you wipe a hard drive, or some other storage device, you erase everything that's currently on it, as well as anything you've previously deleted that might still exist.
Mgbe ị na- ehichapụ draịvụ ike, ma ọ bụ ihe nchekwa nchekwa ọzọ, ị na-ehichapụ ihe niile dị na ya, yana ihe ọ bụla ị ehichapụrịrị nke nwere ike ka dị.