der Mouse <mouse at rodents.montreal.qc.ca> wrote: It's *supposed* to do a true LLF on a Classic HDD, but I very strongly suspect (close to certainty) that on modern drives it's a dummy, something like "write zeros to all logical blocks" as if by ordinary writes. They probably have stuff like embedded servo (a la RL02) and cannot be LLFed "from scratch", i.e., from a totally degaussed or misaligned state. MS