amiga floppy disk reading experience

On 10 Jun 2010 at 15:46, Eric Smith wrote: What I was trying to say, but in a rather roundabout way. Given that most common floppy data separators can accommodate at least a +/- 10% variation (or more) in long-term speed variation, a too-slow drive can easily write a sector that's way out-of-spec timing-wise on a track that's otherwise perfectly in spec. It's necessary that any read algorithm be able to adjust to short-term (sector-to-sector) variations, as well as long-term (track to track) ones. Given that you *know* the structure of a track ahead of time, there should be no reason that your data recovery routines can't be *much* better than the usual brain-dead floppy controller's efforts. Ethan Dicks wrote: Heh, there are a couple of other systems that do that (Commodore didn't invent it). I've got an 8" hard-sectored floppy sitting on my desk here, where the data for cylinder 9, complete with address ID is duplicated on cylinder 3. Apparently there's no "look before you write" in whatever wrote it. --Chuck