Bulk Tape Eraser

On Tue, Jun 18, 2002 at 11:26:45PM +0100, Tony Duell wrote: AC makes a field that alternates its direction with constant peeks. Moving the degauser away while it is running makes a field with degreasing peeks. This is needed to actually degaus the media. Switching the degauser off when it is near the media leaves the media in a gaused state, possibly gaused in a way that a drive gets confused or can't reformat the media. You need the alternating and degreasing field to bring the hysteresis down to zero. If you think of a magnetic hysteresis curve, you need a field that produces a hysteresis curve that looks like a spiral. I.e. alternating with degreasing amplitude. You can see this well when a monitor is degaused. -- tsch??, Jochen Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/