3 May
1999
3 May
'99
5:12 a.m.
CLASSICCMP(a)trailing-edge.com wrote:
The "rotate around at many different orientations" is also
important for a thorough degaussing. Unlike electric charge, which
doesn't have a direction, magnetization *does* have a direction.
Hi
Although there is a direction issue with magnetized materials,
I have found that simple DC type erasing works well on floppies.
I had similar problems when reformatting floppies for a different
type of machine. What I did to erase was to put the floppies on a
metal surface ( my refrigerator ) and then a piece of thin cardboard
( cereal box from on top of the refrigerator ). I used one of those
super magnets from a disk servo drives and just dragged it once
around the disk. I formatted it and it then worked without errors.
I know from my audio tape days that this tends to reduce S/N
but I also know that floppies tend to saturate so a slight DC
bias isn't so bad.
Dwight