On 22/03/2010 19:18, Alex Taylor wrote:
The idea was that reformatting a 1.44MB HD disk in a
DD drive will
leave traces of the original formatting behind (as they're always
preformatted for DOS/Windows), causing the unreliability. Using a bulk
eraser is meant to eliminate this problem, as it will turn them into
completely blank disks that can be formatted in a DD drive more
reliably.
In addition to all that, . . .
The coercivity (sorta like magnetic sensitivity) is WRONG.
"720K" diskettes are 600 Oersted.
"1.4M" diskettes are about 750 Oersted.
It IS close (unlike 360K (300 Oersted) v 1.2M (600 Oersted)), and it WILL
work (unlike 360K v 1.2M), but it will NOT be as reliable as using the
correct diskette.