[BBC-Micro] Re-using floppies

[Fred Cisin]

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.