@TrickyDave:
To format a 720Kb disk from Windows XP, open a command prompt (Start / All Programs / Accessories / Command Prompt) and type the following:
format a: /t:80 /n:9(Note that this command works on previous versions of Windows and in MS-DOS)
If you're formatting a high density disk as low density, you'll need to find a piece of non-transparent tape (such as electrical insulating tape) and place it over the high density detection hole at the edge of the disk (e.g. the hole that
isn't the write protect tab). The reason for this is that HD drives use different electrical characteristics when writing to HD disks as they do when writing to DD disks.
Finally, don't use HD disks for long term storage of DD stuff as they're not reliable enough. Instead, get yourself some DD disks - they can still be bought, e.g. from
AmigaKit.
- Ali