Did you check does your floppy drive support this kind of format capacity?

maybe with HD-Copy ? http://www.asiawide.or.jp/HD_COPY.htm

Hey thanks, will give that a try. I don't recall using any special tools to format the first one though, just FORMAT (from Freedos).

Some drives do not support older formats. I had the problem with my usb floppy drive.
The one I have, does not support 720 kilobyte, only 1.44 megabyte.
The only way I found out, was that I had a 720k disk, wich I wanted to format to see
if it had any bad sectors on it.

Yes, there are programs wich support formatting of other formats than just 1.44.
I have seen one, can't remember the name, that could format for mac using win.

EDIT:
Win-Image have support for different disk-sizes..... 😉

What kind of drive (internal or external) and what model?
My Usb floppy does not support 300K disks. 720/1.4 only

Figured it out already 😀 Turns out I had to configure it as 5.25" 360k drive in the BIOS to make it work.
I don't know how this works exactly but it doesn't make much sense to me: when configured as 1.44MB drive it will read and write 320k disks just fine... it just won't let me format them.

smeezekitty wrote:

What kind of drive (internal or external) and what model?
My Usb floppy does not support 300K disks. 720/1.4 only

It's an ALPS drive with "external" motor, I think it came from an IBM PS/2.
Slightly off-topic, but this is the best floppy drive I've ever had, very silent and reliable. If you have a floppy that throws read errors on most other drives, this drive will usually still read it.
In fact, you can stop the motor by hand, and even spin it backwards, and it will keep on reading without missing a bit 😀

Found some info on floppy disk drives, in general. This might explain why you needed to set it as an 5.25 inch drive.

http://en.wikipedia.org/wiki/List_of_floppy_disk_formats