Flash disk

[Margo]

Hi

Background:

When I first installed Fedora I plugged in my flash disk and nothing 
happened. I worked on this for 3 days and then finally realised that the 
usb ports weren't working at all. I have since changed the MB and they work.

So. Flash disk no 1 now works.

Unfortunately Flash disk No 2 got formatted as fat32 to see if that 
would make it work before I found out the usb ports weren't working.

When I plug it in n ow, it's picked up as a flash disk (good) however 
the filesystem comes up as unknown or not recognised.

I have searched everywhere to find out the command to reformat the disk 
as vfat in linux... perhaps its too basic a command to be in any faq. 
Can anyone help.

Margo