Hi,

On Mon, Mar 7, 2011 at 4:33 PM, Lakshmipathi.G <lakshmipathi.g@gmail.com> wrote:
Hi -
I have an USB drive formatted as readonly ISO9660 . I need to reformat it . 

I used the dd command to write a string of 'zeroes' spanning the entire drive (which will take some time). Then formatted it appropriately. Check the man page of dd for the exact arguments. 

Worked fine for me, check if it suits you. 
--
Gaurav Menghani