Karmic: how to delete /dev/sr1

[Mirto Silvio Busico]

Hi all,
I have an external USB hard disk from Western Digital (model My Passport).

This unit comes with two partitions, that I see and I can mount:

    * /dev/sr1 that is understood as a CD
    * /dev/sdb1 that is a normal NTFS partition

If I mount the partitions "mount" says:

...
/dev/sr1 on /media/WD SmartWare type udf 
(ro,nosuid,nodev,uhelper=hal,uid=1000)
/dev/sdb1 on /media/My Passport type fuseblk 
(rw,nosuid,nodev,allow_other,blksize=4096)

The problem is tah I'm not able to destroy, eliminate, kill :-) the 
/dev/sr1 partition

With the partitions unmounted, nor "gparted" nor "fdisk" see the damned 
partition

Trying "sudo fdisk /dev/sr1" I see:

mirto at msb02:~/script$ sudo fdisk /dev/sr1
Impossibile scrivere la tabella delle partizioni.
Nota: la dimensione del settore è 2048 (non 512)
Il dispositivo non contiene né una tabella delle partizioni DOS valida, 
né una disklabel Sun, SGI od OSF
Building a new DOS disklabel with disk identifier 0x0c58531d.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.

Attenzione: il flag 0x0000 non valido della tabella delle partizioni 4 
verrà corretto con w(rite)

Comando (m per richiamare la guida): p

Disco /dev/sr1: 700 MB, 700448768 byte
255 testine, 63 settori/tracce, 21 cilindri
Unità = cilindri di 16065 * 2048 = 32901120 byte
Identificativo disco: 0x0c58531d

Dispositivo Boot      Start         End      Blocks   Id  System

Comando (m per richiamare la guida):


How can I kill this partition?


Thanks
    Mirto

P.S. BTW I use Karmic 64 bit with updates of 4 March




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