You need to use the erase command to remove the data off of the tape.
example: 
load the tape
mtx -f /dev/sg3 load slotnum [drive number]
tell the drive to erase the tape
mt -f /dev/nst0 erase

Make sure you are using the right devices by running the mtx inquiry. 
[root@baculaserver ~]# mtx -f /dev/sg3 inquiry
Product Type: Medium Changer
Vendor ID: 'DELL    '
Product ID: 'PV-124T         '
Revision: '0075'
Attached Changer: No

The correct devices should be listed in your bacula-sd.conf file. 

On Mon, 2010-08-02 at 16:20 +0200, Holikar, Sachin (ext) wrote:
> Hello,
> 
> Thanks for your reply. Yes upgrade is a MUST and is in a planning stage.
> 
> Yes I will not use the faulty tape anymore but as you said , if I use delete 
> option to delete the volume tape totally, even though Bacula finds all the 
> jobs on that tape , deletion will remove all the data contents on it. So data 
> loss without any inconsistencies. Am I correct?
> 
> 
> Thanks,
> Sachin Holikar 
> 
> -----Original Message-----
> From: John Drescher [mailto:drescherjm AT gmail DOT com] 
> Sent: Montag, 2. August 2010 14:43
> To: Holikar, Sachin (ext)
> Cc: bacula-users AT lists.sourceforge DOT net
> Subject: Re: [Bacula-users] Bacula Tape replacement
> 
> > We are using Bacula 2.2.7.
> 
> 
> Please upgrade. That is over two years old and will not be supported
> for bug fixes ... anymore.
> 
> > The problem is, a tape in one of the working pools gets I/O errors whenever
> > tape library tried to access it.
> > I could see that tape has some data on it. Now I wish to replace this tape
> > with a new tape with new name. (As I feel, using new name would not make
> > much difference or would  it?).
> >
> > Please correct the proposed steps :
> >
> > Add new tape in the library.
> > Move the tape and move it into one of the empty slots.
> > Label the tape to the respective Volume Pool.
> >
> The last step. A label barcodes will do. Ignore that bacula will ask
> about every tape in the library. Bacula will only label tapes that are
> not labeled. I generally at this step put the tapes in the Scratch
> pool.
> 
> > Now please state the steps to purge the susepcted tape. I would like to
> > transfer the data on this tape onto the new tape.
> > As I do not wish to break the data consistency within the volume pool.
> > Correct me if I am wrong here.
> >
> If you are totally getting rid of that tape never to use it again.
> delete volume
> 
> if you want to try to use it again
> purge volume
> 
> Both commands find all backup jobs on that volume and purge the jobs
> even if the job started on a different tape.
> John
> 
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