How do you stop the Ubuntu "wipe" (wiping an NTFS disk) in progress?

I didn't realise that the Linux wipe utility runs 25 passes by default. I'm wiping a 320 GB external disk drive, (it's about 25% into Pass 3 started around 4 PM yesterday, it's now 1 PM).

Can I just shut down the terminal window while wiping is in progress and not damage the drive?

Terminal>
root@name-pc:/home/name# sudo wipe /dev/sdc1
Okay to WIPE 1 special file ? (Yes/No) yes
Wiping /dev/sdc1, pass 0 (13) [19535616 / 19535616]
                  pass 1 (6)  [19535616 / 19535616]
                  pass 2 (24) [19535616 / 19535616]
                  pass 3 (32) [ 5097566 / 19535616]