LaCie Hard drive won't mount on Desk top

[sredhead]

I tried to overwrite a LaCie external HD with zero's using Disk Utility but cancelled the process soon after it started due to the 7 hours shown for the process. Now the LaCie disk doesn't show in Disk repair or on the desk top. Is there anyway to mount this hard disk?

I tried to find some free disk mount program but can't.

Any help would be welcome.

Thank you