zero fill utility

[anni]

Hi,
last week my seagate 400GB IDE disk crash due to bad sector, but later i recovered my most of the data using connected as
slave.
Now as my disk is under warrenty (only 6 month old), i want to send it for replace ment.
Before that i want to erase disk fully (zero fill)
I tried using seagate seatool dos utility and start full zero but it fail. may be because of bad sector
Any other dos based bootable utility which erase data fully.
or GUI, so that i can erase by connecting as a secondry disk
I already FULL format the disk, using window xp setup

[CA50]

you can try the tools that comes with UBCD]
UBCD