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You could try keeping the existing partitions but changing the partition type and reformatting them? That may work.
Alternatively, if you have linux, you could try zeroing the drive and then recreating partitions. Something like
dd if=/dev/zero of=/dev/sdXXXXX bs=16M count=100
(replace the XXXX with the drive letter and remove count=100 if you want to zero the whole drive).
Make sure you don't wipe your main drive!!!
A safe way would be to get a bootable linux CD, disconnect all your other hard drives before booting and then wiping the drive.
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