Wiping with DD leftovers

[irongeek at irongeek.com (Adrian Crenshaw)]

Ive noticed something. If I use the Windows DD from
http://www.chrysocome.net/dd and use this command:

C:\Users\adrian\Desktop\aft>dd if=/dev/zero
of=\\.\Volume{de891b6a-8432-11de-86d4-005056c00008} bs=1M --progress

it seems to leave some data on the beginning (sometime) and end (always) if
the drive had  been formatted NTFS before.

I'm using WinHEX to verify by the way. Any ideas?

Adrian
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