If you use any software that enables you to delete partitions (PartitionMagic, or even Windows setup disk), after you delete it, the drive will be seen as non formatted and cannot be used until it is formatted (like when new). But the data that was on your drive can be 'recovered' by someone unless you go out of your way to remove it, which most people do with secure erase software.
Also there's the SMART data stored by the disk, i'm not sure if that can be erased by home users, but i know even less about that.
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