You can extend the partition to cover the whole disk using your favorite partition manager. GPARTED is a free download from http://gparted.sourceforge.net/livecd.php/ and so is the partition manager from easeus from http://www.partition-tool.com/
A month or so ago my main HD became corrupted to the point where I replaced it with another older and smaller HD that had at one time been a Master HD. After installing XP and sundry other programs, I noticed that this HD had been partitioned. I haven't used that partition for anything yet. The corrupted hard drive was made into a slave drive after reformatting but then it just seemed to disappear from My Computer. Also when it was visible it showed only 128GB of total space even though it was a 500GB HD. Then just today it showed up again in My Computer. When I looked at it in "Disk Management" it showed the following:
Slave - Internal storage
127.99 GB NTFS
Now what I would like to do is make this slave HD with just one partition for data collection . But I am not sure how to do this. Can someone help me with this?