If I'm reading it right.....that's a 1 Terabyte drive! Right?
That's one HUGE drive! Do you have it partitioned and what type of Format are you using on it?
I've tried several different brands of Defrag Programs over the years and almost every time I've wound up with a drive that was corrupt. Either DON'T defrag it at all, or use the built-in Windows Defrag. It's by far the safest, even if it's not the fastest.
Unless you're saving files over 4 gigs in size, FAT-32 is the most versatile format for a data only drive. It can be read on any computer, with any OS, even DOS.
Another way I've found to defrag a drive, even "C" is to make a backup "Partition to Image" file of the drive and then do a Restore of the image.
I do that on my own C drive every week after I've done my weekly backup.
The Restore rewrites the partition with the data from the image file, all in the order in which the files were originally read, (sequentially) with NO spaces between files and NO fragmentation.
The result is a drive that looks something like this:
Link Removed due to 404 Error
Yes, this is my XP drive, formatted FAT-32. The blue area is the re-written data and the green is the new pagefile, written on the first boot after the Restore.
Your mileage may varry, but my point is that the best way to defrag a data drive is to copy it to another drive or media and then (reformat is optional) copy the data back. It will be written in sequential order without spaces or fragmentation.
We did that on the big mainframe computers years ago. It works great!
I hope all this rambling has helped some. We Old Timers tend to do that sometimes.
Happy Trails........
Old Timer