The drive is big and it will take a long time.
My hard drive is 451 GB. Two days ago I tried defragging with Smart Defrag but it ended up taking so long. It had been running for six hours and was at just 31%. I uninstalled that and installed defraggler. I started that defrag at 2 AM December 10. I checked it at 8 AM and it was still running and was at 32%. I left for the day and returned at 4 PM and it was still running and it was still at 32%. I stopped it. What would cause it to run for so long and not finish? Thanks much.