Windows Defrag for Windows 7 and Puran for XP. I could only vote for one so I voted for Windows Defrag. Many people do not realize it but Windows 7's default install has defrag scheduled every Wednesday at 9am via Task Scheduler.
Always manual! Usually use CCleaner, then windows built in defrag tool, to ensure good tight tidy system images. have a good day -feandur
I just switched to SuperEasy Live Defrag...works good http://www.supereasy.net/en/usd/pin/0014/Products/SuperEasy-Live-Defrag
Any defragmenter with an option to keep each FOLDER AND SUBFOLDER CONTENT contiguous (and defragmented) for fast ACCESS ? As files may slowly drift out of the mold, the defragmenter would work in the background to regroup them.
O&O can be configured to defragment folders and it's subfolders but i'm not really sure if it would maintain it automatically everyday but you can set it up to defragment specific folders/files.
MyDefrag with Jaspion Scripts, which I developed. http://www.mydefrag.com/forum/index.php?topic=5843.0