I don't know if the Boot Optimize Function is actually the cause of my background unscheduled defrags but it's the only reasonable explanation I've been able to find. I've had problems with my system freezing after it goes into idle mode i. I'd appreciate hearing from anyone who can confirm that the Boot Optimize Function will trigger unscheduled defrags when Vista is idle or knows if the Boot Optimize Function is of any real benefit if you use a third-party defragger.
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I'm not certain, but this idle-time WDD defrag seems to runs for longer periods after I perform a full disk defrag with Defraggler and I'm wondering if this "silent" WDD defrag is relocating of some of the system files on my hard disk after Defraggler finishes its full disk defrag. Well, there is something about optimizing layout of boot files using Prefetch data. It can be disabled. Imacri is apparently seeing the prefetch defrag. In the prefetch folder is a text file called Layout.
At three-day intervals, when the pc has been idle for at least 10 minutes, Windows invokes its defragger to defrag the files listed in Layout. This is all done by default, although it could be disabled if one should so wish.
Aethec's link pointed me to something I wasn't aware of, that Windows XP onwards does a boot-time defrag as well as and separate from the prefetch defrag. I've looked, and it's enabled on my box and has been doing its stuff for years without me noticing. PF prefetch file and not all those application files found in Layout. That would be sensible. My instinct says that the boot files would be not changed very often, or in my case hardly at all, as I don't modify my machine's boot behaviour at all, or very rarely.
PF is included in Layout. So one could turn off the boot-time defrag and perhaps speed up boot time a fraction. On the other hand, does defragger look at the files at boot-time, discover that they are already defragged, and ignore the command, in which case stopping it would have negligible time gain.
All these questions. Disabling that allows third party defrag tools less work, and less moving around of files, i. Thanks to everyone for the excellent feedback. I followed up on the replies to my original post and found an article in the MSDN library see Disabling Disk Defragmentation that indicates that there are at least two registry changes required to disable "silent" idle-time Windows defrags at least in XP :.
According to this article, the disk defragmentation service rearranges data on the disk to create contiguous sections of data, while the the auto-layout service moves the most-used data closer to the center of the disk to expedite boot time.
A second article on the Microsoft TechNet see Disk Defragmenter Tools and Settings has more detailed information about the BootOptimizeFunction key and states that "Windows automatically optimizes the file location for boot optimization.
This optimization occurs automatically if the system is idle for 10 minutes. Boot optimization improves startup time by locating startup files in contiguous clusters on the volume, reducing the movement of the disk head when reading the volume. It sounds to me like this "silent" Windows idle-time defrag is designed to reduce boot times, so I'm not going to do any registry hacks until I get a definitive answer from Piriform.
Given that this background Windows defrag by dfrgntfs. I'm concerned that Defraggler and Windows use different algorithms to optimize the location of boot-up files and constantly shuffle these files around my hard drive drive.
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