WindHydra

Did you clean old windows files? I ran into similar problem and had to reinstall windows http://forum.piriform.com/index.php?showtopic=46106

After Win7 upgrade the windows.old folder deletes fine, both manually or with Disk Cleanup (tried on 2 computers). Yes I tried cleanmgr after reset, but it only managed to partially clear the folder (~1GB left behind). CCleaner only managed to removed an additional 5mb according to ccleaner summary, but the computer became unbootable afterwards. There might be system files in the folder which shouldn't be touched.

Did you tried deleting the folder before? I had similar problem and had to download Win10 installation usb again. http://forum.piriform.com/index.php?showtopic=46106 Hope someone can confirm this.

It appears that clearing the windows.old folder in Windows 10 could break the system if you have performed "reset this PC" before. After running "reset this PC", the windows.old folder cannot be deleted (unlike when upgrading from windows 7), probably due to linked files? I tried deleting the folder manually (it worked when it was upgraded from Windows 7) but it didn't work. After restart, CCleaner tried to clear windows.old, but only managed to delete ~5mb of files out of almost 1gb, then the computer won't boot after restart. Can anyone confirm this?

It's set to auto, now using 400MB with 20k+ files. I think it's caused by loading the directory structure from MFT, because if I run folder properties on the cache folder before ccleaner, it loads a lot faster. Clearing the cache works, but I want to keep the cache. If I move the cache folder away then run ccleaner, it's fast. But it's slow again if I move the folder back in. What's the new cache backend? I tried adding browser.cache.use_new_backend in firefox 26 and it doesn't seem to work.

When loading ccleaner, there's high disk activity when firefox cache is large, even when I unchecked everything in the applications tab (seems like ccleaner still loads the directory structure from $mft). Is there a way to change this? Maybe a way to remove firefox from the applications tab?

Might be system restore. I heard that it uses Volume Shadow Copy and tracks changes made to the disk. When data gets moved around during defrag it'll try to keep track of the changes, using up lots of space. Try turning off System Restore (which will delete all the restore points though) before defrag. Personally I think System Restore is useless. It works well when you are restoring for fun, but when I really needed it it didn't work

When the $MFT file is moved, the mft reserved zone is reallocated after drive dismount/mount. If there is empty space available right after $MFT, windows will make it MFT reserved zone. The size of the zone is between $MFT and the next file or 12.5% of the drive (default), if the free space is large enough. I would like to suggest adding an Option that limits the reserved zone size by leaving x ~ y MB of freespace after the $MFT file. 10 ~ 20 MB, for example, will only vacate space if the reserved zone drops below 10 MB. Treat the reserved space as freespace for the calculation by the way. Or maybe an option to ignore the MFT reserved zone during defrag? On some drives the defrag might have gone a lot faster if Defraggler could use the large MFT reserved space when the nonreserved space is too small.

I see. So you mean Defraggler works on the larger file first? Or are you talking about Defraggler puts larger files at the beginning of the drive? Anyway, I tried running free space defrag and it does NEITHER. Defraggler did not defrag the large files first, nor did it move the largest file (2 gig on that drive) to the front. And as for consolidating free space, Defraggler is probably not your best choice. You should try jkdefrag, which seems to be the best freeware at free space defrag.

I'm pretty sure defraggler doesn't sort by file size. At least get your fact straight when you complain about something being crap. And 850 file totaling 100 MB? Don't tell me you are trying to defrag a flash drive... I hope you know that defragging flash drive makes ZERO speed difference and every time you write to flash drive it gets damaged.

Large fragments probably have small impact on reading speed, so I think it'll be useful to have an option to ignore FRAGMENTS (instead of files) larger than a user defined size. BTW, currently I just check the files smaller than a certain size when defragging, so it'll be useful to have the option to ignore file size too

jkDefrag is set to defrag all drives by default, starting with C. You need to add launch commands if you want to start with another drive. Auslogics doesn't explain what it do. I didn't like it when I tried last year. Defraggler on the other hand just defrag selected files, easy to understand And its fast stop function when defragging huge files is really useful.

You probably have some system restore program running, like System Restore in XP or vista. I think they track changes in the layout of the drive, so if you defrag, it will try to keep track of all the changes, maxing the restore backup size and erasing old restore points if it can't track all the changes.

Maybe the file is not fragmented. Maybe you should try analyzing with Window's defragmenter and see if that file is fragmented.

You need to defrag the whole drive. After it defragged the files it will go on to free space.