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Why does MyDefrag take so long to Fast Optimize?

Why does MyDefrag take so long to Fast Optimize?

From recommendations in other questions about defragmenters, I decided to try out MyDefrag. However I'm finding that the Fast Optimize script is running very slowly, specifically it seems to take a very long time over "Reclaiming the NTFS reserved areas" - and the interface implies that this is related to one of my Virtual PC vhd files.

Asked by: Guest | Views: 64
Total answers/comments: 2
Guest [Entry]

It did appear to be the vhd file that was causing the issue, having moved it off, performed a defrag and then returned it, all subsequent defrags have had no issues.
Guest [Entry]

"I recommend disabling optimization for virtual disks. It's simple to edit the MyDefrag scripts not to optimize specified directories, for example, where your virtual disk is.

I use VirtualBox and found problems getting it to recognize virtual disks after they'd been optimized by the host OS using MyDefrag. I also read elsewhere, sorry I don't have the reference, that virtual disk optimization in the host OS is not a good idea. The recommended approach was to optimize the Virtual Disk within the guest OS."