I have FS9 on my 'F' partition. Had it there for years with no problems. When I tried to Defrag it yesterday, I got this warning:"Volume 'F' has 11% free space,but only 8% is available for use by Disk Defragmenter(due to RESERVED SYSTEM SPACE). To run effectively, Disk Defragmenter requires at least 15% usable free space . There is not enough disk space to properly complete the operation. Delete some unneeded files on your hard disk, an then try again."I have 2 Gig of memory and I do NOT use a page file. Everything runs smooth practically all the time.Would appreciate any help or solution.Thanks.Abe

You need to make some room in your drive or partition. You can, for example, copy a big folder from F to another place in your hd, defragment, and then move it back in.For a more permanent solution, assuming it is a partition, you can rearrange a neighbouring partition to a smaller size and allocate the extra space to F, but you'll probably need a commercial program to do that. Regards,

Thank Vassillis.The point is, I never got a warning like that....never. I am trying to find out what program or anything else caused it."due to RESERVED SYSTEM SPACE"....Abe

Invariably with Diskeeper, it's referring to MFT. Although it might also be labelling System Restore files as `system` files.Hope this helps.Allcott

Thanks Allcott.I have System Restore disabled. I backup my partitions manually. And this only happened in my 'F' partition where FS9 resides.Abe

Hi Abe,Regardless of the warning Microsoft defrag WILL run. It is recommended to have at least 15% free disk space but I have had to ignore that warning a few times and it worked just fine. Once the defrag is completed you might have some more free space as well.Also a consideration is to use an external defrag program. I've used O&O defrag for a while now and like it a lot more then Microsoft's offering. There is a 30 day trail version (full and free btw.) on their website.Regards,Alex

Thanks Alex,I am glad to here that somebody else has experienced that warning too.I have defragged partitions with much less free space, but never did I get any warning like that. I suspected that some addon in my FS9 had created that.By the way, Alex, I do have O&O also and I do use it, of course without any warning. I just like to use Windows defragger once in a while.Thanks again, Alex.Abe