Windows Legacy OS forum

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disk defragment

When I try to do a disk defragment I get a warning that my E drive only has 12% free space, and I need 15% to do a defrag. Then it asks if I would like to continue. I have tried several times, but always cancel before running the defrag. Do I ahve anything to worry about, or should I just go ahead and run it?
Thanks,
Mark

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Why must you do this?

In reply to: disk defragment

It's something of a mystery why there is less payoff today but let's skip to why you need 15%.

Let's say the biggest file on the E drive is 15% of the volume. To defragment that file the MS Defrag program may need that much space to copy the file to. While some could argue a smarter defrag program could do with just spare cluster then we get to discuss why MS's defrag isn't so smart?

So why not forget about it and enjoy your machine?
Bob

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Re: disk defragment

In reply to: disk defragment

If you cant free up space and want to defrag anyway, you could download a free trial version of third party defraggers like Diskeeper which are said to defrag with lesser than 15% free space.

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No problem with it.

In reply to: disk defragment

There is no problem with attempting to defrag with less than 15% free space. Whether the XP defragger will do much under those conditions is a different issue.

Do a disk cleanup and you maybe able to recover some more free space. Disk cleanup can be accessed in My Computer by right clicking on the relevant drive.

The 15% free space requirement is probably due to the fact that the $MFT + allocated zone is approximately 15% of the disk partition. (Closer to 12.5% actually). The XP defragger is unable to move the fragments of a fragmented $MFT, although the API has the functionality. So, I am guessing that the 15% minimum was sort of an insurance against having to deal with the $MFT yet being able to attempt to defrag the other files.

If you want to reliably defrag in less than 15% free space, you'll need to look at one of the commercial defrag utilities such as Diskeeper 2008. It can move $MFT fragments as well as defrag in low space.

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sorry.

In reply to: No problem with it.

er, incomplete sentence. I meant to say
"Disk cleanup can be accessed in My Computer by right clicking on the relevant drive and choosing Properties". There is an option for disk cleanup there.

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