>I guess the solution then would be to boot from a floppy and run the
>defrag program from the floppy. You would probably need to put the program
>on the floppy or on some other partition that is not the one you need to

that would be my suggestion if you are really intent on doing this.
i think the real solution would be to figure out whats going on rather
than shooting in random directions and possibly injuring an innocent
bystander when aiming for a specific problem.
give us some more details, and we'll try to help you figure it out...
do you have a lot of memory?  how much swap do you have?  what is a
typical workload, and  does the disk typically grind or only sometimes?
is there a pattern to the grinding, does it happen at certain times
(on the hour, once daily, etc).  and how full are your various filesystems?
(see below)
has it always happened, and any other info you think to be relevant, would
be useful.

>defrag. I have also heard that ext2 filesystems don't need to be defragged
>and I have never found it necessary either but I guess it can't do any
>harm to try it.  

the only reason ive ever needed to defrag an ext2 filesystems was when it
was running at near 100% usage for a long time.  the non-contiguous %
climbed up to over 20, and a defrag really did help perceived performance.
the real solution is to run at 90% or less full...
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