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it seems to me that it would make sense to put your swap partition on the first cylinders. Most people do not fill up even 25% of their disk, so the heads spend most of their time in that particular portion of the disk. Putting your swap on the outside cylinders means the arms have to sweep across the disk to access swap and then back to read data.
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To a minor point I would have to agree to this... Though the speeds that drives run at these days it would be minor but it is still related as to why you would use a separate partition or drive.
I do want to mention that 10.1 has made amazing strives to cut down on the need for VM. only in extreme low ram situations does it dip into this and I am sure that it will get better and better yet to come.
also one other thing I fail to mention earlier... If you DO decide to move your swap you will need to redo the /etc/rc edits every time you upgrade your OS.
So if your not into tinkering this could be a reason not to bother. Further if your machine has 64 megs of ram to 128 megs of ram you will not be able to avoid using the swap and in machines like this no matter how or where you place the swap you will not see dramatic speed improvements. Just a little more to think about.
Cheers