On 24 Aug 2004 at 1:16, Owain Sutton wrote:

>[quoting me, unattributed:] 
> > A small toll, one that is worth defragmenting every month or so or
> > after any major churning of your drive (such as an OS upgrade).
> > Also, one thing that makes a huge difference is how you partition
> > your drives. If you have a single drive partition for OS and for
> > programs and for data, then you're going to have more problems with
> > fragmentation than if you have a partition for your OS, a separate
> > partition for your programs and a third for data.
> 
> 
> My experience with various installs of XP suggests that unless the
> installer is savey enough to match the partitions to the physical
> structure of the drive, . . .

Eh? What are you talking about here?

If you've set the default program location to a different partition 
in the system registry, the installer will put the program files on 
the program partition, and perhaps a minimal number of files on the 
system partition.

> . . . separate partitions ensures that performance
> can never get above mediocre. . . .

That's not an XP issue. It's an installer issue. Installers shouldn't 
be writing any files to the Windows system folder -- it's just a 
wrong practice that no installer ever should have used.

> . . . There's little performance difference
> between a drive hunting all over the drive for one file, and shuttling
> between two disparate partitions to access two contigous files
> simultaneously.

What in the *world* are you talking about? No file is ever stored 
part on one partition and part on another, so fragmentation can never 
cross partitions.

> A separate *physical drive*, however, works wonders. Particularly when
> the swapfile is put onto it.

I think you are very confused about the subject of the conversation.

Separate partitions really *does* cut down on the amount of 
defragmentation, and as I described, is manageable at 3 different 
levels, system partition (OS), programs partition and data partition. 
If you put your temp folder, your IE temporary files (assuming you're 
dumb enough to be using IE) and your documents and settings folder on 
your data partition, the system partition will be written to very 
seldom, and only a small portion of it will be defragmented (unless, 
of course, you patch or upgrade the OS). The programs partition will 
fragment more than the system partition, because quite a few programs 
still store settings in their own folders (instead of in the correct 
location under the user's documents and settings folder). But the 
amount of defragmentation is slight. For both the system and programs 
partitions, the defragmentation will be in very small files, files 
that don't really matter. Once the drives are defragged, the big 
files will stay defragged, and that's going to be much more than 95% 
of the data on those drives (and it's going to be the big files that 
are the ones that drag down performance most when they are 
fragmented).

Thus, the only partition that should need regular defragging is your 
data partition, which is constantly being churned by use (and because 
all the dynamic data for programs and the OS is also stored on it).

Having multiple physical drives also improves performance, especially 
when you put all or part of the swap file on a different physical 
drive (as you suggest). But that issue is wholly orthogonal to the 
present topic of discussion.

-- 
David W. Fenton                        http://www.bway.net/~dfenton
David Fenton Associates                http://www.bway.net/~dfassoc

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