User discussion forum for items related to technology in general.
Sun Sep 02, 2012 11:29 am
How much free space is needed in an OS partition on a SSD for good performance? I've seen figures ranging from 0% to 25% of the partition size. I suspect many of these figure are anecdotal.
Sun Sep 02, 2012 12:47 pm
I just go by the amount of data moving around -- make sure there's enough free space to easily handle the largest files being copied repeatedly, for example. You want the drive to be ready to quickly receive the data. I usually don't like the Windows partition getting under 10GB free and that's probably still fine for Windows on a SSD.
Sun Sep 02, 2012 2:52 pm
Paul, my OS partitions aren't that large.
I have a test 12.6 GB Win7 partition with 2.42 GB of free space. I copied and resized this partition so it was 10.2 GB with 0.98 GB of free space. I did the Windows Performance Index on each. The Data Disk Transfer Rate in the former was 7.7 and in the latter was 5.9. I had 16 GB of unallocated space remaining on the SSD. So the amount of free space in a partition does make a difference.
I've seen some views stating it doesn't matter if the free space is inside or outside the partition. They say a SSD with an 80 GB partition (that is 100% full of data) and 20 GB of unallocated space performs as well as a 100 GB partition which contains 20 GB of free space. My short experiment makes that view unlikely.
Sun Sep 02, 2012 3:30 pm
On Sun, 2 Sep 2012 14:52:34 PDT, just as I was about to take a herb,
Brian K disturbed my reverie and wrote:
>Paul, my OS partitions aren't that large.
I'd keep an eye on your temp files folders. The amount of crud that
can accumulate is amazing.
We may not be able to prevent the stormy times in
our lives; but we can always choose whether or not
to dance in the puddles (Jewish proverb).
Sun Sep 02, 2012 3:47 pm
> I'd keep an eye on your temp files folders. The amount of crud that
> can accumulate is amazing.
No problems there. My temp files/folders aren't in the OS partition.
Sun Sep 02, 2012 4:11 pm
With a small partition you won't be copying/writing large amounts of data. I don't think I would go by just the Performance Index value, though.
I haven't retested mine since I installed it. Might be interesting to see how it's doing since I've restored several times. [Just tested it and it's still says 7.8, same as before.] I haven't moved anything off of mine. The page file, temp files, etc. are all still on the SSD.
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