Need help shrinking/extending a volume on my server

I have inherited a Windows 2008 domain controller that only has 40gb allocated to the system drive!  I am struggling with disk space and need to reallocate the space over the volume.
I have attached a screenshot of Disk Manager - you can see Disk 0 has C: (OS) and E: (datapart1)
I am trying to use that second partition (datapart1) to claw back space for the C: drive.
I have clicked on the shrink volume option and after some calculation, it tells me I can only shrink the volume by 8692MB - even though it has 818Gb free.
Two questions -
1. Why can I only shrink by this tiny amount?
2. Am I going about this the right way?

I don't mind paying for a partition product if that is going to be safer.

Thanks
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fuzzyfreakAsked:
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StampelCommented:
This tiny amount is due to the fact they are some data at the end of the partitions and windows does not care about moving this data before shrinking. It just want to shrink after the latest used extent.

EASEUS Partition Master can easily do this for you.
http://www.easeus.com/partition-manager/comparison/epm-pro.html
But you can find many others.
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Seth SimmonsSr. Systems AdministratorCommented:
Why can I only shrink by this tiny amount?

there is data that windows can't move and that's the amount it can shrink it to

Am I going about this the right way?

even if you could shrink the volume more, the free space will be at the end and will be non-contiguous which means that you can't extend C from there

partition master mentioned above should work for you

...and there is no screenshot
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fuzzyfreakAuthor Commented:
I am sorry, I am afraid I do not understand your explanation.
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fuzzyfreakAuthor Commented:
Oops, see screenshot attached.
shrink-volume.docx
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Seth SimmonsSr. Systems AdministratorCommented:
which part?
in your screenshot it says there are unmovable files which is why it can't shrink much
even if it did, the free space will be after drive E
the free space needs to be between C and E to extend C
that's why you need 3rd party utility since you need to shrink E in the opposite direction for C to extend
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fuzzyfreakAuthor Commented:
Thank you, I have now purchased a product.
I did not understand the bit about unmovable files - surely if there is 818gb of free space, you don't need to actually move files??
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Seth SimmonsSr. Systems AdministratorCommented:
if the files are fragmented, yes it would be scattered in different parts of the disk
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fuzzyfreakAuthor Commented:
OK, thanks!
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fuzzyfreakAuthor Commented:
Great answers, thanks
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