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I have a 900GB HDD, but for some reason it will only allow me to shrink like 2500MB of it. In the past, I could shrink to my desired size, but for some reason it is giving me a problem now. I have tried defragging it with PerfectDisk, but I actually think doing that made it even smaller. I have also tried using cmd diskpart but that fails too. Heres a pic:

Shrink C

Thanks for any help!

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There's an explanation in the middle of the box in the link you pasted that tells you what causes this and what to do about it. – David Schwartz Mar 6 '13 at 10:39
    
You are attempting to shrink a volume with files that are unable to be moved. You will need to get rid of those files ( its likely a page file ) before you will be able to do this. – Ramhound Mar 6 '13 at 12:44
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@Ramhound This can also be caused by 'unmovable' files, such as file system metadata. I believe the MFT mirror is created in the middle of the partition by default. The normal solution is to perform an offline resize using a tool that can move files and metadata, such as the Linux parted utility (often used with the gparted graphical interface). – Bob Mar 6 '13 at 13:11
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@Ramhound I am aware that they are using Windows. In my previous comment, I used a popular nix-based tool *as an example, though there are other methods. If desired, it is possible to use a Linux Live CD independent of the installed OS - Parted Magic is designed specifically for this purpose. It's important to note, however, that resizing a partition in this manner can lead to a loss of data. – Bob Mar 6 '13 at 13:48
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Possible duplicate of How to shrink Windows 7 boot partition with unmovable files – fixer1234 May 22 at 18:26

The answer here worked for me: How to shrink Windows 7 boot partition with unmovable files

Turn off Virtual Memory and System Restore, then run your shrink, then turn them back on again.

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