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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
@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
@Bob - Based on the screenshot the user is unlikely using Linux/Unix since the application in question is a Windows application. As I went through some troubles with a HDD that started to fail, I discovered that the page file, was unable to be moved by the normal software I use to defrag my system. Of course when your HDD wants to attempt to place the page file in the one section of the disk with the problem it causes stability problems. – Ramhound Mar 6 '13 at 13:23
@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

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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