1. Check your volume shadow copy storage (system restore & previous versions), recycle bin and pagefile
<< Volume Shadow Copy >>
You can check your volume shadow copy with the following steps:
- Right click on Command Prompt
- Click on Run as administrator
- Type in the command: Vssadmin List Shadows
<< Pagefile >>
You can view or modify the pagefile settings as follows:
- Launch sysdm.cpl from the Start menu search or run box (Win+R)
- Navigate to Advanced –> Settings –> Performance –> Advanced –> Change. From this screen you can change the paging file size, set the system to not use a paging file at all, or just leave it up to Windows to deal with—which is what I'd recommend in most cases.
2. Perform Disk Cleanup
- Right click (C:) click Disk Cleanup
- Click More Options
- Click Clean up for System Restore and Shadow Copies
3. Download Windirstat ( http://windirstat.info/ ) to discover the allocation of your hard disk space.
References:
1. Windows has hidden about 40gb of hard disk space?
http://forum.notebookreview.com/windows-os-software/258364-windows-has-hidden-about-40gb-hard-disk-space.html
2. Understanding the Windows Pagefile and Why You Shouldn't Disable It
http://lifehacker.com/5426041/understanding-the-windows-pagefile-and-why-you-shouldnt-disable-it
3. Hidden file taking up 70Gb of disk space, even showing hidden system files does not reveal what or where it is.
http://answers.microsoft.com/en-us/windows/forum/windows_vista-performance/hidden-file-taking-up-70gb-of-disk-space-even/d114f350-1ac3-4a2e-8404-aee237046862
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