Windows 8 and 8.1 Forums


Can't shrink C partition in Windows 8.1 with diskmgmt

  1. #1


    Posts : 3
    Windows 8.1

    Can't shrink C partition in Windows 8.1 with diskmgmt


    I am trying to shrink C:\ with Disk Management so I can make room for another partition, however it says the max size it can be shrunk is 1,666 MB. But even if I try to shrink it by that much I get an error (pictures attached).

    What I have done to try and fix this issue:
    I figured I may need to defragment my drive but that has not remedied the issue.

    So I decided to do power down, remove my laptops battery, hold power for about 30 seconds, put the battery back in and power up again. This also has not remedied the issue.

    ----------------------------------------------

    I apologize if those measures were noobish and useless to fixing my issue, I have not ran into this issue ever and was not/am not sure what to do.

    I am new to windows 8 and am not sure if this is related to something that has changed since windows 7. Could it be related to secure boot or something called (U)EFI? (I need to do some reading on both of these)

    Does anyone have any ideas what may be preventing me for shrinking my C:\ drive and therefore creating a new partition out of the freed up space?

    Any and all help is greatly appreciated!
    Attached Thumbnails Attached Thumbnails shrinkableSize.PNG   Error.PNG  

      My System SpecsSystem Spec

  2. #2


    United States
    Posts : 3,093
    Windows 8.1 Pro 64-bit


    Probably because the partition has to be offline to do it. I've had to use third party partition managers to do it. EaseUS has worked for me but some have had it mess up their partitions, be sure to image before using it.
      My System SpecsSystem Spec

  3. #3


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    The partition is fragmented. You need to run defrag first to consolidate all free spaces then try again.
      My System SpecsSystem Spec

  4. #4


    Posts : 3
    Windows 8.1


    Quote Originally Posted by topgundcp View Post
    The partition is fragmented. You need to run defrag first to consolidate all free spaces then try again.
    The first solution I tried was defragmenting the hard drive but that did not fix it.
    If I run the program called defrag a cmd window pops up and disappears.
    The result of those actions is now I can only shrink it by 148MB
    Attached Thumbnails Attached Thumbnails Capture.PNG  
      My System SpecsSystem Spec

  5. #5


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    From Admin command Windows, run dfrgui. Hi lite C then Optimize

    Click image for larger version
      My System SpecsSystem Spec

  6. #6


    Posts : 356
    Windows 8.1 Enterprise


    1.) Your C partition is not at the end of disk.
    2.) data is spread across C partition.

    If you want to see how data is spread download Disk view from Microsoft sysinternals

    example of disk view:

    Click image for larger version

    If your disk does not look like the one above, you won't be able to shrink it.
    additional defragmentations might solve this.
      My System SpecsSystem Spec

  7. #7


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    If the solution suggested above does not work then download: Bootable Partition Manger | MiniTool Partition Wizard Bootable Edition
    then use: Rufus - Create bootable USB to create a bootable CD/USB. Bootup your PC, right click on C drive->Resize. Click Apply to commit the change from the top left corner.
      My System SpecsSystem Spec

  8. #8


    Posts : 156
    Windows 8.1 Pro 64-bit, Windows 10 64-bit


    You can try download the MiniTool Partition Wizard to shrink it. It worked for me when I want to extend the C: drive.
    Partition Wizard may need to reboot your PC to shrink your C: drive.

    Note: Backup your data before shrink or extend partitions/volumes.
      My System SpecsSystem Spec

  9. #9


    Posts : 879
    Windows 10


    Step One: Disk Cleanup - Open and Use - Windows 7 Help Forums

    Step Two: Partition or Volume - Shrink - Windows 7 Help Forums

    The size of the available shrink space can be restricted by the amount of space currently allocated to on the hard drive for the virtual memory page file, System Protection maximum storage space size, and hibernation files. The location of the files on the hard drive plays a big part here because these files are marked as unmovable, and Disk Management is unable to relocate them. As such, if these unmovable files are located in the middle of the total amount of free space on the disk, then only the amount of free space on the other side (to the right) of these files will actually be available for the new partition. This will result in you showing that you have x amount of free space, but not being able to use it for your partition. The only way around this is to use a 3rd party hard drive partition management program, or setup the partition when installing Vista.
    Note: If you have an OEM PC that came with Windows 8/8.1 preinstalled, you may not use the third-party partition software (for example, EaseUS Partition Master), because modifying the hard drive partition structure usually break the factory restore feature. But if you use Windows Disk Management to shrink the C: partition (see screenshots below), then Refresh and Reset should work.

    EDIT: This program does not break the factory restore feature: http://www.disk-partition.com/free-p...n-manager.html









    Last edited by genet; 23 Jun 2015 at 16:27.
      My System SpecsSystem Spec

  10. #10


    United States
    Posts : 3,093
    Windows 8.1 Pro 64-bit


    Genet, I forgot to mention that very important detail about OEM installs. I no longer have OEM or recovery partition so not an issue for me. Imaging is the best safety measure before messing with partitions, especially with any third party software.
      My System SpecsSystem Spec

Page 1 of 2 12 LastLast
Can't shrink C partition in Windows 8.1 with diskmgmt
Related Threads
I'm currently trying to increase the disk space on my computer. I know that you can shrink or delete unnecessary disk partitions, but I've never done it myself and I'm not sure which ones (other than C, of course) are safe to mess with: 59676 Three are labeled as recovery partitions, and one is...
Hi all, I'm trying to shrink my C partition so I can dual boot with Xubuntu. I attempted to do so using Disk Management, however, it only would allow me to shrink 556 MB which is obviously very little space. 57817 Admittedly my hard drive is quite small but I have 47GB free and am only...
I'm on an HP laptop running 8.1 (the laptop came with 8 and I updated through the app store). I want to shrink the C drive and extend the D partition that the machine came with. I learned from google that Windows can now shrink the C drive (which sounded awesome), but it only let me remove 40 of...
Just purchased a new win 8.1 computer. As you know it only has the system, recovery partitions and a very large C drive containing the OS and whatever programs that came with the computer. After cleaning up any unneeded programs, I would like to create 2 more partitions besides drive C: ...
Solved shrink C drive in Performance & Maintenance
Hi everyone, I've had a look around both here in 8Forums and general Googling, but what I've found is unclear and contradictory. I have a new HP Pavilion 15 e073sa laptop with a 750Gb HD. I would like to mimic my Win7HP setup on my old Toshiba laptop which is to partition the C drive to...
Can't shrink volume in General Support
Hi,I want to shrink my hdd but I get this error:there's not enough space available to complete this operation.
Hi everyone, I'm new on the forum and this is my first post. I'm having a hard time trying to create a partition on the main HDD, in order to perform a Windows 7 installation, since Windows 8 is giving me several compatibility problems, and many software developers (e.g. Adobe Systems) said to...
Eight Forums Android App Eight Forums IOS App Follow us on Facebook