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Two Ways to Extend Partition in Windows 10 without Data Loss

  • Contents:

    A real case:

    "I hope someone can help. Since upgrading to Windows 10, I have had to keep extending the primary partition, now the partition is up to 250Gb but almost full. I have free capacity on another partition, from which I have been taking spare capacity with any problems so far, but the partition tool Disk Management won't let me take any more. Would appreciate any/all suggestions to extend partition Windows 10".
    --from tenforums

    The above real case introduces you low disk space issue on partition in Windows 10. In this post, I will give you some solutions to this issue in detail.

    Windows 10 Partition Is Almost Full

    Due to the advantages of Windows 10 including Cortana, hologram technology and more, many of you choose to upgrade to Windows 10 from Windows 7/8.1 for a good user experience. After a period of time, more and more data are saved on your partition, and the data occupy much disk space. Although the hard drive you use is relatively big, it is most likely that your hard drive is almost full or only C drive is running out of space. Here let’s take system partition as an example.

    When there is no disk space, you will find your partition bar gets red. Sometime Windows will prompt you a specific message "You are running very slow on disk space on local disk (C:). Click here to see if you can free space on this drive". When low disk space warning happens in your PC, you will most likely encounter one or more situations which are listed below:

    • Your computer runs very slowly.
    • You probably fail to store large files or folders to the hard drive.
    • If there is no enough disk space, perhaps some of your needs can’t be met, for example, system upgrade, program or software installation.

    So, what should you do if system partition or other partition is running out of disk space. How to free up some disk space to extend partition Windows 10?

    Two Ways to Extend C Drive Windows 10

    Generally speaking, there are four main methods to help extend system partition in Windows 10. Keep reading, and try the following ways now.

    solution 1 Solution 1: Extend C Partition Windows 10 on Same Disk

    In order to ensure your partition C has enough disk space, you should choose to expand it if there is some free space on other partitions. But how to achieve this aim? Read on please. And I will introduce you three free tools to help know how to increase partition size in Windows 10.
    run 1 Run MiniTool Partition Wizard to Extend System Partition Windows 10

    In the partition management software market, there are many kinds of tools. And among them, there is an excellent program – MiniTool Partition Wizard which is developed by MiniTool Solution Ltd. It is worthy of being recommended since it is popular with more than 15,000,000 users. This program has five editions, including Free Edition, Professional Edition, Server Edition, Enterprise Edition and Technician Edition. Among these five editions, Free Edition is available in Windows 10/8/7/XP/Vista PCs with many powerful functions, such as resize partition, extend partition, format/wipe/copy partition, rebuild MBR, do partition recovery and more.

    Before you start to extend system partition in Windows 10, you need to download its Free Edition.

    Then let’s look at how to extend partition Windows 10 in two cases:

    Case 1: When there is unallocated space adjacent (it can be at left side or right side) to your system partition in Windows 10.

    Step 1: Launch MiniTool Partition Wizard Free Edition, then go to the main interface. Select system partition C, then select "Move/Resize Partition" from the action pane.

    Step 2: Then in the pop-up window, drag the black arrow to occupy the unallocated space. Here "Using Enhanced Data Protecting Mode" is checked by default and it can protect your data when sudden power outage happens.

    Step 3: Finally click "Apply" to perform system partition extension operation.

    resize windows 10 partition

    Case 2: When there is no unallocated space next to system partition in Windows 10.

    Here, Its "Extend" feature enables you to expand partition by taking free space from any other existing partitions or unallocated spaces on the same disk.

    Let’s see detailed steps to finish extending C drive successfully:

    Step 1: Please select the Windows 10 system partition and click "Extend Partition" function from the left pane. Also it is OK to right click on C partition and select "Extend" feature.

    extend partition windows 10

    Step 2: Then, choose to take free space from a partition or unallocated space and drag the sliding handle to decide how much free space to take. After that, click "OK" to go back to the main interface.

    free up space

    Step 3: Now you can view the partition is enlarged, but this effect has not been applied to computer, so you need to click on "Apply" button to execute all changes.


    use disk Use Disk Management to Extend Partition Windows 10

    In addition to using a third-party program, perhaps some of you choose to use Windows Disk Management tool which has two basic features "Extend Volume" and "Shrink Volume". They are useful to increase or reduce partition size. Nevertheless, when trying to extend volume, sometimes you may fail to do a job with the features, but sometimes you can extend or shrink partition successfully, not knowing the reason.

    When you open this free tool and right click C drive, you will view Windows 10 Extend Volume greyed out so you can’t extend volume in Windows 10, just like the picture shows below.

    extend volume greyed out

    Do you know the reason? In fact, it is due to the limitation of Disk Management. Here are two points you should pay attention to:

    1. The unallocated space must be on the same disk, and it must follow the system partition. That is to say, Disk Management only can extend a primary partition with contiguous unallocated space on the right side (logical partition with free space).
    2. The partition you want to extend should be in NTFS or RAW file system, otherwise, extend volume greyed out issue in Windows 10 will appear.

    Tips: If you want to extend data partition and there is an empty disk followed, "Extend Volume" is available. During the process, you will receive a message telling you to convert the selected basic disk to dynamic disk to expand partition in Windows 10. However, some operating systems don’t support dynamic disks.

    convert to dynamic disk

    run diskpart Run Diskpart to Extend C Drive Windows 10

    In addition, there is another tool named diskpart which also enables you to manage your disk and partition in some aspects, such as extend volume, format volume, convert to NTFS, clean disk and more. In order to extend Windows 10 partition, some of you may choose diskpart. Please run CMD as administrator, type "diskpart" to launch this tool. And then type the following commands and each one ends with "Enter" key:

    "list disk"
    "select disk n": n is the number of the target disk.
    "list partition"
    "select partition n": n refers to the partition number on the target disk.
    "extend size=x disk=n": x means a specific number of the unallocated space or free space on the target disk you want to use, and x is in MB unit.

    However, if there is no unallocated space, you cannot extend volume in Windows 10. A virtual disk service error "there is not enough usable space for this operation" probably happens.

    can't extend partition windows 10

    In this part, I introduce three partition managers to help extend partition for Windows 10. By using them, you will find MiniTool Partition Wizard can help to increase partition size well without any limitation and it can solve Windows 10 can’t extend partition issue. Compared to Disk Management and Diskpart, it has more powerful functions in partition or disk management, so it should be strongly recommended.

    solution 2 Solution 2: Extend Partition Windows 10 with Another Hard Drive

    In addition to the above three ways, you also can choose to upgrade to a bigger hard drive to extend partition on Windows 10. MiniTool Partition Wizard provides you two features:

    Copy Disk: This mode is designed to clone the entire disk including system data and other partition data to another big disk. If all partitions on the source disk are almost full, you should choose this mode and then increase all partition size by using the free disk space on the destination disk after finishing disk copy.

    note Tips:
    • Disk copy adopts sector-by-sector mode.
    • The target disk must be larger than the used disk space on the original disk.
    • Ensure that no data is saved on the target hard drive, otherwise, all data on this disk will be destroyed.

    If you want to know how to copy disk, please watch the visual video below:

    Migrate OS to SSD/HD: This feature enables you to move your system partition files as well as system related files to SSD/HD to make a backup. Besides, you also can perform such an operation to extend your system partition in Windows 10 with another big disk. This feature is suitable if you only want to extend C drive but there is no enough disk space on the rest partitions of the same disk. How to do this work?

    Step 1: Launch MiniTool Partiton Wizard, and then clcik "Migrate OS to SSD/HD Wizard" in the left pane after selecting the source disk.

    migrate os

    Step 2: Then you also need to choose a taget disk which must be larger than the used disk space of the source disk. Also please ensure there are not any important data on the target disk.

    select target disk

    Step 3:Next select a copy method from the "copy options" according to your need. You can check "Force to align partition to 1MB" which can improve your PC performance according to your destination disk.

    choose copy method

    Step 4: Then you will go to a window where MiniTool Partition Wizard will tell you to change boot order in BIOS to boot from the destination disk.

    Step 5: Finally clcik "Apply" to execute this OS migration operation.



    Suggestions to Reduce the Possibility of C Drive Full

    Method 1: Empty Recycle Bin

    As you know, in Windows, there is a built-in icon which is called Recycle Bin that usually locates in desktop. As a temporary storage place, it is used to temporarily store some deleted files or folders. More specifically, when you delete a file of folder you don’t need on your PC, the file is not deleted permanently and it is just put to Recycle Bin. In this case, you can choose to free up some disk space from Recycle Bin if you have deleted some files. Right click on "Recycle Bin" and then select "Empty Recycle Bin" from the menu. However, this way can only increase a bit of disk space because large files or folders won’t go to Recycle Bin and they will be directly deleted.

    Method 2: Run Disk Cleanup

    Windows owns a snap-in utility called Disk Cleanup which enables you to free delete some old and unnecessary files.

    1. In Windows 10, type "disk cleanup" in the search box to launch this free tool.
    2. Here please select your partition you want to do partition cleanup, (take C as an example). Then click "OK" to continue.

    clean old system files

    3. Then check the files you want to delete, and click "Clean up system files". From the following screenshot, you can see this clean tool will free up to 6.1GB of your system partition.

    free c disk space

    note Note:
    If your system is upgraded to Windows 10 from Windows 7 or Windows 8, there will be a Windows.old folder which probably occupies much disk space. So you also can use this tool to remove this folder to free up much disk space to extend Windows 10 partition after finishing the upgrade.

    These two ways are suitable for daily disk cleanup. If you want to get more disk space, you need to extend C partition in Windows 10 by taking some free disk space from other big partitions with MiniTool Partition Wizard.

    Bottom Line

    In this post, we mainly talk about low disk space issue on Windows 10 partition, and how to extend partition in Windows 10. You can choose any of the two solutions that is most available to you. Among those methods, MiniTool Partition Wizard helps a lot to increase Windows 10 partition with its powerful features, for example, extend partition, resize partition or migrate OS to upgrade to a big disk. If there is any suggestion, welcome to leave a comment below.