EaseUS Partition Master

A simple partition tool to manage disk space in Windows 11/10.

  • MBR to GPT Converter, make Disk Ready for Windows 11.
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  • C Drive Cleaner & Windows 11 Performance Optimizer.
  • Rescue Data When Windows 11 Corrupts or Dies.
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How to Solve Windows 11 Update Not Enough Space (5 Ways)

Updated by Tracy King on Nov 23, 2021
Written by Jean

Workable Solutions Step-by-step Troubleshooting
Fix 1. Delete the Windows.old folder Step 1. Go to the Startup menu search box > Type Cleanup > Click Disk Cleanup...Full steps
Fix 2. Remove junk and useless large files Install EaseUS CleanGenius on your PC, navigate to "Cleanup" and click "Scan"....Full steps
Fix 3. Transfer Free Space to C Drive Step 1. Right-click on the D: partition with enough free space and select "Allocate Space"...Full steps
Fix 4. Resize C Drive Space  Right-click on the System C: drive and select "Resize/Move"...Full steps

Are you excited about the Windows 11 free upgrade from Windows 10? But, unfortunately, you end up getting the following error messages every time you try to update your device on Windows 11. All those errors are related to one issue - Windows 11 update not enough disk space.

  • "Windows needs more space." 
  • "Can't install due to low disk space."
  • "Get more space with external storage."
  • "There is not enough free space on the partition (C:)" and so on.

Do you know why you are getting all these error messages? That's because, for Windows 11 update installation, your device must have 64 GB or higher free space. It is a mandatory requirement mentioned in Windows 11 hardware and system requirements list. 

Since Windows 10 and Windows 11 are programmed to coexist, your device requires sufficient free space to support both operating systems' tools and processes. 

Now, it doesn't mean you have to buy a new computer to experience Windows 11. There you have two simple solutions — free up space on your device or get more space to the C drive from other drives. 

So, let's now check out 5 easy ways to implement both these solutions and become an early Windows 11 user. 

Solution 1. Delete the Windows.old folder

The easiest way to free up space on your device for Windows 11 update is deleting Windows.old folder. This folder is automatically created when you upgrade from one Microsoft OS version to another, starting with Windows Vista. 

Windows.old folder contains all the data from your previous Windows version that you can use to restore your old versions or files. You can find the Windows.old folder in the C: drive of your system storage. However, it is a great feature, but this folder can easily consume 20 GB or more space on your hard disk, depending on your previous Windows installation size. 

Here if your Windows.old folder contains data from your Windows older versions or you no longer require old files, it's better to delete the Windows.old folder and free up space for  Windows 11 update. 

windows.old folder

To delete the Windows.old folder, follow the below steps:

Step 1. Go to the Startup menu search box > Type Cleanup > Click Disk Cleanup.

Step 2. Next, select drive C: and click "OK." You have to wait while your drive gets scanned.and then click Clean up system files. 

windows.old folder

Step 3. Select C: drive again when prompted and press OK. 

Step 4. Now, just select the "Previous Windows installation" checkbox from the files to delete the list and click "OK." 

delete windows.old folder windows 11

However, if you delete the Windows.old folder from File Explorer, it can produce an error message. You can easily avoid this error message by using the PC cleanup tool to scan and remove the Windows.old folder (discussed in solution 2). 

Solution 2. Remove junk and useless large files 

Your computer produces numerous junk files daily to perform different tasks like opening a document or an image. Of course, these files are useless once the task is done. But junk files remain on your device, clogging it up and consuming a large space. 

So, it's pretty safe to delete junk files to free up space on your disk. To do so, you need a PC clean tool because manually finding and removing junk and useless large files is a highly tedious task. 

Using the PC cleaner tool like EaseUS CleanGenius, you can easily detect and delete junk files, useless files, and rarely used files. The tool can also remove browser plugins, free up RAM, startup optimization, and so much more. 

Step 1. DOWNLOAD and install EaseUS CleanGenius on your PC. To begin with, navigate to "Cleanup" and click "Scan".

clean up system step 1

Step 2. EaseUS CleanGenius will start immediately to scan all the useless files, select system junk files and invalid entries and click "Clean" over all your PC.

clean up system step 2

Step 3. Once completes, you can see clearly how many MBs or GBs of data that are cleaned. Click "Done" to finish the process.

clean up system step 3

Moving forward, the next three solutions revolve around the disk and partition space management. So, once again, you require a tool to manage your drivers' space. There you can use another member of the EaseUS family — EaseUS Partition Master. 

Free Download 

Windows 11/10/8/7100% Secure

EaseUS Partition Master is an easy-to-use disk partitioning software used by over 60,000,000 global users. This tool can increase C drive space on your device so you can seamlessly get Windows 11 updates. Additionally, it can resize, format, delete, wipe, or convert disk, migrate OS without reinstalling OS, etc.

So, let's manage your disk space better as the coming three solutions!

Solution 3. Transfer Free Space to C Drive

If you have more free space on your D, E, F, or G drivers on your hard disk, you can easily reallocate their space to C: drive. For this, you simply have to use the "Allocate Space" feature on EaseUS Partition Master. 

Using this feature, you can free up unallocated and allocated space for C drive and install your Windows 11 setup. 

Step 1. Right-click on the D: partition with enough free space and select "Allocate Space".

Select partition to allocate space

Step 2. Select the target partition - C: drive and drag the partition panel rightward to add the free space from D: drive to C: drive. Then click "OK" to confirm.

Allocate space to extend partition

Step 3. Click the "Execute Operation" button and click "Apply" to start the process of moving free space from D: drive to C: drive.

finish extending partition

Solution 4. Resize C Drive Space 

If your system disk has no unallocated space, you can use it in your favor to expand your C drive space. To do so, you have the EaseUS Partition Master "Resize/move" feature at your disposal. 

Free Download 

Windows 11/10/8/7100% Secure

You just have to right-click on a partition excluding the C: drive and click on the "Resize/move" feature. Then, by simply dragging the left panel of the partition to shrink and leaving unallocated space for the C: drive, you can get enough space for Windows 11. 

Option 1. Extend System C drive with unallocated space

  1. 1. Right-click on the System C: drive and select "Resize/Move".
  2. 2. Drag the system partition end into the unallocated space so to add it to the C: drive. And click "OK". 
  3. 3. Click "Execute Operation" and "Apply" to execute the operations and extend the C drive.

Option 2. Extend System C drive without unallocated space

  1. 1. Right-click a big partition with enough free space on the system disk, select "Allocate Space".
  2. 2. Select the system drive at the Allocate Space From (*) To section, and drag the end of System C drive into the unallocated space. Click "OK" to confirm.
  3. 3. Click "Execute Operation", it will list the pending operations, and click "Apply" to save the changes and extend the C drive.

0:00-0:32 Extend System Drive with Unallocated Space; 0:32-1:00 Extend System Drive without Unallocated Space.

Solution 5. Merge C Drive with Any Other Drive 

If you have several partitions on your hard drive and many of your drivers have adequate free space while the C: drive barely has any space left. In this case, you can merge the drives with large free space to the C drive and create a bigger C drive to absorb all Windows 11 updates. 

This drive merger process might look massive right now. But once you install the EaseUS Partition Manager, this process will automatically become simpler. 

Free Download 

Windows 11/10/8/7100% Secure

Step 1. Locate the Target Partition

To start extending partition, you should first locate the target partition and select "Resize/Move".

Select target partition to extend

Step 2. Extend the Target Partition

Drag the partition panel rightward or leftward to add unallocated space into your current partition and click "OK" to confirm.

choose another drive to allocate space

Extra Option: Get Space from Another Drive

If there is not enough unallocated space on your disk, right-click on a big partition with enough free space, select "Allocate space".

Then select the target partition that you want to extend at the allocate space to column.

choose another drive to allocate space

Step 3. Execute Operations to Extend Partition.

Drag the dots of the target partition into the unallocated space and click "OK".

finish extending partition

Then Click the "Execute Operation" button and click "Apply" to keep all the changes. 

Parting Thoughts 

So, here you go, Microsoft users, you are all set to install Windows 11 on your device. It's just a matter of getting the sufficient free space on your hard disk that you can easily get by—

  • Deleting the Windows.old folder 
  • Removing junk files
  • Transferring free space to C drive 
  • Resizing C drive
  • Merging C drive with other drivers 

To perform all these partition solutions, you can install the EaseUS Partition Master today and manage partition resizing, shrinking, merging, transferring like many other features with ease. Once you have tried Windows 11, don't forget to share your experience here.

Free Download 

Windows 11/10/8/7100% Secure

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Updated by Tracy King

Tracy joined in EaseUS in 2013 and has been working with EaseUS content team for over 7 years. Being enthusiastic in computing and technology, she writes tech how-to articles and share technical solutions about Windows & Mac data recovery, file/system backup and recovery, partition management and iOS/Android data recovery.

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Written by Jean

Author Jean has been writing tech articles since she was graduated from university. She has been part of the EaseUS team for over 5 years. Her special focuses are data recovery, disk partitioning, data space optimization, data backup and Mac OS. By the way, she's an aviation fan!

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Product Reviews

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  • I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes. I also think the overall look and feel of EaseUS Partition Master Free makes whatever you're doing with your computer's partitions easy.

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  • Partition Master Free can Resize, Move, Merge, Migrate, and Copy disks or partitions; convert to local, change label, defragment, check and explore partition; and much more. A premium upgrade adds free tech support and the ability to resize dynamic volumes.

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  • It won't hot image your drives or align them, but since it's coupled with a partition manager, it allows you do perform many tasks at once, instead of just cloning drives. You can move partitions around, resize them, defragment, and more, along with the other tools you'd expect from a cloning tool.

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All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.

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