How to fix the error IS-DS01 of Epic games not enough space? This tutorial will list 3 easy methods to help you free up disk space to install any games.
I was trying to install Fornite on my Windows and I was getting this error IS-DS01 of Epic games not enough space that stated I didn't have enough space available to install the game, while I had more than enough free space.
- Question from Reddit
When trying to install a game through the Epic Games Launcher, you might encounter error IS-DS01: Out of disk space, even if your hard drive shows there’s plenty of free space. This issue can be frustrating, especially when you're certain you’ve cleared enough room. However, the error isn’t always caused by actual low disk space—it may result from hidden factors related to installation settings, system behavior, or drive issues. Here’s a table of the most common reasons for the IS-DS01 error:
| Cause | Description |
|---|---|
| Wrong Installation Drive | The launcher may be trying to install the game to a nearly full drive instead of the one you intended. |
| Not Enough Temporary Space | Even if the target drive has space, the system (especially C: drive) needs extra temporary space to unpack files. |
| File System Errors or Permissions | Corrupted file systems or lack of admin rights can block the installation or confuse available space. |
| Launcher Cache Problems | Cached data might misreport available storage. Clearing the cache may fix this misreading. |
| Extra Space Needed for Setup | Installation usually requires more space than the final game size—up to 20% more for unpacking and setup files. |
These hidden causes are why the system sometimes claims there’s not enough space—even when your drive appears to have enough. Misconfigured settings, limited permissions, or temporary file needs can all trigger the error. Now that we’ve covered the potential reasons behind the IS-DS01 error, let’s look at some practical solutions you can try to fix the “not enough space” error in Epic Games Launcher.
How much disk space do you need for Epic games? The Epic Games Launcher needs about 1 GB of space, while game sizes vary. Fortnite requires around 30–40 GB, and larger titles may need over 100 GB. For multiple games, 100–150 GB of free space is recommended. To avoid the Epic Games installation failed error, it's best to ensure enough free space. Here are some methods that can help you free up or manage disk space effectively.
Windows has a program to clean the target drive called “Disk Cleanup”, it can scan useless files and outdated Windows files and allow users to clean them.
Step 1. Open File Explorer and right-click on C: drive and select “Properties”, and then click the "Disk Cleanup" button in the disk properties window.
Step 2. Select the files you want to delete and click “OK”. From there, you can delete previous Windows installation (Windows.old folder), system restore points, Recycle Bin, and other system files.
To fix error IS-DS01 of Epic games not enough space, if you're not set on keeping programs on the C drive, you can reinstall them to another drive that has enough space.
Step 1. Use the search bar to find Control Panel in Windows.
Step 2. Click on “Uninstall” a program under the “Programs” > “Programs and Features”.
Step 3. Right-click on the program you wish to reinstall and uninstall it.
Or open “Settings” > “Apps & features” to uninstall the programs.
After you uninstall the programs, you can go to the official website to download them and change the storage location when the pop window shows.
One effective way to fix the Epic Games IS-DS01 “not enough space” error is to add more free space to the drive where Epic Games is installed. If the installation drive (often C: or D:) doesn’t have enough available space, the launcher won’t be able to complete the installation, even if other drives have plenty of room.
To fix this, you can allocate free space from another drive (like D:) to the Epic Games drive (like C:). There are two main ways to do this: using Windows’ built-in Disk Management (DM) or a third-party partition tool like AOMEI Partition Assistant. For beginners, it’s recommended to use AOMEI Partition Assistant because of its easy-to-use interface and high success rate, even with no technical experience.
The Best Windows Disk Partition Manager and PC Optimizer
Step 1. Right click partition D and select Allocate Free Space.
Step 2. Set how much space you want to allocate form partition D and choose C partition as a target partition.
Step 3. Preview the result after allocation. If that’s what you want, just click "Apply" on upper left to carry out the operation.
Notes:
1. If it looks not like what you want, or you want C drive to be larger, you can click Discard behind Apply and do the operations above once more.
2. You can also complete the “increase c drive space from d drive” task using Extend Partition feature of this software.
The IS-DS01 error in the Epic Games Launcher can be misleading, especially when your system shows there’s enough free space. However, hidden issues like limited temporary storage, incorrect installation paths, or partition problems can cause this error. By cleaning up your disk, reinstalling applications to another drive, or reallocating free space to the Epic Games drive, you can effectively fix the issue and complete your game installation without further problems.