# I can't launch UEFN after changing an external SSD drive.

**URL:** <https://forums.unrealengine.com/t/i-cant-launch-uefn-after-changing-an-external-ssd-drive/2103258>\
**Category:** Issues and Bug Reporting\
**Tags:** fortnite-creative, unreal-editor-for-fortnite, question, fortnite\
**Created:** [November 3, 2024, 10:59pm UTC](https://forums.unrealengine.com/t/i-cant-launch-uefn-after-changing-an-external-ssd-drive/2103258 "2024-11-03T22:59:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![masa\_jpn007](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/masa_jpn007/32/637914_2.png) [@masa\_jpn007](https://forums.unrealengine.com/u/masa_jpn007)\
**Post date:** [November 3, 2024, 10:59pm UTC](https://forums.unrealengine.com/t/i-cant-launch-uefn-after-changing-an-external-ssd-drive/2103258/1 "2024-11-03T22:59:49Z")

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### Summary

I can’t launch UEFN after changing an external SSD drive.  
Every time I launch UEFN, I received the following Error.

I uninstall UEFN and reinstall it, but it didn’t work.  
What should I do in this case?

### Please select what you are reporting on:

Unreal Editor for Fortnite

### What Type of Bug are you experiencing?

Other

### Steps to Reproduce

I can’t launch UEFN after changing an external SSD drive.  
Every time I launch UEFN, I received the following Error.

I uninstall UEFN and reinstall it, but it didn’t work.  
What should I do in this case?

### Expected Result

After reinstalling UEFN, I thought this issue will be solved.

### Observed Result

I still can’t launch UEFN.

### Platform(s)

PC

 ![UEFNError](https://d3kjluh73b9h9o.cloudfront.net/original/4X/9/5/2/95210ec9a910a4a9f2902c2a318ebf93cb408c04.png)

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<div class="post-metadata">

**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [November 4, 2024, 5:04am UTC](https://forums.unrealengine.com/t/i-cant-launch-uefn-after-changing-an-external-ssd-drive/2103258/2 "2024-11-04T05:04:38Z")

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hi @masa_jpn007  
we had that before in this post  
[[Solved] How to fix Fatal Errors in UEFN related to Graphic Cards and Shaders and Derived Data problems - General / Issues and Bug Reporting - Epic Developer Community Forums](https://forums.unrealengine.com/t/solved-how-to-fix-fatal-errors-in-uefn-related-to-graphic-cards-and-shaders-and-derived-data-problems/2080832/9)

summary  
you need to add directory on example F:  
F:\Program Files\Epic Games  
Then you can install UEFN  
Program Files\Epic Games\ ON drive needs to be made

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<div class="post-metadata">

**Author:** ![masa\_jpn007](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/masa_jpn007/32/637914_2.png) [@masa\_jpn007](https://forums.unrealengine.com/u/masa_jpn007)\
**Post date:** [November 4, 2024, 11:49am UTC](https://forums.unrealengine.com/t/i-cant-launch-uefn-after-changing-an-external-ssd-drive/2103258/3 "2024-11-04T11:49:55Z")

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Thank you for your help. I installed it via Epic Game Launcher. So, files have been saved to  
F:\EpicGamesLibrary\Fortnite automatically. I can’t change the location to be saved. I created folders Program Files\Epic Games on F, but it didn’t work. Maybe I misunderstand something?

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<div class="post-metadata">

**Author:** ![Jimbohalo10](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/jimbohalo10/32/961440_2.png) [@Jimbohalo10](https://forums.unrealengine.com/u/Jimbohalo10)\
**Post date:** [November 4, 2024, 3:40pm UTC](https://forums.unrealengine.com/t/i-cant-launch-uefn-after-changing-an-external-ssd-drive/2103258/4 "2024-11-04T15:40:48Z")

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Hi @masa_jpn007 ,  
There are two ways to fix this  
In Windows File Manager copy all the files from F:\EpicGamesLibrary\Fortnite to  
F:\Program Files\Epic Games\Fortnite.

If this does not work  
Get into the Epic Launcher find the file Unreal Engine Fortnite Right-click the three dots and click uninstall.

Come out of the Epic Launcher and Open Launcher by right-clicking “Run as Administrator”

Find the file Unreal Engine Fortnite and click install.  
This the offers you a chance to install at F:\Program Files\Epic Games\Fortnite.  
Change the C: for F:

 ![UEFN-Fortnite-32_00_install](https://d3kjluh73b9h9o.cloudfront.net/original/4X/a/e/0/ae079db275149354b69051d780c3c1b87ea64174.png)