Hi, @Ian Long
A Surface Go with limited internal storage can struggle with larger Windows 11 feature updates, even when an external drive is connected.
Microsoft requires at least a 64 GB storage device for Windows 11, but Windows updates can need additional free space temporarily during installation.
Could you check these first?
- Which Surface Go model do you have, Surface Go, Go 2, Go 3, or Go 4?
- Go to "Settings" > "System" > "Storage". What is the total size of the C: drive, and how much free space is showing?
- When the update fails, does Windows tell you exactly how much additional space it needs or show a "Fix issues" option?
If "Fix issues" appears in Windows Update, Microsoft can sometimes use the external drive to help complete the update, although some free space is still required on the internal drive.
Thanks!