Start here
- Check free space using the OS storage tools.
- Back up your saves and identify large files you recognize.
- Remove only content you intentionally no longer need.
- If expansion failed, follow instructions for the exact image and keep the original card recoverable.
What usually causes this?
The writable partition is full or an image has not expanded as expected.
Advanced explanation
Compressed download size is smaller than the written image. Leave additional room for saves, updates and your own game files.
Still stuck?
Record what changed after each check. Include your exact board, image, emulator and error when asking for help. These are diagnostic starting points, not guaranteed fixes for every OS.
FAQ: detailed upstream reference →
Reference: RetroPie FAQ documentation. Original companion checklist; historical upstream guidance needs OS-specific review.