# X_STORAGE_UNWRITABLE

## Means

the storage disk this process needs cannot be written to

## Typical cause

a hardened container (`readOnlyRootFilesystem: true`) with no writable volume at the embedded disk's root, or `S3_ENDPOINT` set with `S3_BUCKET` empty

## Fix

mount a writable volume at the path in the message, or set `S3_ENDPOINT` + `S3_BUCKET` to use object storage. `x doctor --json` shows which binding this process resolved

[Routes, render and budgets](/error-codes#routes-render-and-budgets)