# X_STORAGE_KEY_CONFLICT

## Means

the key collides with another key on a local or memory disk

## Typical cause

the local driver stores an object as a file at its key, so one key cannot be both an object and the directory of another: `put('a')` then `put('a/b')`, or the reverse — or `a` beside `a.json/b`, which collide in the sidecar tree. Refused before a byte moves; it was a bare `ENOTDIR` / `EISDIR`. `s3Driver` and `memoryStorageDriver` hold both

## Fix

`disk("<disk>").list({ prefix: "a" })` with the name the disk is registered under — lists the object in the way (the cause names it); store one of the two under a different key

[Storage](/error-codes#storage)