# FILE_ALLOCATE_UNSHARE_RANGE

`import { FILE_ALLOCATE_UNSHARE_RANGE } from "destack:fs/binding";`

Break shared extents before future writes.

```ds title="FILE_ALLOCATE_UNSHARE_RANGE"
const FILE_ALLOCATE_UNSHARE_RANGE: FileAllocateFlags
```

[language/library/src/fs/binding/file.ds:165](https://github.com/destack-sh/destack/blob/main/language/library/src/fs/binding/file.ds#L165)