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# FSVolume.PreallocateFlags

Behavior flags for preallocation operations.

```
struct PreallocateFlags
```

## Topics

### Declaring preallocation behaviors

[`contiguous`](/documentation/FSKit/FSVolume/PreallocateFlags/contiguous)

Allocates contiguous space.

[`all`](/documentation/FSKit/FSVolume/PreallocateFlags/all)

Allocates all requested space or no space at all.

[`persist`](/documentation/FSKit/FSVolume/PreallocateFlags/persist)

Allocates space that isn’t freed when deleting the descriptor.

[`fromEOF`](/documentation/FSKit/FSVolume/PreallocateFlags/fromEOF)

Allocates space from the physical end of file.

### Working with raw values

[`init(rawValue:)`](/documentation/FSKit/FSVolume/PreallocateFlags/init(rawValue:))


---

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