---
title: kIOUserStorageOptionForceUnitAccess
framework: BlockStorageDeviceDriverKit
role: symbol
role_heading: Macro
platforms: [driverkit 21.0+]
path: blockstoragedevicedriverkit/kiouserstorageoptionforceunitaccess
---

# kIOUserStorageOptionForceUnitAccess

An option to use Force Unit Access (FUA).

## Declaration

```occ
#define kIOUserStorageOptionForceUnitAccess
```

## Discussion

Discussion This option tells the storage stack to force a request to access the media.

## See Also

### Storage Options

- [kIOUserStorageOptionNone](blockstoragedevicedriverkit/kiouserstorageoptionnone.md)