# DADiskMountApprovalCallback Type of the callback function used by DARegisterDiskMountApprovalCallback(). ``` typealias DADiskMountApprovalCallback = (DADisk, UnsafeMutableRawPointer?) -> Unmanaged? ``` ## Parameters `disk` A disk object. `context` The user-defined context parameter given to the registration function. ## Return Value A dissenter reference. Pass NULL to approve. ## Discussion The caller of this callback receives a reference to the returned object. The caller also implicitly retains the object and is responsible for releasing it with CFRelease(). --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)