# DiskArbitration.h Register for mount/unmount notifications, and block mount/unmount events. ## Overview See the Overview section above for header-level documentation. ## Overview ### Included Headers - - - - ## Topics ### Miscellaneous [`DADiskClaim(_:_:_:_:_:_:)`](/documentation/DiskArbitration/DADiskClaim(_:_:_:_:_:_:)) Claims the specified disk object for exclusive use. [`DADiskEject(_:_:_:_:)`](/documentation/DiskArbitration/DADiskEject(_:_:_:_:)) Ejects the specified disk object. [`DADiskGetOptions(_:)`](/documentation/DiskArbitration/DADiskGetOptions(_:)) Obtains the options for the specified disk. [`DADiskIsClaimed(_:)`](/documentation/DiskArbitration/DADiskIsClaimed(_:)) Reports whether or not the disk is claimed. [`DADiskMount(_:_:_:_:_:)`](/documentation/DiskArbitration/DADiskMount(_:_:_:_:_:)) Mounts the volume at the specified disk object. [`DADiskMountWithArguments(_:_:_:_:_:_:)`](/documentation/DiskArbitration/DADiskMountWithArguments(_:_:_:_:_:_:)) Mounts the volume at the specified disk object, with the specified mount options. [`DADiskRename(_:_:_:_:_:)`](/documentation/DiskArbitration/DADiskRename(_:_:_:_:_:)) Renames the volume at the specified disk object. [`DADiskSetOptions(_:_:_:)`](/documentation/DiskArbitration/DADiskSetOptions(_:_:_:)) Sets the options for the specified disk. [`DADiskUnclaim(_:)`](/documentation/DiskArbitration/DADiskUnclaim(_:)) Unclaims the specified disk object. [`DADiskUnmount(_:_:_:_:)`](/documentation/DiskArbitration/DADiskUnmount(_:_:_:_:)) Unmounts the volume at the specified disk object. [`DARegisterDiskAppearedCallback(_:_:_:_:)`](/documentation/DiskArbitration/DARegisterDiskAppearedCallback(_:_:_:_:)) Registers a callback function to be called whenever a disk has appeared. [`DARegisterDiskDescriptionChangedCallback(_:_:_:_:_:)`](/documentation/DiskArbitration/DARegisterDiskDescriptionChangedCallback(_:_:_:_:_:)) Registers a callback function to be called whenever a disk description has changed. [`DARegisterDiskDisappearedCallback(_:_:_:_:)`](/documentation/DiskArbitration/DARegisterDiskDisappearedCallback(_:_:_:_:)) Registers a callback function to be called whenever a disk has disappeared. [`DARegisterDiskEjectApprovalCallback(_:_:_:_:)`](/documentation/DiskArbitration/DARegisterDiskEjectApprovalCallback(_:_:_:_:)) Registers a callback function to be called whenever a volume is to be ejected. [`DARegisterDiskMountApprovalCallback(_:_:_:_:)`](/documentation/DiskArbitration/DARegisterDiskMountApprovalCallback(_:_:_:_:)) Registers a callback function to be called whenever a volume is to be mounted. [`DARegisterDiskPeekCallback(_:_:_:_:_:)`](/documentation/DiskArbitration/DARegisterDiskPeekCallback(_:_:_:_:_:)) Registers a callback function to be called whenever a disk has been probed. [`DARegisterDiskUnmountApprovalCallback(_:_:_:_:)`](/documentation/DiskArbitration/DARegisterDiskUnmountApprovalCallback(_:_:_:_:)) Registers a callback function to be called whenever a volume is to be unmounted. [`DAUnregisterApprovalCallback`](/documentation/DiskArbitration/DAUnregisterApprovalCallback) Unregisters a registered callback function. [`DAUnregisterCallback(_:_:_:)`](/documentation/DiskArbitration/DAUnregisterCallback(_:_:_:)) Unregisters a registered callback function. ### Callbacks See the Overview section above for header-level documentation. [`DADiskAppearedCallback`](/documentation/DiskArbitration/DADiskAppearedCallback) Type of the callback function used by DARegisterDiskAppearedCallback(). [`DADiskClaimCallback`](/documentation/DiskArbitration/DADiskClaimCallback) Type of the callback function used by DADiskClaim(). [`DADiskClaimReleaseCallback`](/documentation/DiskArbitration/DADiskClaimReleaseCallback) Type of the callback function used by DADiskClaim(). [`DADiskDescriptionChangedCallback`](/documentation/DiskArbitration/DADiskDescriptionChangedCallback) Type of the callback function used by DARegisterDiskDescriptionChangedCallback(). [`DADiskDisappearedCallback`](/documentation/DiskArbitration/DADiskDisappearedCallback) Type of the callback function used by DARegisterDiskDisappearedCallback(). [`DADiskEjectApprovalCallback`](/documentation/DiskArbitration/DADiskEjectApprovalCallback) Type of the callback function used by DARegisterDiskEjectApprovalCallback(). [`DADiskEjectCallback`](/documentation/DiskArbitration/DADiskEjectCallback) Type of the callback function used by DADiskEject(). [`DADiskMountApprovalCallback`](/documentation/DiskArbitration/DADiskMountApprovalCallback) Type of the callback function used by DARegisterDiskMountApprovalCallback(). [`DADiskMountCallback`](/documentation/DiskArbitration/DADiskMountCallback) Type of the callback function used by DADiskMount(). [`DADiskPeekCallback`](/documentation/DiskArbitration/DADiskPeekCallback) Type of the callback function used by DARegisterDiskPeekCallback(). [`DADiskRenameCallback`](/documentation/DiskArbitration/DADiskRenameCallback) Type of the callback function used by DADiskRename(). [`DADiskUnmountApprovalCallback`](/documentation/DiskArbitration/DADiskUnmountApprovalCallback) Type of the callback function used by DARegisterDiskUnmountApprovalCallback(). [`DADiskUnmountCallback`](/documentation/DiskArbitration/DADiskUnmountCallback) Type of the callback function used by DADiskUnmount(). ### Constants [Global Variables](/documentation/DiskArbitration/global-variables) [`DADiskClaimOptions`](/documentation/DiskArbitration/DADiskClaimOptions) Options for DADiskClaim(). [`DADiskEjectOptions`](/documentation/DiskArbitration/DADiskEjectOptions) Options for DADiskEject(). [`DADiskMountOptions`](/documentation/DiskArbitration/DADiskMountOptions) Options for DADiskMount(). [`DADiskOptions`](/documentation/DiskArbitration/DADiskOptions) Options for DADiskGetOptions() and DADiskSetOptions(). [`DADiskRenameOptions`](/documentation/DiskArbitration/DADiskRenameOptions) Options for DADiskRename(). [`DADiskUnmountOptions`](/documentation/DiskArbitration/DADiskUnmountOptions) Options for DADiskUnmount(). --- Copyright © 2026 Apple Inc. 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