# Volume Property Keys Keys that apply to volumes. ## Topics ### Constants [`let kCFURLVolumeNameKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeNameKey) The name of the volume, returned as a `CFString` object. [`let kCFURLVolumeLocalizedNameKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeLocalizedNameKey) The user-presentable name of the volume, returned as a `CFString` object. [`let kCFURLVolumeLocalizedFormatDescriptionKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeLocalizedFormatDescriptionKey) Key for the volume’s descriptive format name, returned as a `CFString` object. [`let kCFURLVolumeTotalCapacityKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeTotalCapacityKey) Key for the volume’s capacity in bytes, returned as a `CFNumber` object. [`let kCFURLVolumeAvailableCapacityKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeAvailableCapacityKey) Key for the volume’s available capacity in bytes, returned as a `CFNumber` object. [`let kCFURLVolumeResourceCountKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeResourceCountKey) Key for the total number of resources on the volume, returned as a `CFNumber` object. [`let kCFURLVolumeSupportsPersistentIDsKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsPersistentIDsKey) Key for determining whether the volume supports persistent IDs, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsSymbolicLinksKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsSymbolicLinksKey) Key for determining whether the volume supports symbolic links, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsHardLinksKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsHardLinksKey) Key for determining whether the volume supports hard links, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsJournalingKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsJournalingKey) Key for determining whether the volume supports journaling, returned as a `CFBoolean` object. [`let kCFURLVolumeIsJournalingKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeIsJournalingKey) Key for determining whether the volume is currently journaling, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsSparseFilesKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsSparseFilesKey) Key for determining whether the volume supports sparse files, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsZeroRunsKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsZeroRunsKey) Key for determining whether the volume supports zero runs, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsCaseSensitiveNamesKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsCaseSensitiveNamesKey) Key for determining whether the volume supports case-sensitive names, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsCasePreservedNamesKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsCasePreservedNamesKey) Key for determining whether the volume supports case-preserved names, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsRootDirectoryDatesKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsRootDirectoryDatesKey) Key for determining whether the volume supports reliable storage of times for the root directory, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsVolumeSizesKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsVolumeSizesKey) Key for determining whether the volume supports returning volume size information, returned as a `CFBoolean` object. If `true`, volume size information is available as values of the [`kCFURLVolumeTotalCapacityKey`](/documentation/CoreFoundation/kCFURLVolumeTotalCapacityKey) and [`kCFURLVolumeAvailableCapacityKey`](/documentation/CoreFoundation/kCFURLVolumeAvailableCapacityKey) keys. [`let kCFURLVolumeSupportsRenamingKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsRenamingKey) Key for determining whether the volume can be renamed, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsAdvisoryFileLockingKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsAdvisoryFileLockingKey) Key for determining whether the volume implements whole-file advisory locks in the style of flock, along with the `O_EXLOCK` and `O_SHLOCK` flags of the open function, returned as a `CFBoolean` object. [`let kCFURLVolumeSupportsExtendedSecurityKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeSupportsExtendedSecurityKey) Key for determining whether the volume supports extended security (access control lists), returned as a `CFBoolean` object. [`let kCFURLVolumeIsBrowsableKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeIsBrowsableKey) Key for determining whether the volume is visible in GUI-based file-browsing environments, such as the Desktop or the Finder application, returned as a `CFBoolean` object. [`let kCFURLVolumeMaximumFileSizeKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeMaximumFileSizeKey) Key for the largest file size supported by the volume in bytes, returned as a `CFNumber` object, or `NULL` if it cannot be determined. [`let kCFURLVolumeIsEjectableKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeIsEjectableKey) Key for determining whether the volume is ejectable from the drive mechanism under software control, returned as a `CFBoolean` object. [`let kCFURLVolumeIsRemovableKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeIsRemovableKey) Key for determining whether the volume is removable from the drive mechanism, returned as a `CFBoolean` object. [`let kCFURLVolumeIsInternalKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeIsInternalKey) Key for determining whether the volume is connected to an internal bus, returned as a `CFBoolean` object, or `NULL` if it cannot be determined. [`let kCFURLVolumeIsAutomountedKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeIsAutomountedKey) Key for determining whether the volume is automounted, returned as a `CFBoolean` object. [`let kCFURLVolumeIsLocalKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeIsLocalKey) Key for determining whether the volume is stored on a local device, returned as a `CFBoolean` object. [`let kCFURLVolumeIsReadOnlyKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeIsReadOnlyKey) Key for determining whether the volume is read-only, returned as a `CFBoolean` object. [`let kCFURLVolumeCreationDateKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeCreationDateKey) Key for the volume’s creation date, returned as a `CFDate` object, or `NULL` if it cannot be determined. [`let kCFURLVolumeURLForRemountingKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeURLForRemountingKey) Key for the URL needed to remount the network volume, returned as a `CFURL` object, or `NULL` if a URL is not available. [`let kCFURLVolumeUUIDStringKey: CFString!`](/documentation/CoreFoundation/kCFURLVolumeUUIDStringKey) Key for the volume’s persistent UUID, returned as a `CFString` object, or `NULL` if a persistent UUID is not available. --- 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)