# XPC_ACTIVITY_REQUIRE_HDD_SPINNING A Boolean value indicating whether the activity should only be performed while the hard disk drive (HDD) is spinning. ``` let XPC_ACTIVITY_REQUIRE_HDD_SPINNING: UnsafePointer ``` ## Discussion Computers with flash storage are considered to be equivalent to HDD spinning. Defaults to `NO`. --- 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)