---
title: kIOMaximumSegmentAddressableBitCountKey
framework: IOKit
role: symbol
role_heading: Global Variable
platforms: [iOS 16.0+, iPadOS 16.0+, Mac Catalyst 13.0+, macOS 10.4+, visionOS 1.0+]
path: iokit/kiomaximumsegmentaddressablebitcountkey
---

# kIOMaximumSegmentAddressableBitCountKey

## Declaration

```swift
var kIOMaximumSegmentAddressableBitCountKey: String { get }
```