---
title: kIOMaximumSegmentCountWriteKey
framework: IOKit
role: symbol
role_heading: Global Variable
platforms: [iOS 16.0+, iPadOS 16.0+, Mac Catalyst 13.0+, macOS 10.1+, visionOS 1.0+]
path: iokit/kiomaximumsegmentcountwritekey
---

# kIOMaximumSegmentCountWriteKey

## Declaration

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