---
title: kIOMaximumSegmentByteCountWriteKey
framework: IOKit
role: symbol
role_heading: Global Variable
platforms: [iOS 16.0+, iPadOS 16.0+, Mac Catalyst 13.0+, macOS 10.2+, visionOS 1.0+]
path: iokit/kiomaximumsegmentbytecountwritekey
---

# kIOMaximumSegmentByteCountWriteKey

## Declaration

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