---
title: kIOReturnIsoTooOld
framework: IOKit
role: symbol
role_heading: Global Variable
platforms: [Mac Catalyst 13.0+, macOS 10.9+, xcode 8.0+]
path: iokit/kioreturnisotooold
---

# kIOReturnIsoTooOld

## Declaration

```swift
var kIOReturnIsoTooOld: IOReturn { get }
```