---
title: kHFSExtentKeyMaximumLength
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.12+]
path: kernel/1646121-anonymous/khfsextentkeymaximumlength
---

# kHFSExtentKeyMaximumLength

## Declaration

```occ
kHFSExtentKeyMaximumLength = sizeof(HFSExtentKey) - sizeof(u_int8_t)
```