---
title: firstRZoneNumberInLastBorderMSB
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 13.0+, macOS 10.2+]
path: iokit/dvddiscinfo/1393967-firstrzonenumberinlastbordermsb
---

# firstRZoneNumberInLastBorderMSB

## Declaration

```occ
UInt8 firstRZoneNumberInLastBorderMSB;
```