---
title: OPTIMAL_TRANSFER_LENGTH
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [driverkit 22.0+, Mac Catalyst 13.0+, macOS 10.12+]
path: iokit/scsicmd_inquiry_pageb0_data/1792055-optimal_transfer_length
---

# OPTIMAL_TRANSFER_LENGTH

## Declaration

```occ
UInt32 OPTIMAL_TRANSFER_LENGTH;
```