---
title: MAXIMUM_UNMAP_BLOCK_DESCRIPTOR_COUNT
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 13.0+, macOS 10.12+]
path: iokit/scsicmd_inquiry_pageb0_data/1792079-maximum_unmap_block_descriptor_c
---

# MAXIMUM_UNMAP_BLOCK_DESCRIPTOR_COUNT

## Declaration

```occ
UInt32 MAXIMUM_UNMAP_BLOCK_DESCRIPTOR_COUNT;
```