---
title: DASDModeParameterBlockDescriptor
framework: IOKit
role: symbol
role_heading: Structure
platforms: [Mac Catalyst 13.0+, macOS 10.3+]
path: iokit/dasdmodeparameterblockdescriptor
---

# DASDModeParameterBlockDescriptor

## Declaration

```occ
typedef struct DASDModeParameterBlockDescriptor {
    ...
} DASDModeParameterBlockDescriptor;
```

## Overview

Overview Direct Access Storage Device mode parameter block descriptor.

## Topics

### Instance Properties

- [BLOCK_LENGTH](iokit/dasdmodeparameterblockdescriptor/1555510-block_length.md)
- [DENSITY_CODE](iokit/dasdmodeparameterblockdescriptor/1555446-density_code.md)
- [NUMBER_OF_BLOCKS](iokit/dasdmodeparameterblockdescriptor/1555468-number_of_blocks.md)