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# BlockStorageDeviceDriverKit

Develop drivers for custom storage devices that communicate with the driver using custom protocols.

## Overview

Use `BlockStorageDeviceDriverKit` in conjunction with frameworks like <doc://com.apple.documentation/documentation/PCIDriverKit> to create drivers that can communicate with their hardware using custom storage interconnect protocols.

Develop your driver by subclassing [`IOUserBlockStorageDevice`](/documentation/BlockStorageDeviceDriverKit/IOUserBlockStorageDevice) and overriding all methods the framework declares as C++ pure virtual. Then package your driver in an app that uses the <doc://com.apple.documentation/documentation/SystemExtensions> framework to install and upgrade the driver on the user’s Mac.

> Note:
> BlockStorageDeviceDriverKit is available on macOS.

## Topics

### Essentials

  <doc://com.apple.documentation/documentation/BundleResources/Entitlements/com.apple.developer.driverkit.family.block-storage-device>

### Driver Interfaces

[`IOUserBlockStorageDevice`](/documentation/BlockStorageDeviceDriverKit/IOUserBlockStorageDevice)

A DriverKit provider object that manages communications with a block storage device.


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