---
title: READ_CAPACITY
framework: kernel
role: symbol
role_heading: Instance Method
path: kernel/ioscsimultimediacommandsdevice/1576194-read_capacity
---

# READ_CAPACITY

## Declaration

```occ
virtual bool READ_CAPACITY(SCSITaskIdentifier request, IOMemoryDescriptor *dataBuffer, SCSICmdField1Bit RELADR, SCSICmdField4Byte LOGICAL_BLOCK_ADDRESS, SCSICmdField1Bit PMI, SCSICmdField1Byte CONTROL);
```