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# fDataBufferAddr

The virtual address of the buffer the dext creates to transfer data.

```
uint64_t fDataBufferAddr;
```

## Discussion

The framework uses this address to create an <doc://com.apple.documentation/documentation/DriverKit/IOMemoryDescriptor> in the kernel that [`fRequestedByteCountOfTransfer`](/documentation/SCSIPeripheralsDriverKit/SCSIDeviceOutParameters/fRequestedByteCountOfTransfer) specifies and maps to the dext process.

---

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