---
title: fRequestedByteCountOfTransfer
framework: scsiperipheralsdriverkit
role: symbol
role_heading: Instance Property
platforms: [driverkit 22.0+]
path: scsiperipheralsdriverkit/scsideviceoutparameters/frequestedbytecountoftransfer
---

# fRequestedByteCountOfTransfer

The size of the data to transfer.

## Declaration

```occ
uint64_t fRequestedByteCountOfTransfer;
```

## See Also

### Setting command parameters

- [fLogicalUnitNumber](scsiperipheralsdriverkit/scsideviceoutparameters/flogicalunitnumber.md)
- [fTimeoutDuration](scsiperipheralsdriverkit/scsideviceoutparameters/ftimeoutduration.md)
- [fCommandDescriptorBlock](scsiperipheralsdriverkit/scsideviceoutparameters/fcommanddescriptorblock.md)
- [fBufferDirection](scsiperipheralsdriverkit/scsideviceoutparameters/fbufferdirection.md)
- [fDataTransferDirection](scsiperipheralsdriverkit/scsideviceoutparameters/fdatatransferdirection.md)
- [fSenseLengthRequested](scsiperipheralsdriverkit/scsideviceoutparameters/fsenselengthrequested.md)
- [fDataBufferAddr](scsiperipheralsdriverkit/scsideviceoutparameters/fdatabufferaddr.md)
- [fSenseBufferAddr](scsiperipheralsdriverkit/scsideviceoutparameters/fsensebufferaddr.md)