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# SCSIParallelFeature

A feature that the driver extension supports.

```
typedef enum SCSIParallelFeature : unsigned int { ... } SCSIParallelFeature;
```

## Overview

This enumeration defines feature selectors the framework uses to identify features of the SCSI parallel interface. The [`UserDoesHBASupportSCSIParallelFeature`](/documentation/SCSIControllerDriverKit/IOUserSCSIParallelInterfaceController/UserDoesHBASupportSCSIParallelFeature) function uses these to report whether the HBA supports a SCSI parallel interface feature. The framework also uses these to request negotiation and report negotiation results between the controller and the device.

## Topics

### Feature selectors

[`kSCSIParallelFeature_WideDataTransfer`](/documentation/SCSIControllerDriverKit/SCSIParallelFeature/kSCSIParallelFeature_WideDataTransfer)

The selector for support of wide data transfers.

[`kSCSIParallelFeature_SynchronousDataTransfer`](/documentation/SCSIControllerDriverKit/SCSIParallelFeature/kSCSIParallelFeature_SynchronousDataTransfer)

The selector for support of synchronous data transfers.

[`kSCSIParallelFeature_QuickArbitrationAndSelection`](/documentation/SCSIControllerDriverKit/SCSIParallelFeature/kSCSIParallelFeature_QuickArbitrationAndSelection)

The selector for support of quick arbitration and selection (QAS).

[`kSCSIParallelFeature_DoubleTransitionDataTransfers`](/documentation/SCSIControllerDriverKit/SCSIParallelFeature/kSCSIParallelFeature_DoubleTransitionDataTransfers)

The selector for support of double transition (DT) data transfers.

[`kSCSIParallelFeature_InformationUnitTransfers`](/documentation/SCSIControllerDriverKit/SCSIParallelFeature/kSCSIParallelFeature_InformationUnitTransfers)

The selector for SPI information unit (IU) transfers.

[`kSCSIParallelFeature_TotalFeatureCount`](/documentation/SCSIControllerDriverKit/SCSIParallelFeature/kSCSIParallelFeature_TotalFeatureCount)

The total number of supported features.


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