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ATA Port I/O Model

Last Updated: 3/8/2017

NOTE The ATA port driver and ATA miniport driver models may be altered or unavailable in the future. Instead, we recommend using the Storport driver and Storport miniport driver models.

The ATA port driver, just as the Storport driver, uses a push model of I/O. This means that the driver forwards I/O requests asynchronously to its miniport driver, up to a maximum number of overlapping packets, without waiting for the miniport driver to request input. In the push model, the port driver controls the flow of the I/O requests and pushes requests down to the miniport driver.

On the other hand, the SCSI port driver uses a pull model of I/O. In a pull model of I/O, the SCSI port driver forwards I/O requests to its miniport driver synchronously and waits for the miniport driver to request new input before it sends the next I/O request. Additionally, the miniport driver controls the flow of I/O requests and pulls the requests down from the port driver.

For more information about the I/O model of the Storport driver, see Storport I/O Model.

For more information about the I/O model of the SCSI port driver, see SCSI Port I/O Model.


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