initWithBestSelection

Handy initializer: pass the 512-byte result of the Identify Device or Identify Packet Device in endian-order for your platform (byte-swapped on PPC) and the IOATABusInfo object for the bus. The object will initialize all fields and select the best transfer modes that match on bus and device. If the return value was 0 (success or noErr), then a matching mode is supported. Examine the PIO and UDMA/DMA fields and to generate the apropriate SET FEATURES parameters for your drive and send this initialised object to the IOATAController when requesting a speed configuration. failure means no supported transfer modes matched between bus and device info.

IOReturn initWithBestSelection(
 const UInt16 *identifyData,
 IOATABusInfo *busInfo);