The SCSI Storport driver is optional for Windows 7, Vista and Windows 2008. User can use Windows in-box AHCI driver for copmplete HyperDuo and RAID function.

If inbox AHCI driver is used, the 91xx controller will be considered as SATA AHCI class controller

If Marvell SCSI Storport driver is used, the 91xx controller will be considered as SCSI class Mass Storage / RAID  controller


Windows 7 might have different policy on handling SSD / TRIM support when device connected to AHCI or Mass Storage controller.