Okay I managed to finally succeed in getting the Adaptec Embedded Serial ATA HostRAID Driver For Windows 2000/XP/2003 driver to work in the [MassStorageDrivers] section of the unattended file. This is the aarich.sys driver that had given me fits last month. First off, let's get the directory structures straight. You need to copy the .cat, .inf, and .sys, hraidsk1, txtsetup.oem and whatever driver files available into the following two directories: $OEM$\textmode i386\$OEM$ To be safe, I also stuck the driver files in the $OEM$\$\Drivers\... structure and added the path to the OemPnPDriversPath variable in the [unattended] section of the unattend file. The txtsetup.oem file needs to be edited so that it has this line: [Disks] d1 = "Adaptec Embedded Serial ATA HostRAID Driver Ver 2.01 for Windows 2000/XP/2003", hraidsk1, "" The following sections were added to the unattend file: [MassStorageDrivers] "Adaptec Embedded Serial ATA HostRAID Driver For Windows 2000/XP/2003" = OEM "IDE CD-ROM (ATAPI 1.2)/PCI IDE Controller" = "RETAIL" [OEMBootFiles] aarich.inf aarich.sys aarich.cat hraidsk1 aichmgt.cat aichmgt.inf txtsetup.oem Setup now works for SATA drives setup as SATA or RAID. This was tested on the ASUS PSCH-SR/SATA server motherboard with the Intel E7210 / 6300ESB chipsets. The 6300ESB is a modified south bridge that incorporates an Adaptec embedded SATA/RAID controller (codename: Hance Rapids). The Intel E7210 north bridge was known by the codename Canterwood-ES.