This is mentioned on the driverpacks forums. To quote from that link: This is specific to the AMCC 3ware 7000/8000 series sata controller drivers. Later in that same thread, its stated that these drivers were removed from the driverpacks project (the initial post is in reference to a much older version of DriverPacks). However, for my disk I just ended up using a workaround with a multiboot, with a different winnt.sif for if I am installing on a system using that card, or a different one I can use if I just want to use the native driverpacks drivers (which use method 1 for driver slipstreaming). The guide outlined in the first post of this thread is what i think is known as method2, using $OEM$\TEXTMODE and defining an [OemBootFiles] section in winnt.sif/unattend.txt I also found that with all of the driverpacks mass storage drivers enabled, it takes a long time for the installer to start as it loads every mass storage driver into memory every time you run the installer. For this reason, I may end up making a few other multiboot options to load different sets of drivers to allow the installer to run a little more smoothly at the start. Since method1 drivers add lines for them into txtsetup.sif, you should be able to directly reference them in winnt.sif as such: ;this is example code from txtsetup.sif, of lines which were added by driverpacks [SCSI] aic78xx = "Adaptec AHA-294X/AHA-394X/AIC-78XX SCSI Controller" aic78u2 = "Adaptec AHA-294XU2/AIC-7890 SCSI Controller" arc = "Adaptec RAID Storport Driver" afcnt = "Agilent HHBA-510x PCI Fibre Channel Controller" cpqarray = "Compaq Drive Array" taking these lines, we should be able to create a winnt.sif that only looks for those specific drivers by placing them in [MassStorageDevices] as such: ;this is example code from winnt.sif, referencing the lines above from txtsetup.sif [MassStorageDrivers] "IDE CD-ROM (ATAPI 1.2)/PCI IDE Controller" = "RETAIL";if you are going to define any set of method1 drivers in winnt.sif, you need at least this one. "Adaptec AHA-294X/AHA-394X/AIC-78XX SCSI Controller" = "RETAIL" "Adaptec AHA-294XU2/AIC-7890 SCSI Controller" = "RETAIL" "Adaptec RAID Storport Driver" = "RETAIL" "Agilent HHBA-510x PCI Fibre Channel Controller" = "RETAIL" "Compaq Drive Array" = "RETAIL" I'll probably test that out later tonight and post my results.