[MassStorageDrivers]
This section contains a list of SCSI drivers to be loaded by the Setup Loader and installed during text-mode Setup. If this section is missing or empty, Setup attempts to detect the SCSI devices on the computer and install the corresponding retail drivers.

<mass storage driver description>
Value: Retail | OEM
Identifies the driver to be installed. It must match one of the strings defined in the right-hand side of the [SCSI] section of Txtsetup.sif (for a retail driver) or Txtsetup.oem (for an OEM driver). Multiple instances of <mass storage driver description> may be specified.

where:
• Retail indicates that the driver is part of the retail Windows 2000 product.
• OEM indicates that the driver is OEM-supplied. If the value is OEM, the driver must also be listed in the [OEMBootFiles] section of the Unattend.txt file.


[OEMBootFiles]

Specifies OEM-supplied boot files. This parameter is only valid if OemPreinstall = Yes and the files listed here have been placed in the \$OEM$\Textmode folder of the OEM’s distribution share point.
Note The parameters of this key are necessary if you are using ComputerType (under [Unattended]) and/or [MassStorageDrivers].

<HAL file name>
Maps to a HAL description that has been defined by the ComputerType key in the [Unattended] section of the Unattend.txt file.

<SCSI driver file name>
Maps to a mass storage device driver description defined in the [MassStorageDriver] section of the Unattend.txt file. There may be multiple instances of <SCSI driver file name> listed in the [OEMBootFiles] section.

Txtsetup.oem
This file contains descriptions of all the OEM-supplied drivers listed in this section and includes instructions on how to install them. This file must exist if this section is listed.

7.2 Use one of the following command examples to extract the driver files from the different package types:
c:\iata_cd.exe -a -a -p c:\<path>
c:\iata_enu.exe -a -a -p c:\<path>
c:\setup.exe -a -p c:\<path>

7.3 To install the RAID driver, as outlined in the Microsoft document 'Deployment Guide Automating Windows NT Setup', use the supplied TXTSETUP.OEM file included in this package and insert the lines shown in step 7.3a and 7.3b below into the UNATTEND.TXT file. This method is available for Microsoft* Windows* XP, Windows 2000, and Windows Server 2003.

7.3a Systems Configured for RAID Mode:

// Insert the lines below into the UNATTEND.TXT file

[MassStorageDrivers]
"Intel® 82801GR SATA RAID Controller" = OEM

[OEMBootFiles]
iaStor.inf
iaStor.sys
iaStor.cat
Txtsetup.oem

7.3b Systems Configured for AHCI Mode:

// Insert the lines below into the UNATTEND.TXT file

[MassStorageDrivers]
"Intel® 82801GR SATA AHCI Controller" = OEM

[OEMBootFiles]
iaAhci.inf
iaStor.sys
iaAhci.cat
Txtsetup.oem

HFSLIP documentation says it's not possible but I've found the following references below, so I'm a bit confused... does it really work?