RIS - SCSI Treiber hinzufügen danach cannot find a CD-ROM drive

Ich habe die Aufgabe erhalten einen RIS - Server für verschiedene Server mit unterschiedlicher Hardware zu installieren. In meinem speziellen Fall soll keine weitere Software installiert werden, "nur" Windows 2003 Standard oder Enterprise Edition.

Mittlerweile habe ich es auch schon geschafft, verschiedene SCSI-Raid-Controller einzubinden. Leider habe ich aber folgendes Problem:
Um die Treiber einzubinden habe ich gelesen, dass man den Parameter OemPreinstall=Yes im Unattended Bereich setzen muss. Wenn ich diesen Parameter in meine ristndrd.sif bringe und eine Remote Installation starte, bekomme ich nach dem Start von Windows die Meldung "Setup cannot find a CD-ROM drive". Wenn ich diesen Parameter auf No stelle (und die Installation auf einem Rechner ohne SCSI-Controller durchführe) kommt die Meldung: "Insert the CD labeled: Windows Server 2003, Standard Edition CD-ROM...". Beide Meldungen kommen zum gleichen Zeitpunkt: kurz bevor die HDD formatiert werden soll.
Wenn ich den Parameter nicht setze läuft die Installation auf einem Rechner ohne SCSI-Controller durch.

Hier mein ristndrd.sif:

[data]
floppyless = "1"
msdosinitiated = "1"
OriSrc = "\\%SERVERNAME%\RemInst\%INSTALLPATH%\%MACHINETYPE%"
OriTyp = "4"
LocalSourceOnCD = 1
DisableAdminAccountOnDomainJoin = 1
Autopartition = 0

[SetupData]
OsLoadOptions = "/noguiboot /fastdetect"
SetupSourceDevice = "\Device\LanmanRedirector\%SERVERNAME%\RemInst\%INSTALLPATH%"

[Unattended]
FileSystem = LeaveAlone
Repartition = no
ExtendOEMPartition = 0
ConfirmHardware = no
TargetPath = \WINDOWS
OemSkipEula = yes
InstallFilesPath = "\\%SERVERNAME%\RemInst\%INSTALLPATH%\%MACHINETYPE%"
DriverSigningPolicy=Ignore
OverwriteOemFilesOnUpgrade = yes
UnattendSwitch=yes
OemPreinstall=No
OemPnPDriversPath="\Drv\ca;\Drv\cb;\Drv\cc;\Drv\cd;\Drv\ce;\Drv\cf;\Drv\cg;\Drv\ch;\Drv\ci;\Drv\cj;\Drv\ck;\Drv\cm;\Drv\cn;\Drv\co;\Drv\cp;\Drv\cq;\Drv\cr;\Drv\cs;\Drv\ct;\Drv\3a;\Drv\3b;\Drv\3c"

[MassStorageDrivers]
"Adaptec HostRAID U320 Driver Ver 1.02 For Windows 2000/XP/2003"=OEM
"Adaptec Ultra320 SCSI Cards (Win XP/Server 2003 IA-32)"=OEM

[OEMBootFiles]
"Adaptec HostRAID U320 Driver Ver 1.02 For Windows 2000/XP/2003"
"Adaptec Ultra320 SCSI Cards (Win XP/Server 2003 IA-32)"
a320raid.cat
a320raid.inf
a320raid.sys
adhraid.cat
adhraid.inf
adpu320.sys
adpu320.inf
adpu320.cat
txtsetup.oem

[UserData]
ProductKey = XXXXX-XXXXX-XXXXX-XXXXX
FullName="Firma"
OrgName="Abteilung"
ComputerName = %MACHINENAME%

[GuiUnattended]
OemSkipWelcome = 1
OemSkipRegional = 1
TimeZone = %TIMEZONE%
AdminPassword = "*"

[LicenseFilePrintData]
AutoMode = PerSeat

[Display]
BitsPerPel = 16
XResolution = 800
YResolution = 600
VRefresh = 60

[Networking]

[NetServices]
MS_Server=params.MS_PSched

[Identification]
JoinDomain = %MACHINEDOMAIN%
DoOldStyleDomainJoin = Yes

[RemoteInstall]
Repartition = No
UseWholeDisk = Yes

[OSChooser]
Description ="Windows Server 2003, Standard"
Help ="Automatically installs Windows Server 2003, Standard without prompting the user for input."
LaunchFile = "%INSTALLPATH%\%MACHINETYPE%\templates\startrom.com"
ImageType =Flat
Version="5.2 (3790)"

[Disks]
d1 = "Adaptec HostRAID U320 Driver Ver 1.02 For Windows 2000/XP/2003", \hraidsk1, \
d2 = "Adaptec Ultra320 Family Manager Set - Microsoft Disk", \u320dsk1, \

[Defaults]
scsi = a79xxNTIA32

[scsi]
ADAPTEC_U320RAID_W2K = "Adaptec HostRAID U320 Driver Ver 1.02 For Windows 2000/XP/2003"
a79xxNTIA32 = "Adaptec Ultra320 SCSI Cards (Win XP/Server 2003 IA-32)"

[Files.scsi.ADAPTEC_U320RAID_W2K]
driver = d1,a320raid.sys, a320raid
inf = d1,a320raid.inf
inf = d1,adhraid.inf
catalog = d1,a320raid.cat
catalog = d1,adhraid.cat

[Config.scsi.ADAPTEC_U320RAID_W2K]
value = "", Group, REG_SZ, "SCSI Miniport"
value = "", Start, REG_DWORD, 0
value = "", Tag, REG_DWORD, 1
value = "", Type, REG_DWORD, 1
;value = "Parameters\Device","DriverParameter",REG_SZ,"MAXLUNS=8 HSREnabled=FALSE"

[Config.a320raid]
value = "", Group, REG_SZ, "SCSI Miniport"
value = "", Start, REG_DWORD, 0
value = "", Tag, REG_DWORD, 1
value = "", Type, REG_DWORD, 1
value = "Parameters\Device","DriverParameter",REG_SZ,"MAXLUNS=8 HSREnabled=FALSE"

;[HardwareIds.scsi.ADAPTEC_U320RAID_W2K]
;id = "PCI\VEN_9005&DEV_00c4","ADAPTEC_U320RAID_W2K"
;id = "PCI\VEN_9005&DEV_8011","ADAPTEC_U320RAID_W2K"

[Files.scsi.a79xxNTIA32]
driver = d2, adpu320.sys, adpu320
inf = d2, adpu320.inf
catalog = d2, adpu320.cat

[Config.adpu320]
value = "", tag, REG_DWORD, 20
#value = Parameters\PnpInterface,5, REG_DWORD,1

[HardwareIds.scsi.a79xxNTIA32]
id = "PCI\VEN_9005&DEV_801D", "adpu320"
id = "PCI\VEN_9005&DEV_801E", "adpu320"
id = "PCI\VEN_9005&DEV_801F", "adpu320"
id = "PCI\VEN_9005&DEV_800F", "adpu320"
id = "PCI\VEN_9005&DEV_800F&SUBSYS_005F9005", "adpu320"
id = "PCI\VEN_9005&DEV_8000&SUBSYS_00609005", "adpu320"
id = "PCI\VEN_9005&DEV_8010&SUBSYS_00409005", "adpu320"
id = "PCI\VEN_9005&DEV_8011&SUBSYS_00419005", "adpu320"
id = "PCI\VEN_9005&DEV_8012&SUBSYS_00429005", "adpu320"
id = "PCI\VEN_9005&DEV_8014&SUBSYS_00449005", "adpu320"
id = "PCI\VEN_9005&DEV_8015&SUBSYS_00409005", "adpu320"
id = "PCI\VEN_9005&DEV_8016&SUBSYS_00409005", "adpu320"
id = "PCI\VEN_9005&DEV_8017&SUBSYS_00449005", "adpu320"


Hier meine Filestruktur:

E:\RemoteInstall\Setup\English\Images\W2k3Std\

E:\RemoteInstall\Setup\English\Images\W2k3Std\$oem$\
E:\RemoteInstall\Setup\English\Images\W2k3Std\$oem$\$1\
E:\RemoteInstall\Setup\English\Images\W2k3Std\$oem$\$1\Drv\
E:\RemoteInstall\Setup\English\Images\W2k3Std\$oem$\$1\Drv\3a\
E:\RemoteInstall\Setup\English\Images\W2k3Std\$oem$\$1\Drv\3b\
E:\RemoteInstall\Setup\English\Images\W2k3Std\$oem$\$1\Drv\3c\
E:\RemoteInstall\Setup\English\Images\W2k3Std\$oem$\$1\Drv\CA\ usw...

E:\RemoteInstall\Setup\English\Images\W2k3Std\$oem$\$textmode\
hier liegen alle inf, cat und sys Dateien der einzelnen Geräte
und die txtsetup.oem, zusammenkopiert von allen Treibern.

E:\RemoteInstall\Setup\English\Images\W2k3Std\i386\
E:\RemoteInstall\Setup\English\Images\W2k3Std\i386\template\ristndrd.sif


Ich würde mich sehr freuen, wenn mir jemand helfen könnte dieses Problem zu lösen...