I'm having the same problem: BSOD on iastor55.sy_ also using UBCD4Win, with MassStorage 9.01, built from WinXP Retail slipstreamed with SP2.  My system is different, so I'm wondering if the solution should be the same for me.

If so, could you explain what you mean by "removing the L1 folder along with the L1 section of the INI file."

Thanks!

=========== 
PCI Devices 
=========== 
PCI\VEN_1002&DEV_4E48&SUBSYS_4F721002&REV_00\4&B7EB302&0&0008: ALL-IN-WONDER 9800 (Microsoft Corporation) 
PCI\VEN_1002&DEV_4E68&SUBSYS_4F731002&REV_00\4&B7EB302&0&0108: ALL-IN-WONDER 9800 (Microsoft Corporation)  
PCI\VEN_104C&DEV_8024&SUBSYS_1014147B&REV_00\4&1F7DBC9F&0&10F0: Texas Instruments OHCI Compliant IEEE 1394 Host Controller
PCI\VEN_1095&DEV_3112&SUBSYS_61121095&REV_02\4&1F7DBC9F&0&18F0: Silicon Image SiI 3112 SATARaid Controller
PCI\VEN_1102&DEV_0004&SUBSYS_10021102&REV_04\4&1F7DBC9F&0&30F0: Multimedia Audio Controller
PCI\VEN_1102&DEV_4001&SUBSYS_00101102&REV_04\4&1F7DBC9F&0&32F0: OHCI Compliant IEEE 1394 Host Controller
PCI\VEN_1102&DEV_7003&SUBSYS_00601102&REV_04\4&1F7DBC9F&0&31F0: PCI Input Device
PCI\VEN_14F1&DEV_5B7A&SUBSYS_74440070&REV_00\4&1F7DBC9F&0&20F0: Multimedia Video Controller
PCI\VEN_8086&DEV_1019&SUBSYS_1014147B&REV_00\4&2D894BD&0&0818: Intel(R) PRO/1000 CT Network Connection
PCI\VEN_8086&DEV_244E&SUBSYS_00000000&REV_C2\3&13C0B0C5&0&F0: Intel(R) 82801 PCI Bridge - 244E
PCI\VEN_8086&DEV_24D0&SUBSYS_00000000&REV_02\3&13C0B0C5&0&F8: Intel(R) 82801EB LPC Interface Controller - 24D0
PCI\VEN_8086&DEV_24D2&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&E8: Intel(R) 82801EB USB Universal Host Controller - 24D2
PCI\VEN_8086&DEV_24D3&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&FB: Intel(R) 82801EB SMBus Controller - 24D3
PCI\VEN_8086&DEV_24D4&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&E9: Intel(R) 82801EB USB Universal Host Controller - 24D4
PCI\VEN_8086&DEV_24D7&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&EA: Intel(R) 82801EB USB Universal Host Controller - 24D7
PCI\VEN_8086&DEV_24DB&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&F9: Intel(R) 82801EB Ultra ATA Storage Controllers
PCI\VEN_8086&DEV_24DD&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&EF: Intel(R) 82801EB USB2 Enhanced Host Controller - 24DD
PCI\VEN_8086&DEV_24DE&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&EB: Intel(R) 82801EB USB Universal Host Controller - 24DE
PCI\VEN_8086&DEV_24DF&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&FA: Intel(R) 82801ER SATA RAID Controller
PCI\VEN_8086&DEV_2578&SUBSYS_00000000&REV_02\3&13C0B0C5&0&00: Intel(R) 82875P/E7210 Memory Controller Hub - 2578
PCI\VEN_8086&DEV_2579&SUBSYS_00000000&REV_02\3&13C0B0C5&0&08: Intel(R) 82875P Processor to AGP Controller - 2579
PCI\VEN_8086&DEV_257B&SUBSYS_00000000&REV_02\3&13C0B0C5&0&18: Intel(R) 82875P/E7210 Processor to PCI to CSA bridge - 257B
22 matching device(s) found.
 
=========== 
USB Devices 
=========== 
USB\ROOT_HUB\4&1B9E36B3&0                                   : USB Root Hub
USB\ROOT_HUB\4&2B359713&0                                   : USB Root Hub
USB\ROOT_HUB\4&2EAD631B&0                                   : USB Root Hub
USB\ROOT_HUB\4&33BCD7D1&0                                   : USB Root Hub
USB\ROOT_HUB20\4&1E02278B&0                                 : USB Root Hub
USB\VID_0451&PID_1446\5&1C37D89E&0&2                        : General Purpose USB Hub
USB\VID_046D&PID_C01E\6&1EADEAC8&0&3                        : USB Human Interface Device
USB\VID_054C&PID_002C\5&1C37D89E&0&1                        : Sony USB Floppy
USB\VID_11B0&PID_6787\075226660911                          : USB Mass Storage Device
USBSTOR\DISK&VEN_AFT_PRO&PROD_-IX_CF&REV_0.0>\075226660911&0: AFT PRO -IX CF USB Device
USBSTOR\DISK&VEN_AFT_PRO&PROD_-IX_MS&REV_0.0>\075226660911&3: AFT PRO -IX MS USB Device
USBSTOR\DISK&VEN_AFT_PRO&PROD_-IX_SD&REV_0.0>\075226660911&1: AFT PRO -IX SD USB Device
USBSTOR\DISK&VEN_AFT_PRO&PROD_-IX_SM/XD&REV_0.0>\075226660911&2: AFT PRO -IX SM/XD USB Device
USBSTOR\SFLOPPY&VEN_SONY&PROD_USB-FDU&REV_6.01\6&2DAFD06C&0 : SONY USB-FDU USB Device
14 matching device(s) found.
 
============= 
Input Devices 
============= 
HID\VID_046D&PID_C01E\7&37D426DD&0&0000                     : HID-compliant mouse
1 matching device(s) found.
 
============ 
ACPI Devices 
============ 
ACPI\FIXEDBUTTON\2&DABA3FF&0                                : ACPI Fixed Feature Button
ACPI\GENUINEINTEL_-_X86_FAMILY_15_MODEL_2\_0                : Intel(R) Pentium(R) 4 CPU 2.40GHz
ACPI\INT0800\4&26DD0F47&0                                   : Intel(R) 82802 Firmware Hub Device
ACPI\PNP0000\4&26DD0F47&0                                   : Programmable interrupt controller
ACPI\PNP0100\4&26DD0F47&0                                   : System timer
ACPI\PNP0200\4&26DD0F47&0                                   : Direct memory access controller
ACPI\PNP0303\4&26DD0F47&0                                   : Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
ACPI\PNP0800\4&26DD0F47&0                                   : System speaker
ACPI\PNP0A03\1                                              : PCI bus
ACPI\PNP0B00\4&26DD0F47&0                                   : System CMOS/real time clock
ACPI\PNP0C01\2&DABA3FF&0                                    : System board
ACPI\PNP0C02\1                                              : Motherboard resources
ACPI\PNP0C02\2                                              : Motherboard resources
ACPI\PNP0C04\4&26DD0F47&0                                   : Numeric data processor
ACPI\PNP0C0B\2&DABA3FF&0                                    : ACPI Fan
ACPI\PNP0C0C\2&DABA3FF&0                                    : ACPI Power Button
ACPI\THERMALZONE\THRM                                       : ACPI Thermal Zone
ACPI_HAL\PNP0C08\0                                          : Microsoft ACPI-Compliant System
ROOT\ACPI_HAL\0000                                          : ACPI Uniprocessor PC
19 matching device(s) found.
 
============ 
 HDA Audio 
============ 
No matching devices found.
 
============ 
RAID Devices 
============ 
IDE\DISKRAID_VOLUME11.0.00_U\4&16B4800C&0&0.0.0
    Name: RAID_Volume1
    Hardware ID's:
        IDE\DiskRAID_Volume11.0.00_U
        IDE\RAID_Volume11.0.00_U
        IDE\DiskRAID_Volume1
        RAID_Volume11.0.00_U
        GenDisk
    Compatible ID's:
        GenDisk
PCI\VEN_1095&DEV_3112&SUBSYS_61121095&REV_02\4&1F7DBC9F&0&18F0
    Name: Silicon Image SiI 3112 SATARaid Controller
    Hardware ID's:
        PCI\VEN_1095&DEV_3112&SUBSYS_61121095&REV_02
        PCI\VEN_1095&DEV_3112&SUBSYS_61121095
        PCI\VEN_1095&DEV_3112&CC_010400
        PCI\VEN_1095&DEV_3112&CC_0104
    Compatible ID's:
        PCI\VEN_1095&DEV_3112&REV_02
        PCI\VEN_1095&DEV_3112
        PCI\VEN_1095&CC_010400
        PCI\VEN_1095&CC_0104
        PCI\VEN_1095
        PCI\CC_010400
        PCI\CC_0104
PCI\VEN_8086&DEV_24DB&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&F9
    Name: Intel(R) 82801EB Ultra ATA Storage Controllers
    Hardware ID's:
        PCI\VEN_8086&DEV_24DB&SUBSYS_1014147B&REV_02
        PCI\VEN_8086&DEV_24DB&SUBSYS_1014147B
        PCI\VEN_8086&DEV_24DB&CC_01018A
        PCI\VEN_8086&DEV_24DB&CC_0101
    Compatible ID's:
        PCI\VEN_8086&DEV_24DB&REV_02
        PCI\VEN_8086&DEV_24DB
        PCI\VEN_8086&CC_01018A
        PCI\VEN_8086&CC_0101
        PCI\VEN_8086
        PCI\CC_01018A
        PCI\CC_0101
PCI\VEN_8086&DEV_24DF&SUBSYS_1014147B&REV_02\3&13C0B0C5&0&FA
    Name: Intel(R) 82801ER SATA RAID Controller
    Hardware ID's:
        PCI\VEN_8086&DEV_24DF&SUBSYS_1014147B&REV_02
        PCI\VEN_8086&DEV_24DF&SUBSYS_1014147B
        PCI\VEN_8086&DEV_24DF&CC_01048F
        PCI\VEN_8086&DEV_24DF&CC_0104
    Compatible ID's:
        PCI\VEN_8086&DEV_24DF&REV_02
        PCI\VEN_8086&DEV_24DF
        PCI\VEN_8086&CC_01048F
        PCI\VEN_8086&CC_0104
        PCI\VEN_8086
        PCI\CC_01048F
        PCI\CC_0104
4 matching device(s) found.